SU1520628A1 - Device for automatic control of voltage at buses of power stations - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to automatic regulation of voltage and reactive power in power plants or substations with synchronous compensators. The purpose of the invention is to increase reliability by providing continuous monitoring of the adjustment process. In the event of a non-realization of the control signal on one of the generators, the deviation generating unit 8 continuously outputs the control signal. At the same time, the central relay "more" 3 (or "less" 4) charges the integrator 6 until the zero-organ 7 is triggered, and the system is blocked through the blocking body 2. 1 il.

Description

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The invention relates to electrical engineering, in particular to automatic regulation of voltage and reactive power in power plants or substations with synchronous compensators.

The purpose of the invention is to increase the reliability 1 of ensuring the continuous control of the regulation process

The drawing shows the block diagram of the device

The device contains a central voltage regulator i, the input of which is connected to the voltage of the power plant busbars, the central blocking body 2, the central relay more than 3 and Less than 4, comparator 5, integrag. The torus 6f is a zero-organ 7 with two symmetrical relatively zero relay characteristics, the output is connected to the control input of the central blocking unit 2, individual for each generator unit -8 of the formation of deflection and sequentially connected three-element adjustment block 9c-9n and block -10ts control setting ARV.

The outputs of the regulating unit More and Less through the opening-i: the contacting contacts of the central blocking body 2 are connected to the corresponding inputs of the control unit of the ARV setpoint; In addition, the same codes of the regulating units 9 (-9 "all generators are connected through the elements OR 11 and 12 with corresponding centripet relays More than 3 and Less than 4,

The device works as follows

If there is a deviation of the current value of the distribution parameter from a predetermined one coming from the central controller 1 at the output of the regulating unit 9, -9, a control signal is formed, the duration of which is proportional to the deviation value. In case of non-realization of the control signal on one of the generators, the deviation at the input of the deviation generating unit 8 does not disappear, and at the output of the signal forming unit a control signal of a certain duration is continuously formed. Under the action of this signal, a central relay greater than 3 (or less than 4) locks the integrator b until the zero-organ 7 is triggered, as a result of which

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organ 2 makes the system lock,

In the absence of a malfunction in the normal control mode, the control pulses of any duration cannot charge the integrator to a value that ensures the null-organ 2 triggered, since in the pauses between the control signals the integral value is reset according to the aperiodic law. both on analog equipment and on any digital device.

Thus, the proposed device makes it possible to carry out automatic regulation of the voltage on the buses of the power station with the help of standard functional elements, with recognition of the failure in the implementation of control signals, which achieves unification and sufficient reliability.

Claims (1)

Invention Formula An automatic voltage regulator in the power plant wagons, containing a central voltage regulator, the output of which is connected to the first inputs of the deflection generating units of each generator, the second inputs of which are intended to connect the sensors of distribution parameters, and the outputs are connected to the corresponding three-position regulating units, and Setpoint control units for automatic regulators of generator excitation, characterized in that, in order to increase the reliability of the device operation, And by providing for continuous monitoring of the process of regulation, it is additionally equipped with OR logic elements, Vross central relays and Smaller relays, a comparator, an integrator, a 1-1 coil-organic, and a central, blocking block. com, while the inputs of the first logic element OR are connected to the inputs of the Most three-sensing control blocks, and its output is connected to the central relay More, the inputs of the second logic element OR are connected to the outputs Less than all the three-regulating blocks, and its output is connected to central relay Less, closing contacts of central relay More and Less 515206286 connected to the control inputs of the blocking unit, a splitter, the output of which is connected to the four contacts of which are connected between the cut-out of the three-position regular-open-loop contacts of the More and Small unit and the inputs of the control units later to the third input of the comparator and by the settings of the automatic controllers through the null organ to the input of the central excitation of the generators.