SU748774A1 - Device for automatic control of synchronous generator excitation - Google Patents

Description

(54) DEVICE FOR AUTOMATIC CONTROL

one

The invention relates to devices for the automatic control and regulation of the excitation of high-power synchronous generators.

Devices for automatic regulation of excitation (ARB) of synchronous generators are known, which increase the efficiency of excitation control due to the additional force signal 1 and 2.

The disadvantage of these devices is the fuzzy fixation of the moment of removal of the additional force signal.

 A device for automatically controlling the excitation of a synchronous generator is known, comprising a control parameter sensor, an output. which is connected to the input of the deviation sensor, an extreme value latching unit, a comparison unit, and the inputs of which are connected to the output of the deviation sensor and an output of the extreme value latching unit, a control key, to the input of which the output of the deviating sensor is connected,. and adder W.

The validity of this device is based on the fact that the extreme value of the deviation of the mode by the EXCITATION of the SYNCHRONOUS GENERATOR is fixed

parameter from its average value, which exceeds the specified setpoint, and increases the setpoint Arv of the synchronous generator for 5 times, if during a given time interval, the deviation of the mode parameter exceeds the fixed value.

The drawbacks of the device are

fO low selectivity, since practically the severity of the emergency process is not taken into account; the absence of a signal in the initial phase of the emergency process, which leads to a decrease (5 of the control efficiency of the generator excitation, and, as a result, an increase in voltage on the station tires, regardless of necessity, and a one-way change

20 settings.

In order to increase the efficiency of generator excitation control, a device for automatic control of excitation of a synchronous generator 9, comprising a control parameter sensor, the output of which is connected to the deviation sensor input, an Extreme Value fixing unit, a comparison unit, to the inputs of which

JO. Disconnect sensor output connected

 the fixing unit of the extremum value, the controllable key, to the input of which the output of the date- is connected. deviation chick, - and adder, supplying additional controlled loop Hb / W hbd which

the output of the block of extremum value fixing, the control inputs of the keys are connected to the output of the comparison block, and the outputs of the controlled keys are connected to the input of the adder.

The drawing shows a block diagram of a device for automatically controlling the excitation of a synchronous generator;

The circuit contains the control parameter sensor 1, connected to the input of the deviation sensor 2, the block 3 for fixing the extreme values, the output of the sensor of the deviation 2, the comparison block 4 and the control keys: normally closed 5 and normal open b.

In this case, the input of the key 5 is connected to the output of the deviation sensor, and the input of the key b is connected to the output of the block for fixing extreme values.

The inputs of the comparator unit are connected to the outputs of the deviation sensor and the fixation block of the extreme parameter.

The control inputs of the keys are connected to the output of the comparison unit 4. The outputs of the keys are connected to the input of the adder 7.

The device works as follows.

in a way.

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Signals proportional to the current values of voltages and currents in various elements of the power system come to the input of sensor 1 of the control meter, and output of sensor 1 forwards: a signal proportional to the current value of control parameter (II), the change of which characterizes the intensity and quality of the transition process in the power system. As a parameter of the control, relative or phase angle, active power, current of power lines or a combination of current and the voltage of the 1st various elements of the power system can be used depending on the power system circuit.

The output signal of sensor 1 is fed to the input of the deviation sensor 2, at the output of which a signal is generated, which is the reference deviation of the control meter in the transitional circuit From its value in the pre-crash mode. The input to e5lok J3 is a signal Proportional to the deviation of the control parameter (lp); Its value is in pre-crash modes.

The large output signal of the Christmas tree 3 (PeU) takes on values that are proportional to the values in the sequence of the extreme values of the Control Parameter deviation at.

Comparison block 4 compares the current value, the deviation of the LP parameter and the extreme value of the deviation of the IP parameter. The output signal of the comparator unit 4 is supplied to the control of the qi inputs of the keys 5 and b, which commute with the input of the adder 7, the output of the sensor 2 or the output of the unit 3.

If during the transient process, the deviation value of the control parameter of the PD exceeds the values of the extreme deviation of the PD, then the output signal of the comparison block 4 is zero and the adder, B, through the nml closed contacts of the key 5, receives a signal proportional to the value of the DP.

If during the transient process the value of the parameter deviation, the control turns out to be less than the value of the extreme value recorded at the time of comparison (LP LP), then the output of the comparison block 4 is a signal that triggers the control keys 5 and 6 J as a result of the accumulator ARV a constant signal is received that is proportional to the magnitude of the extremum recorded at the output of block 3 by the etsmu moment of time.

When using the device, the magnitude of the additional signal in the ARV - the magnitude of the change in the ARV voltage setting - is set in exact accordance with the intensity of the transient process regardless of the type of its implementation, while fully using the forcing capabilities of the generator excitation system and increasing the reliability of its operation. Increased reliability is provided due to lower real-time and maximum-level excitation levels in the oscillatory modes of power systems.

Thus, the use of the Device increases the efficiency of controlling the excitation of a synchronous generator in emergency conditions of power systems. Improving the efficiency of excitation control provides increased levels of dynamic stability and quality of transients in the power system.

Claims (3)

1. Author's certificate of the USSR 448562, cl. H 02 R 9/10, 1972. 2. USSR author's certificate number 470061, cl. H 02 R 9/14, 1973. 3. The copyright certificate in application 2626449 / 24-07, cl. H 02 R 9/14, 1977 (prototype).