• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    method and apparatus for controlling a frequency converter. the present invention relates to an apparatus and the method for controlling a frequency converter. first, the sub-synchronous components in the electrical network are identified using voltage measurements from the electrical network. the sub-synchronous components of the electrical network are then used to determine the set points for the damping currents. these damping currents are then added to the current set points, calculated by the power regulation circuits to generate the total current set points. subsequently, the frequency converter is controlled based on the total current set points.
    公开号:BR112014016351B1
    申请号:R112014016351-0
    申请日:2012-12-17
    公开日:2020-09-08
    发明作者:Eneko OLEA；Josu Ruiz；Josu Elorriaga；Sergio AURTENETXEA；Ainhoa Carcar；Beatriz GIL
    申请人:Ingeteam Power Technology, S.A.；
    IPC主号:
    专利说明:

    [0001] [0001] This patent application claimed priority from Provisional U.S. Patent Application No. 61 / 583,449 filed on January 5, 2012 with the United States Patent and Trademark Office, the description of which is incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION Field of the Invention
    [0002] [0002] Apparatus and methods consistent with the present invention refer to a frequency converter used in a wind turbine generator. Description of the Related Art
    [0003] [0003] Electric networks are part of an energy generating system and have the necessary components to transfer the electrical energy generated by the energy generating units over great distances to the points of energy consumption. Most of the electrical networks currently installed conduct energy such as alternating current and voltage. It is worth mentioning that the number of electrical networks conducting energy such as direct voltage and current (DC) has been growing due to the advantages they offer in terms of energy efficiency in long distance networks. This has been possible due to the progress in conversion systems based on energy electronics, which allows interconnecting the two types of networks, alternating electrical networks and continuous electrical networks, using HVCD (Direct High Voltage Current) and conversion structures. HVAC (High Voltage Alternating Current).
    [0004] [0004] Similarly, the progress felt in energy electronics favors a change towards a distributed generation structure and far from the basic generation structure used until today, which was based mainly on large hydraulic and thermal or nuclear power stations. . One of the main elements of the growing structure of distributed generation is wind energy, which in the last decade has achieved great growth through the new wind power generating facilities. Wind power generation is based on energy electronics, since most generators used to convert mechanical wind energy into electrical energy injected into the grid are controlled by the conversion structures based on energy electronics, especially the components known as converters frequency.
    [0005] [0005] The frequency converters are controlled from the control units that carry out the control based mainly on the information captured using current and voltage transducers and executing the control algorithms to control the energy flow between the two systems. electrical. There are different types of electrical systems, such as electrical networks or electrical machines and the flow of energy can be bidirectional. For example, if the energy is consumed from the electrical network in order to be transformed into mechanical energy on the axis of an electrical machine, the application will correspond to a motor application (for example, pumping or ventilation applications). On the other hand, if the energy is extracted from an electrical machine and injected into the electrical network, the application will correspond to a generation application (for example, wind generation applications, where the primary source of energy is the wind, which turns the axis of the electric machine).
    [0006] [0006] Alternating electrical networks consist mainly of cables (physical medium through which energy flows) and voltage transformers (components that allow adapting voltage levels between different connection points). Both components, cables and transformers, are components that have a mainly inductive nature, and therefore provide inductive impedance for the alternating current that circulates through them. Depending on the characteristics of each electrical network, the existing inductive impedance will vary, the length of the cables in the network being an important parameter to consider when quantifying the value of the inductive impedance (the greater the length, the greater the inductance of the network and therefore, the greater the inductive impedance). The existence of high inductive impedance in an electrical network will mean a greater loss in its transmission capacity. This phenomenon happens due to the voltage drop that occurs in the inductive impedance of the cable when the current circulates through it and this can become important in certain cases that combine factors, such as long cable lengths and high energy consumption (high circulation of current through the mains).
    [0007] [0007] In the related technique, there are some solutions to the aforementioned problem of a loss of transmission capacity in electrical networks that have a high inductive impedance. One of the commonly applied solutions is based on the compensation of highly inductive electrical networks through the insertion of capacitive components (capacitors) in series. This works to compensate for the electrical network's own inductive impedance by inserting capacitive impedance in series, which results in a reduction in the total equivalent impedance. This technique minimizes the problem of voltage drops in the electrical network and, therefore, contributes to maintaining its power transmission capacity.
    [0008] [0008] The insertion of capacitors in series in highly inductive electrical networks is effective when the problem of loss of transmission capacity of a network is solved, but on the other hand, it results in problematic effects when considered from the point of view of stability compensated power grid. Specifically, the insertion of capacitors in series in an inductive network results in the equivalent circuit of that network having the natural resonance frequency according to the formula described by: Equation (1)
    [0009] [0009] In which: ƒR- Compensated network natural resonance frequency ƒ0 - Main network frequency xc - Capacitive impedance of the series capacitor inserted in the mains Xl - Inductive impedance of the mains
    [0010] [00010] Figure 2 shows a single line wiring diagram for a compensated electrical network with capacitors in series. The different components that make up the electricity grid are: the central power generation unit 13 shown in the figure as a wind farm; the equivalent inductance 14 of the transmission lines or mains cables; capacitors introduced in series into the electrical network to compensate for the equivalent inductance of the electrical network; and the collectors 15 present in the electrical network that connect the transmission lines from different points.
    [0011] [00011] Depending on the degree of compensation applied to the electrical network (percentage of capacitive impedance as capacitors in series in relation to the electrical network's own inductive impedance), the resulting value of the resonant frequency of the electrical network will vary. The proportion of capacitive and inductive impedances commonly applied to the compensation net generally results in lower resonant frequency values than the base frequency of the network. The technical literature uses the term SSI (Subsynchronous Interactions) to describe the condition of an electrical network that has these characteristics.
    [0012] [00012] Networks with sub-synchronous resonance are potentially dangerous networks to integrate the generation components that are based on generation turbines with rotating axes that have a low frequency mechanical oscillation. This is the case of synchronous generators with long axes (typical example of generation plants) in which the mass distribution along the axis, which in turn rotates according to the action of a primary source of torque (steam, water, etc.). ), commonly present mechanical oscillation modes with lower frequencies than the base frequency of the electrical network to which they are connected. In the event that the network connected to a generator with the characteristics mentioned above is compensated with a specific value of capacitors in series that make up the subsynchronous frequency, natural resonant coincide with the oscillation frequency of the mechanical axis, negative effects can be induced on the axis , since the amplitude of the mechanical oscillation of the axis could be amplified with a negative damping (that is, an amplitude oscillation that grows over time). This effect could result in a failure of the shaft generator. This case corresponds to a specific problem for the natural interaction between the two parts of a power system, the electrical network being adjusted according to the capacitors and the generator, where the mechanical mass of a synchronous generator resonates with the subsynchronous frequency of the impedance. network equivalent of the power grid. This phenomenon is known in the technical literature as SSR (Subsynchronous Resonance).
    [0013] [00013] In addition to the possibility that the natural resonance frequency of the electrical compensated network coincides with the resonant, mechanical and natural frequency of generators that inject energy into that network, the increasing presence of frequency converters connected to the network adds a new aspect to be considered from the point of view of network stability. This is the interaction of the frequency converter control with the compensated networks, a phenomenon that can cause the loss of control of the energy flow through the converter, which can destabilize the electrical network itself. This phenomenon is known in the literature as SSCI (Subsynchronous Control Instability).
    [0014] [00014] The SSCI phenomenon occurs when the control of frequency converters connected to compensated networks that have capacitors in series makes the converters behave like electrical systems whose equivalent resistance acquires negative values within a frequency range lower than the base frequency network . The SSCI phenomenon can have similar effects to the SSR phenomenon, however, to achieve this there must be a high number of frequency converters connected to the compensated networks. The increasing use of frequency converters connected to the grid, together with the existence of compensated electrical networks with capacitors in series, has made this potentially dangerous scenario a reality, for which a solution is desired and which constitutes the basis for the invention described here. SUMMARY OF THE INVENTION
    [0015] [00015] The aspects of the invention refer to a method for the control of a frequency converter connected to the electrical network, characterized by the fact that it contributes to the damping of the sub-synchronous resonance that can occur in the electrical network. The control method is based on reading the voltage from the network to which the frequency converter is connected. Voltage readings are used to identify the resonant frequencies in the network and are also used within the frequency converter's regulation circuits in order to establish the current setpoints that the converter must regulate to dampen the sub-synchronous resonance in the electrical network. .
    [0016] [00016] The control method proposed here can be implemented in existing systems, since ekle is an improvement that can be applied to the software operated in the control unit that controls the converter and that could, therefore, be applied through updating the control program used in the central control unit. BRIEF DESCRIPTION OF THE DRAWINGS
    [0017] [00017] The above aspects and characteristics and other various aspects of the present invention will become more apparent through the detailed description of their exemplary modalities with reference to the attached drawings, in which:
    [0018] [00018] Figure 1 shows a single-line wiring diagram for a wind power application based on a double power topology.
    [0019] [00019] Figure 2 shows a single line wiring diagram for a compensated electrical network with capacitors in series.
    [0020] [00020] Figure 3 shows a block diagram representing the active power regulation circuit (17) and the reactive power regulation circuit (27).
    [0021] [00021] Figure 4 shows a block diagram representing the modified active power and the reactive power regulation circuits that integrate a sub-synchronous resonance damping circuit (39).
    [0022] [00022] Figure 5 shows a block diagram depicting a subsynchronous resonance damping circuit (39).
    [0023] [00023] Figure 6 shows the results of a simulation of a wind power generation software based on a double power topology controlled by a frequency converter whose operation is regulated by the regulation algorithms defined in Figure 3.
    [0024] [00024] Figure 7 shows the results of a simulation of a wind power generation software based on a double power topology controlled by a frequency converter whose operation is regulated by the regulation algorithm defined in Figure 4.
    [0025] [00025] Figure 7a shows a system that includes a network sub-synchronous resonance damping circuit based on the power set points 50.
    [0026] [00026] Figure 7b shows a subsynchronous resonance damping circuit, based on the power set points 50.
    [0027] [00027] Figure 8 is the diagram illustrating a system to which the modalities of the present invention can be applied.
    [0028] [00028] Figure 9 is a flow chart showing a method according to an embodiment of the present invention. DETAILED DESCRIPTION OF EXEMPLARY MODALITIES
    [0029] [00029] The detailed description of the various aspects of the invention will be developed based on an application of power generation with double feed topology. A person skilled in the art could understand that the invention described here is applicable to any application that includes at least one frequency converter connected to the network. As proof of what has been said above, examples such as applications in the generation or consumption of energy can be cited, in which all the energy flows through the frequency converter (complete converter), HVCD applications for energy distribution or HVAC applications for energy distribution.
    [0030] [00030] The double supply topology consists of an asynchronous double supply generator, in which the stator terminals are connected directly to the mains and in which the rotor terminals are connected to a frequency converter which in turn is connected to the electrical network.
    [0031] [00031] Figure 1 shows a single-line wiring diagram for a wind power application based on a double power topology. The diagram shows the different parts that make up the application, which includes the head transformer that adapts the supply voltage, the asynchronous generator 1 of the bearing rotor, the frequency converter 4 consisting of the inverter 6 and the rectifier 5, the circuit bypass protection 13, the grid connection filter 8 and the generator connection filter 7, the central control unit 10, the contactor for connection to a generator in the network 2 and the contactor 9 for connecting the rectifier 5 to the network .
    [0032] [00032] More specifically, Figure 1 shows a system that includes a double feed asynchronous generator 1, the stator of which is connected to the mains via the stator coupling contactor 2 and a transformer 3. Transformer 3 adapts the output of the stator voltage to the mains voltage level. The rotor of the double-powered synchronous generator 1 is connected to a frequency converter 4 consisting of a grid converter or rectifier 5 and a machine converter or inverter 6. The system also includes a generator connection filter 7 between the inverter 6 and the rotor, as well as a grid connection filter 8 connected between the rectifier 5 and the connection contactor 9 to connect the rectifier to the mains.
    [0033] [00033] The system also includes a central control unit 10 that executes the control algorithms from measurements made in the system, in order to generate the switching commands 11 of the rectifier's static switches and to generate switching commands 12 for the static inverter switches.
    [0034] [00034] In one embodiment, the inverter 6 and the rectifier 5 can include static switches of the IGBT type, having their opening and closing functions controlled by the switching commands of the central control unit 10.
    [0035] [00035] The grid connection filter 8 and the generator connection filter 7 can consist of passive components, such as inductances, capacitances and / or resistors. The main purpose of the network connection filter 8 is to filter the voltage and current waves to reduce the harmonic content of the energy that is injected into the network. The main purpose of the generator connection filter 7 is to moderate the derivatives of the voltage waves imposed by the inverter on the generator rotor coils.
    [0036] [00036] The assembly operation is monitored from the central control unit 10, which processes the measurements collected from sensors installed throughout the system. The central control unit 10 executes the programmed control algorithms in order to control the flow of energy between the generator and the grid. As a result of running these algorithms, switching commands 11 and 12 are generated for IGBTs installed on both rectifier 5 and inverter 6. These switching commands 11, 12 are calculated using the modulation steps that use pulse width modulation to synthesize from the voltages with continuous stage, the reference voltages that must be applied at the output of the inverter 6 and the rectifier 5 to control the currents in each of these components. Pulse width modulation methods are widely used in the current state of the art and can vary between scalar or vector methods. Scalar modulation methods are those based on the comparison of conductive signals with modulation signals (PWM, Pulse Width Modulation, for example). Vector methods are those that apply specific vectors or switching patterns at specific times, previously calculated in the modulation stages (SVPWM, Space Vector Pulse Width Modulation, for example).
    [0037] [00037] Figure 2 shows a single line diagram that represents, in a simplified way, a power distribution line that interconnects a wind generation plant 130 with a power collector 160 that is used to connect different power distribution lines. energy. Inductance 140 represents the inductive nature of the power distribution line connected to the wind power plant 130. The power distribution line that interconnects the wind power plant 130 and the power collector 160 is compensated by introducing a capacitor 150 arranged in series connection.
    [0038] [00038] Figure 3 shows that the control algorithms control a power regulation circuit (known as the external circuit) and a current regulation circuit (known as the internal circuit). As shown in Figure 3, the structure consisting of the two regulation circuits is equivalent to both active power 17 and reactive power 27. The active power regulation circuit 17 is based on the comparison of an active power setpoint 18 with the actual value of the active power measured in system 19. The error 20 resulting from the comparison will be processed by the active power regulator 21, which must provide a necessary setpoint of the active current output 22 to be regulated by the active current circuit subsequent. The active current regulation internal circuit must receive the active current setpoint 22 inserted in the output of the active power regulator 21 and will compare this value with the real value of the active current measured in the system 23. The error 24 that results from the The comparison between both current values will be processed by the active current regulator 25, which must provide the necessary setpoints 26 of the active output voltage to be introduced in the output converter using the static switch activator commands introduced by the modulation stage 100.
    [0039] [00039] Similar to what has been described for the active power regulation circuit, the operating principle for the reactive power circuit 27 is based on the comparison of a reactive power setpoint 28 that will be compared to the actual value of reactive power 29 measured in the system. The error 30 resulting from the comparison will be processed by the reactive power regulator 31 which will provide the required setpoint of the reactive current output 32 to be regulated by the subsequent reactive current circuit. The internal circuit for regulating the active current must receive the reactive current setpoint 32 inserted in the output of the reactive power regulator 31 and it will compare this value with the real value of the reactive current measured in the system 33. The error 34 that results from the comparison between both current values will be processed by the reactive current regulator 35, which must provide the necessary set points of the reactive voltage output 36 to be introduced in the output converter through the static switch activator commands, introduced by the stage modulation 100.
    [0040] [00040] The setpoints of the active voltage 26 and the reactive voltage 36 will be processed by the modulation stage 100, which must define the switching commands 11, 12 for the static switches of the converter.
    [0041] [00041] The present invention proposes the modification of the regulation algorithms described in Figure 3, completing them by the inclusion of a new network subsynchronous resonance damping circuit, based on current setpoints 39 (Figure 4) or a new networked sub-synchronous resonance damping circuit, based on the power set points 50 (Figure 7a). As shown in Figure 4, the sub-synchronous resonance damping circuit, based on the current set points 39, is based on the readings of the network voltages 38 which, once processed, will determine the necessary current set points to dampen the subsynchronous resonance of the network. As shown in Figure 7a, the sub-synchronous resonance damping circuit, based on the power set points 50, is based on the voltage readings of the network 38 which, once processed, will determine the necessary power set points to dampen the subsynchronous resonance of the network.
    [0042] [00042] As shown in Figure 5, a subsynchronous resonance damping circuit, based on the current setpoints 39 will process the voltage readings of the network 38 by applying mathematical operations such as the Clarke transformations 42 and the Park 43 transformations. The application of these two transformations provides a vector representation of the mains voltages. The vector representation of the mains voltages will be used by an identification block of the sub-synchronous component of the voltage 44 using filters that allow to differentiate the base frequency of the mains voltage from any other frequencies that may exist, that is, sub-synchronous frequencies. The settings on the filters used to identify the sub-synchronous components of the grid voltage will be predefined by the standard, in order to identify the sub-synchronous components of the voltage of any electrical network to which the frequency converter is connected without needing to know the corresponding sub-synchronous resonance theoretical value. this network, a value that could be identified if the natural impedance values of the electrical network were known. A person skilled in the art can determine the natural impedances of an electrical network if the components that make up that electrical network are known.
    [0043] [00043] The sub-synchronous components of the electric network, identified by a block of identification of the sub-synchronous resonance 44 must be used in the calculation block of the current damping set point 45, in order to generate the current set points of the current of the current damping that will be added to the current set points introduced by the active and reactive power circuits. The damping set points, calculated by the current damping setpoint calculation block 45, should be divided into active 40 and reactive 41 components.
    [0044] [00044] The damping active current set point 40 must be added to the active current set point 22 calculated by the active power regulator 21 and the result of this addition must correspond to the total active current 37 that the active current regulator 25 should regulate. Similarly, the reactive current setpoint of damping current 41 must be added to the reactive current setpoint 32 calculated by the reactive power regulator 31 and the result of this addition must correspond to the total reactive current that the reactive current regulator 35 should regulate.
    [0045] [00045] As shown in Figure 7b, the sub-synchronous resonance damping circuit, based on the power set points 50, will process the voltage readings of the network 38 through the application of mathematical operations such as the Clarke transformations 42 and the Park 43 transformations. The application of these two transformations provides a vector representation of the mains voltages. The voltage vector representation of the electrical network will be used by the identification block of the sub-synchronous component of voltage 44 using filters that allow to differentiate the base frequency of the electrical network from any other frequencies that may exist, that is, sub-synchronous frequencies. The settings on the filters used to identify the sub-synchronous components of the grid voltage will be predefined by the standard, in order to identify the sub-synchronous components of the voltage of any electrical network to which the frequency converter is connected without needing to know the corresponding sub-synchronous resonance theoretical value. this network, a value that could be identified if the natural impedance values of the electrical network were known. A person skilled in the art can determine the natural impedances of an electrical network if the components that make up that electrical network are known.
    [0046] [00046] The sub-synchronous components of the power grid, identified by the sub-synchronous resonance identification block 44 must be used in the calculation block of the power damping set point 55, in order to generate damping power set points that will be added to the power setpoints, to the active power setpoint 18, and to the reactive power setpoint 28. The damping setpoints calculated by the power damping setpoint calculation block 55 are to be divided into components assets 51 and reactive 53.
    [0047] [00047] The active damping power setpoint 51 must be added to the active power setpoint 18 and the result of this addition must correspond to the total active power 52 that the active power regulator 21 must regulate. Similarly , the damping reactive power set point 53 must be added to the reactive power set point 28 and the result of this addition must correspond to the total reactive power 54 that the reactive power regulator 31 must regulate.
    [0048] [00048] Figure 6 shows the results of a simulation of a wind power generation software based on a double power topology controlled by a frequency converter, whose operation is regulated by the regulation algorithms defined in Figure 3. The simulation shows the behavior of the system at the moment when the sub-synchronous resonance appears in the electrical network. The simulation shows the formats of the active power injected into the network 46, the reactive power injected into the network 47, the voltages of the R, S and T phases of the electrical network 48 and the currents of the R, S and T phases of the electrical network 49. Grid shapes allow to identify the effect of the sub-synchronous resonance on the network voltages of phases R, S and T. The effect of the sub-synchronous resonance of the network is that the control algorithms defined in Figure 3 cannot control the active and reactive powers and currents R, S and T in the system.
    [0049] [00049] Figure 7 shows the results of a simulation of a wind power generation software based on a double power topology controlled by a frequency converter whose operation is regulated by the regulation algorithm defined in Figure 4. The simulation shows the behavior of the system at the moment when the sub-synchronous resonance appears in the electrical network. The simulation shows the formats of the active power injected into the network 46, the reactive power injected into the network 47, the voltages of the R, S and T phases of the electrical network 48 and the currents of the R, S and T phases of the electrical network 49. network shapes shown in Figure 7 compared to the network shapes in Figure 6, allow to verify the improvement in the behavior of the system that operates with the control algorithms defined in Figure 4. The effect of the sub-synchronous resonance is dampened and the system maintains the control of all its variables.
    [0050] [00050] Figure 8 is a diagram illustrating a modality of the central control unit 10 described above. Referring to Figure 8, system 800 can be a common-purpose computer, a special-purpose computer, a personal computer, a server or the like. The 800 system can include an 810 processor, an 820 memory, an 830 storage unit, an 840 I / O interface, an 850 user interface, and an 860 bus. The 810 processor can be a central processing unit (CPU) , that is, a central control unit that controls the operation of the 800 system by transmitting control and / or data signals to the 860 bus that communicates the 810 to 850 elements of the 800 system with each other. The 860 bus can be a control bus, a data bus or the like. The 810 processor can be provided with instructions for deploying and controlling the operations of the 800 system, for example, in the form of computer-readable codes. Computer-readable codes can be stored in memory 820 or on storage unit 830. Alternatively, computer-readable codes can be received via the I / O interface 840 or the user interface 850. As discussed above, memory 820 may include RAM, ROM, EPROM, Flash memory or the like. As also discussed above, the storage unit 830 can include a hard drive (HD), solid state drive or the like. The storage unit 830 can store an operating system (OS) and application programs to be loaded into memory 820 so that the processor 810 can run them. The I / O 840 interface exchanges data between the system and other external devices, such as other systems or peripheral devices, directly or over a network, for example, a LAN, WAN or the Internet. The I / O 840 interface can include a universal serial bus (USB) port, a network interface card (NIC), port from the Institution of Electronics and Electrical Engineers (IEEE) 1394 and the like. The 850 user interface receives registration from a user and provides an exit for the user. The 850 user interface can include a mouse, keyboard, touchscreen or other input device to receive user records. The 850 user interface can also include a screen, such as a monitor or liquid crystal display (LCD), speakers and the like to provide output to the user.
    [0051] [00051] Figure 9 shows a flow chart that describes the method according to this modality. The flowchart represents an algorithm that can be executed in the system shown in the Figure. 8. In step 1, the sub-synchronous components that cause sub-synchronous resonance in an electrical network are identified. Based on the identified sub-synchronous components, the set points for the damping currents are determined (step 2). These current set points of the damping current are then added to the set points determined by the power regulation circuits in step 3. Finally, in step 4, the frequency converter is controlled based on the total set points of current that results from adding the current set points of the damping current to the power regulation set points.
    [0052] [00052] Although several characteristics have been described together with the examples outlined above, several alternatives, modifications, variations, and / or improvements in these characteristics and / or examples are possible. Consequently, the examples, as described above, are illustrative only. Several changes can be made without departing from the spirit and general scope of the underlying principles.
    [0053] [00053] The present invention has been described above with reference to the flowchart illustrations of user interfaces, methods and products with a computer program, according to the modalities of the invention. It will be understood that each block of flowchart illustrations and combinations of blocks in the flowchart illustrations can be implanted by computer program instructions. These computer program instructions can be provided on a common-purpose computer processor, special-purpose computer or other programmable data processing device to produce a machine, so that the instructions, which are executed through the processor computer or other programmable data processing device, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory that can direct a computer or other programmable data processing device to function in a particular way, so that the instructions stored in memory usable in computer or computer-readable produce a manufacturing article that includes means of instruction to implement the function specified in the flowchart block or blocks. Computer program instructions can also be loaded onto a computer or other programmable data processing device to have a series of operational steps performed on the computer or on another programmable device to produce a computer-implemented process, so that the instructions that are executed on the computer or other programmable device provide steps to implement the functions specified in the flowchart block or blocks.
    [0054] [00054] And each block of the flowchart illustrations can represent a module, a segment or a piece of code, which includes one or more executable instructions to implement the specified logical function (s). It should also be noted that in some alternative deployments, the functions observed in the blocks can occur out of order. For example, two blocks shown in succession can actually be executed substantially concurrently, or the blocks can sometimes be executed in reverse order, depending on the functionality involved.
    权利要求:
    Claims (11)
    [0001]
    Method for controlling a frequency converter connected to an electrical network, characterized by the fact that the method comprises: determine an active current setpoint (22) based on a measured active power output comparison (19) of an electrical generator (1) configured to be connected to the grid, with an active power setpoint (18) ; determining a reactive current setpoint (32) based on a comparison of measured reactive energy output (29) from the electric generator (1) with a reactive power setpoint (28); identify sub-synchronous components in the electrical network based on voltage measurements of the electrical network; determine active and reactive set points (40, 41) for damping currents using the sub-synchronous components of the electrical network that are identified based on voltage measurements of the electrical network; add the active and reactive set points (40, 41) for the damping currents respectively for active and reactive current set points (22, 32) calculated by energy regulation loops (17, 27), to generate total active and reactive current adjustment (37, 16), said total active and reactive current adjustment points (37, 16) with the total currents to be regulated by the current regulators (25, 35); and control the frequency converter based on the total active and reactive current set points (37, 16).
    [0002]
    Method for controlling a frequency converter according to claim 1, characterized by the fact that setpoints for damping currents (22, 32) are calculated from a setpoint of damping energy (51, 53 ).
    [0003]
    Method for controlling a frequency converter, according to claim 1, characterized by the fact that the identification of the sub-synchronous components of the network is carried out using filters that allow to differentiate the base frequency of the power network from the sub-synchronous frequencies.
    [0004]
    Method for controlling a frequency converter, according to claim 1, characterized by the fact that the set points (40, 41, 51, 53) for the damping currents are calculated using regulators (45; 55).
    [0005]
    Method for controlling a frequency converter, according to claim 4, characterized by the fact that the regulators (45; 55) used to calculate the set points (40, 41; 51, 53) for the damping currents they can be proportional regulators, proportional integrals or proportional integral derivatives.
    [0006]
    Electrical generator apparatus, the apparatus comprising: an electrical generator (1) configured to be connected to an electrical network; and a converter (4) comprising an inverter (6) connected to an electric generator rotor; characterized by the fact that the electrical generating apparatus additionally comprises a control unit (10) configured to control the converter (4) based on an active power setpoint (18) and a reactive power setpoint (28), the control unit (10) comprising: an active power control unit (21) that determines an active current setpoint (22) based on a comparison of the active power output measured (19) by the electrical generator (1) with an active power setpoint target (18); a reactive power control unit (31) that determines a reactive current setpoint (32) based on a comparison of reactive power output measured (29) by the electrical generator (1) with a target reactive power setpoint (28); and a subsynchronous resonance damping unit (39) which determines sub-synchronous components in the mains based on mains voltage measurements to determine damping set points (40, 41) for the damping currents, the damping set points (40, 41) comprising a current setpoint active damping (40) and a reactive damping current set point (41), where the controller (10) controls the converter (4) based on the active current set point (22), the reactive current set point (32) and the damping current set points (40, 41) , the active damping current set point (40) being added to the active current set point (22) calculated by the active energy regulator (21), and the reactive damping current set point (41) being added to the point reactive current adjustment (32) calculated by the reactive energy regulator (31).
    [0007]
    Electric generator apparatus according to claim 6, characterized by the fact that the sub-synchronous resonance damping unit (39) determines set points for damping currents (22, 32) based on damping energy set points (51 , 53).
    [0008]
    Electrical generating apparatus according to claim 6, characterized by the fact that the sub-synchronous resonance damping unit (39) comprises a filter configured to differentiate a base frequency of the electrical network from the sub-synchronous components of the electrical network.
    [0009]
    Electric generator apparatus according to claim 8, characterized in that the sub-synchronous resonance damping unit (39) comprises a regulator to determine the damping set points (40, 41) for the damping currents.
    [0010]
    Electric generator apparatus according to claim 8, characterized in that the subsynchronous resonance damping unit (39) comprises a calculation unit (45) for determining the damping energy set points (51, 53) , the damping current set points (40, 41).
    [0011]
    Electric generating apparatus according to claim 9, characterized by the fact that the regulators used to calculate the set points (40, 41; 51, 53) for damping currents can be proportional regulators, proportional integrals or proportional integral derivatives.
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    公开号 | 公开日 | 专利标题
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-06-16| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-09-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 17/12/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201261583449P| true| 2012-01-05|2012-01-05|
    US61/583,449|2012-01-05|
    US13/683,054|2012-11-21|
    US13/683,054|US9455633B2|2012-01-05|2012-11-21|Method and apparatus for controlling a frequency converter|
    PCT/IB2012/002978|WO2013102791A1|2012-01-05|2012-12-17|Method and apparatus for controlling a frequency converter|
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