SU828357A1 - Device for automatic control of synchronous generator excitation - Google Patents

Description

gosystems and generators, which reduces stability.

In order to increase static and dynamic stability, a device for automatically controlling the excitation of a synchronous generator, comprising a modulus of variance measurement unit connected to an adjustable reference source, a summing amplifier, and a correction unit connected to an adjustable reference source, is additionally equipped with a modal deviation measuring unit parameters on station tires, integrator and differentiator. The input of the deviation measurement unit of the operational parameters on the station buses is connected to the station buses, the output is connected to the integrator and differentiator inputs, the outputs of which are connected to the input of the correction unit, and the source of the reference signal is continuously adjustable.

The drawing shows a block diagram of the device.

It contains a block 1 measuring the deviation of the relevant parameters, an adjustable reference signal source 2, a correction block 3, a summing amplifier 4, a measuring unit 5 deviations of the mode parameters on the station buses, an integrator 6 and a differentiator 7 connected by inputs to the output of block 5, and the outputs to block adjustments.

The device works as follows.

When a voltage deviation in the system at the output of block 5, a signal appears that is proportional to this deviation and is fed to the input of integrator 6 and differentiator 7. The integral voltage deviation on the station buses is received from the outputs of blocks 6 and 7 to the input of correction block 3 and compares in this block, respectively, with the voltage on the stator tires of the generator and its derivative, which are removed from the stator buses of the generator using block 1.

In the case of a slow voltage change on the station tires, the output of block 3 has a signal proportional to the difference in the integral value of the voltage change on the station tires and the voltage on the generator stator tires, which enters the adjustable reference source 2 and changes the value of the reference signal in proportion to the difference voltages coming from the output of block 3. Accordingly, the input to the amplifier 4 receives a signal to increase or decrease the excitation. Thereafter, the voltage on the stator buses of the generator, changing due to a change in excitation, reaches the value corresponding to the voltage at the output of source 2.

For large disturbances in the system, at the output of block 5 there is a signal proportional to this disturbance, which is fed to the input of integrator 6 and differentiator 7. The signal from the output of differentiator 7 enters correction block 3, where it is compared with the derivative voltage

on the stator tires of the generator, and the signal corresponding to the difference, is fed to the input of the source of the adjustable reference signal 2, changing the value of the reference signal. The signal coming from the output of block 1 to

the input of the amplifier 4 changes the generator's excitation before the forcing of the excitation, and the voltage on the stator buses of the generator changes accordingly. The correction unit 3 maintains a signal corresponding to the force during the period of oscillations caused by the system controllers and, if at the end of the time interval the mode parameters oscillate repeats, which is detected in block 3 by comparing the oscillation parameters on the generator and system tires, the force is maintained for subsequent swing cycles until the system returns to the state of stability.

Claims (2)

1. USSR author's certificate No. 324012, cl. H 02 R 9/10, H 02 R 9/14, 1970. 2. USSR author's certificate No. 448562, cl. H 02 R 9/10, H 02 R 9/14, 1972 (prototype).