• 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:

    公开号:SE1230080A1
    申请号:SE1230080
    申请日:2012-08-15
    公开日:2014-02-16
    发明作者:Claes Urban Lundin
    申请人:Claes Urban Lundin；
    IPC主号:
    专利说明:

    20 25 30 CONTROL SYSTEM IÉÖR SUPPORT REDUCTION IN HYDROPOWER STATIONS URBAN LUNDIN AUGUST 15, 2012 the stresses on the rotating system. This can be done by connecting an external load to the generator after the generator has been disconnected from the mains. The external load (hereinafter referred to as electrical load) prevents overheating of the turbine and you have more time to control the fate through the unit, which means that you can close the guide rails as slowly as required to avoid hydraulic transients without causing overheating of the rotating the system.
    Electric loads for speed control or to prevent overheating of especially steam turbines have been proposed in previous patents EP 0098047, WO 2009 / 038562. Similar ideas have also been seen in later patents DE 19839636, DE 10 2004 016450. In WO 2011/018404 the focus is on to reduce the closing time, because in the present application the focus is on being able to extend the closing time of the turbine in order to prevent problems caused by hydraulic transients in the waterways of a hydropower station.
    On the mains there is sometimes a device called braking resistor (in English: "braking resistor"). However, these are switched on for much shorter periods of time than the proposed device, and the purpose is to stabilize the electricity grid, the invention referred to in this document is installed on a hydropower station to protect the hydropower station.
    The described device can also be used for normal downtime when the generator is disconnected from the mains and the unit is to be stopped. By maintaining rotor magnetization and engaging the electrical load, a braking torque is obtained on the shaft which reduces the speed faster than the case when no electrical load is engaged.
    SUMMARY OF THE INVENTION The above-described problems are solved by the invention as defined in claims 1 and 7. An electrical load is connected to the terminals of the generator via an electrical switch. The electrical switch receives a signal from a 10 15 20 25 30 CONTROL SYSTEM LEARNING SUPERVISION REDUCTION IN HYDROPOWER STATIONS URBAN LUNDIN AUGUST 15, 2012 control system to close the electrical contact between generator and an electric load. The control system in turn responds to signals from generator switches, which connect the generator to a mains, as well as from the generator itself. When the control system detects a speed increase on the generator, which can also be detected by measuring the electrical frequency, and that the generator switch switches to the open position, a signal is sent to the electrical switch to switch on the electrical load.
    During a normal stop, the control system will activate the electrical switch to the closed position when the electrical output power is close to zero and the generator switch switches to the open position.
    BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically shows an embodiment of the invention.
    DETAILED DESCRIPTION OF THE INVENTION Figure 1 schematically illustrates the nature of the invention. A hydropower plant consisting of one or two turbines (1) connected to a generator (2). Via an electrical switch or power electronics (3), the electrical power is transmitted to distributed or located loads or the electrically interconnected mains (4). When an event is detected by a protection system installed in the station which activates the switch or the power electronics (3) so that the output electrical power to the mains (4) from the generator disappears, signals are sent to the control system (5). The signals consist of the position of the generator switch (3), as well as the output active power or speed obtained from the generator (2), but are not limited to these signals.
    The control system (5) is adapted to receive signals about the position of the generator switch and the speed of the generator.
    The load reduction indicated by (3) switching to the open position, and that either the speed increases on the rotating system or that the electrical output 10 15 20 25 30 CONTROL SYSTEM LEARNS SUPERVISION REDUCTION IN HYDROPOWER STATIONS URBAN LUNDIN AUGUST 15, 2012 it goes down close to zero, (5) to control circuit breakers or power electronics (6) (hereafter both realizations are called switches) to redirect the electrical power to the equipment (7) that is to take care of the electrical power. This equipment consists of either an electrical load or an energy storage that can receive electrical energy. In some devices there may also be a transformer between the generator (2) and the equipment that receives the electrical power (7). The device is designed so that the electrical switch (6) is located between the generator (2) and the switch (3) of the generator.
    The device (7) for handling the electric power may consist of an electric load, or storage system for energy such as flywheels, batteries, compressed air, but is not limited to these applications.
    The electric load is in an embodiment consisting of an electrical resistance which is made in a water bath.
    The electrical switch (6) consists of either a switch or power electronics that electrically connect the external electrical load.
    The system solution is arranged so that it can be used to electrically brake the rotating system even during normal downtime.
    The equipment described can also be used at other stopping times for turbine (1) and generator (2). At normal stops, or so-called quick-relief stops, when the generator output power is almost zero when the generator switch (3) disconnects the generator (2) from the surrounding mains (4), the control system (5) can request the electrical switch (6) to stop so that the electric load (7) receives electric power. Thus, the speed will decrease faster past critical speeds for the rotating system (consisting of turbine (1), shaft and generator (2)), thereby avoiding vibration problems in the hydropower station.
    In the case where the described system is used regularly during normal downtimes, the generated energy can be disposed of in the station or its surroundings, either for local power when the electrical load is arranged CONTROL SYSTEM LEARNS SUPERVISION REDUCTION IN HYDROPOWER STATIONS URBAN LUNDIN electric power system, for heating premises when the electric load is arranged that the effect heats a quantity of water.
    Since the load is an electric load and a similar stop occurs, a not insignificant amount of heat will be generated. Since the load (7) is a storage system for electrical energy, it can serve as reserve power in the hydropower station, and there be used as local power or as emergency power.
    权利要求:
    Claims (7)
    [1]
    A device for redirecting electrical energy from an electrical generator in a water station comprising a control system (5) for controlling the device and a generator switch (3) which connects the generator to the mains (4), characterized by an electrical switch (6) arranged connecting an electric load (7); that the control system (5) is connected to sensor units within generator (2) and generator switches (3) which indicate the generator speed and / or the output of the generator and the position of the generator switch (3), the control system (5) being arranged to activate the electrical switch (6) to switch on the electrical load (7) after determining from control sensors from the sensor units within the generator (2) and generator switch (3) that the generator switch (3) is open, and that a speed increase exceeding a predetermined threshold value takes place in the generator (2), or the output power of the generator is less than a predetermined threshold value. .
    [2]
    The device according to claim 1, characterized in that the electric load (7) consists of an electrically coupled flywheel. .
    [3]
    The device according to claim 1, characterized in that the electrical load (7) consists of a storage system for electrical energy. .
    [4]
    The device according to claim 1, characterized in that the electrical load is a combination of a storage system and an impedance load. .
    [5]
    The device according to claim 1, characterized in that the electric load generates an excess of heat which is used to heat the plant.
    [6]
    The device according to claim 1, characterized in that the electric load stores the received energy which is then used for electricity generation in the plant 10 15 CONTROL SYSTEM FOR OVERWHELMING REDUCTION IN HYDROPOWER STATIONS URBAN LUNDIN AUGUST 15, 2012
    [7]
    A device for redirecting electrical energy from an electrical generator in a water station comprising a control system (5) for controlling the device and a generator switch (3) which connects the generator to the mains (4), characterized by an electrical switch (6) arranged connecting an electric load (7); that the control system (5) is connected to sensor units within generator (2) and generator switches (3) which indicate the generator speed and / or the output of the generator and the position of the generator switch (3), the control system (5) being arranged to activate the electrical switch (6) to switch on the electric load (7) after determining from control signals from the sensor units within generator (2) and generator switch (3) that generator switch (3) is open, and that the output power of the generator (2) is below a predetermined threshold value which is induced by a normal stop operation from a turbine regulator.
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    同族专利:
    公开号 | 公开日
    SE536639C2|2014-04-22|
    WO2014027951A1|2014-02-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE520399C2|2001-03-23|2003-07-08|Abb Ab|Electric power plant with means to dampen power commuting, as well as associated process, microprocessor and computer software product|
    US7276807B2|2006-01-19|2007-10-02|General Electric Company|Wind turbine dump load system and method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1230080A|SE536639C2|2012-08-15|2012-08-15|Surveillance reduction control system in hydropower stations|SE1230080A| SE536639C2|2012-08-15|2012-08-15|Surveillance reduction control system in hydropower stations|
    PCT/SE2013/050971| WO2014027951A1|2012-08-15|2013-08-14|Control system for overspeed reduction in water power plants|
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