SU686135A2

SU686135A2 - Method of automatic control of sychronous generator excitation

Info

Publication number: SU686135A2
Application number: SU772460036A
Authority: SU
Inventors: Валерий Львович Невельский; Михаил Аронович Эдлин
Original assignee: Научно-Исследовательский Институт Постоянного Тока
Priority date: 1977-03-09
Filing date: 1977-03-09
Publication date: 1979-09-15

Description

1one

Изобретение относитс к способам автоматического управлени и регулировани возбуждением мощных синхронных машин.This invention relates to methods for automatically controlling and controlling excitation of powerful synchronous machines.

В авторском свидетельстве № 448562 описан способ управлени возбуждение синхронного генератора, заключающийс в том, что с целью повышение эффективности и надежности управлени повышение уставки автоматического регул тора возбуждени (АРБ) по напр жению осуществл етс в переходном процессе по факту отклонени режимного параметра на определенную величину . При отклонении режимного параметра на большую величину производитс полное (потолочное) форсирование возбуждени в течение времени, пока напр жение генератора не достигнет уровн , соответствующего повышенной уставке АРВ по напр жению.The author's certificate No. 448562 describes a method for controlling the excitation of a synchronous generator, which consists in the fact that in order to increase the efficiency and reliability of control, the increase in the set point of the automatic excitation controller (ARB) on voltage is carried out in a transient process upon the deviation of the mode parameter by a certain amount. When the mode parameter deviates by a large amount, a full (ceiling) excitation of the excitation takes place during a time until the generator voltage reaches a level corresponding to the increased voltage setting of the APB.

При использовании указанного способа возникают определенные трудност с определением и выбором значени величины отклонени режимного параметра , при превышении которой необходимо форсировать возбуждение. Так, при малых значени х этой величины (при малых значени х уставки по отклонению режимного параметра) форсирование возбуждени происходит и при легких переходных процессах, когда нет необходимости в дополнительном воздействии на систему возбуждени генератора. При этом управление возбуждением сопровождаетс необоснованно частым подъемом напр жени на шинах станции, что может привести When using this method, certain difficulties arise with the determination and selection of the value of the deviation of the regime parameter, above which it is necessary to force the excitation. Thus, at small values of this value (at small values of the setpoint for the deviation of the mode parameter), the excitation is forced at light transients, when there is no need for an additional effect on the generator excitation system. In this case, the excitation control is accompanied by an unreasonably frequent voltage rise on the station tires, which can lead

0 к снижению надежности основного оборудовани электростанций. При сравнительно больших значени х уставки по отклонению режимного параметра имеет место запаздывание в подаче форсиро5 вочного сигнала, что в р де случаев может привести к снижению эффективности воздействи системы возбуждени ,0 to reduce the reliability of the main equipment of power plants. With relatively large values of the setpoint for the deviation of the mode parameter, there is a delay in the delivery of a force signal, which in a number of cases can lead to a decrease in the efficiency of the action of the excitation system,

Таким образом, неселективность в Thus, non-selectivity in

0 управлении возбуждени по известному способу может привести к снижению надежности основного оборудовани энергосистемы или недоиспользованию потенциальных возможностей систег ы возбуждени синхронного генератора.The control of excitation according to a known method may lead to a decrease in the reliability of the main equipment of the power system or underutilization of the potential possibilities of the excitation system of the synchronous generator.

Целью изобретени вл етс повышение селективности и надежности управлени возбуждением синхронного генератора.The aim of the invention is to increase the selectivity and reliability of the control of the excitation of a synchronous generator.

Claims

0 This is achieved by the method of automatic control of the excitation of a synchronous generator measuring the time interval between the moment of supplying a force signal and the time when the voltage of a synchronous generator reaches a predetermined level, the resulting value of the time value is compared with the set point, the force is stopped if the measured value is less than setpoints, and resetting the setpoint of the voltage regulator to the pre-emergency level. The drawing shows a functional diagram that implements a method for controlling the excitation of a synchronous generator. The circuit contains a filter 1 of a constant component, a circuit of comparison 2 controllable keys: normally open 7-10 and normally closed 11, 12 and 13, time sensor 14 and summing amplifier 15 RRW. Filter 1 detects the LP deviation of the mode parameter P from its value in the pre-crash mode. In comparison circuits 2 and 3, the value of the AP is compared with the settings of Y and UZ, while UZ of P exceeding the value of A of the settings of U and U at the output of comparison circuits 2 and 3 is in a non-zero signal. The outputs of the comparison circuit 2 and 3 are connected respectively to the control inputs of the keys 7 and 8. The increase signal of the controller setpoint voltage is supplied to the summing amplifier 15 of the APB through the serially connected contacts of the keys 7 and 12, and compared in the comparison circuits 4 and 5 generator voltage values Vp with the settings Vj and Y,, while Y Y. If the value of V exceeds a predetermined setpoint, then a non-zero signal appears at the time of the corresponding comparison circuit. The output cxef-ttj of comparison 4 is connected to the control input of the key 11. The output of the comparison circuit 5 goes to the control inputs of keys 9 and 10 and one of the inputs of time sensor 14. On the other input of the time sensor, the force signal excitation f. The output signal of the time sensor through the contacts of the key 9 is fed to a comparison circuit 6, where this signal is compared with the setpoint V. A signal proportional to V is supplied for comparison to circuit 6 through the contacts of the key 10. At the output of the comparison circuit 6, a signal appears if the compared value - the output signal of the time sensor is less than the specified setpoint. The output of the comparison circuit 6 is connected to the control inputs of the keys 12 and 13 The appearance of a signal at the control input of any control key, from those indicated in Fig., Leads to the activation of the corresponding key with a closure - opening of its contacts. The value of the output signal of the time sensor 14 is proportional to the current value of time, measured from the moment of its launch. The sensor is triggered by a forcing signal F, arriving at one of its inputs; stopping the sensor with latching its output signal is detected by the signal received at its input from the output of the comparison circuit 5. In emergency modes characterized by the deviation of the operating mode napaj-ieTpa LP not exceeding the setpoint U2, the circuit implements the method of excitation control according to claim 1 .sv. No. 448562. In the emergency mode of the power system, if the mode parameter P is exceeded by a setpoint Y, in addition to triggering key 7 and sending a signal to ABB through the contacts of keys 7 and 12 to increase the setpoint of the regulator, key 8 is activated and feeds through the contacts of keys 8, 11 , 13 to the summing amplifier 15 of the full force excitation signal. When the force signal is sent to the ARV, this signal also occurs at the input of time sensor 14, the appearance of the signal at the sensor input causes it to start, and the start time is counted from the moment the signal was given to fully force the excitation. Forcing the excitation causes an increase in the generator voltage. When the generator voltage VP reaches the setpoint Y, a signal appears at the output of the comparison circuit 5, which is fed to the input of the sensor 14, fixes the output signal of the sensor to the level reached by the time of the comparison of the comparison circuit 5. The output from the output of the comparison circuit 5 the controlled keys 9 and 10 cause the closure of their contacts, as a result of which, to the inputs of the comparison circuit 6, a signal from the output of the time sensor 14 is proportional to the current time and counted from the moment of forcing the excitation, and the setpoint signal YY If the time sensor output signal is less than the set unit voltage (faster than the preset voltage level VP Y), then the comparison circuit 6 generates a signal which, acting on the control inputs of keys 12 and 13, causes these contacts to open keys. Actuation of the controlled keys 12 and 13 leads to the termination of the forced excitation and to the return of the setpoint of the regulator on the voltage to a pre-emergency condition. If the time interval between the moment of the start of the forcing and the moment of reaching the specified level (Vp v is greater than the specified value, i.e. the output of the time sensor exceeds the set%, then the output signal, the comparison circuit 6 is zero. This continues to force the excitation (key 13 are closed) at the near-voltage setting of the APB over voltage (the contacts of the key 12 are closed). The force is stopped when the generator voltage reaches the level (V j) whose value is selected in accordance with the value of increased control voltage regulator. When VP Yj, the comparison circuits 4 are triggered, which leads to the opening of the contacts of the key 8 and the termination of the excitation forcing. After the force is degraded, the APR mode is characterized by a higher value of the regulator setpoint for the voltage. by voltage, the level corresponding to the pre-emergency mode can be carried out automatically or manually in a few seconds. The use of the method provides (by choosing the value of the setpoint for the deviation of the mode parameter) forcing the excitation in all the emergency situations that pose a danger under the stability conditions, and eliminates the increase in voltage on the generator generator in light transient processes unjustified under the stability conditions. The use of time control to achieve a predetermined level while forcing the excitation increases the selectivity of the method of automatic excitation control and provides an increase in the efficiency of excitation control of synchronous generators. The invention The method of automatic control of the excitation of a synchronous generator auth.St. W 448562, characterized in that, in order to increase the selectivity and reliability of control, the time interval between the moment of supply of the force signal and the time when the voltage of the synchronous generator reaches a predetermined level is measured, the resulting value is compared with the setpoint and, if the measured value is less than the setpoint, stop forcing and resetting the setpoint of the voltage regulator to the pre-emergency level.