SU517108A1 - Device for automatic control of the hydroelectric power active power - Google Patents

Description

one

The invention relates to the field of automatic control of the power system mode by active power.

A device for automatically controlling the active power of hydroelectric power plants is known, comprising a summing amplifier, the output of which is connected to one of the inputs of a setpoint generator for the relative increase in water consumption, the output of which is connected to the second input of a summing amplifier, and a circuit for controlling the active power of hydraulic units. Each circuit contains a functional converter, the input of which is connected to the output of the relative increment setting unit, and a tracking system for controlling the active power of the hydraulic unit, the input of which is connected to the output of the functional converter.

The purpose of the invention is to increase the reliability of parallel operation of power systems with weak connections.

This goal is achieved by the fact that the proposed device is equipped with a controllable multiplier, a sensor for the number of working hydraulic units and a controllable divider. The second input of the relative gain controller is connected to a controlled multiplier, the input of which is connected to the output of the sensor of the number of working hydraulic units, and between the output of the summing amplifier and

the combined second inputs of functional converters included a controlled divider, the second input of which is connected to the output of the sensor of the number of working hydraulic units.

The drawing shows a functional diagram of the proposed device.

It contains a summing amplifier 1, a setting unit 2 of the relative increase in water consumption and a control circuit of the active power of the hydraulic unit, each of which contains a functional converter 3 and the following system 4 of controlling the active power of the hydraulic unit. The device also contains a frequency deviation meter 5, a controlled divider 6, a controlled multiplier 7, and a sensor 8 for the number of operating hydraulic units.

The summing amplifier 1 is designed to isolate the difference between the specified relative increase in es and the output signal q of the setting device 2, which is an integrating organ. The constant integration of block 2 with the help of a controlled multiplier 7 varies in proportion to the number of working hydraulic units of p. The output signal of amplifier 1 is fed to the input of divider 6, in which this signal is divided by the number of working hydraulic units. The output signal of the divider 6 post -1. K (

It is fed to the inputs of functional converters 3, where it is summed with the output signal of setpoint 2, and the sums of these signals are converted into signals proportional to the powers given by operating hydraulic units, ..., These signals are fed to the following systems 4. Other inputs of systems 4 output signals are frequency deviations in the power system.

In the steady-state mode, the output signals of amplifier 1 and divider 6 are equal to zero, as a result, the signal from the output of setpoint 2 is equal to the input signal of the device — the specified relative gain

9: Sun,

and the sum of the capacities developed by hydraulic units is equal to the sum of the powers assigned to them

p, + ... + RP RU, G, + ... +, "

 f, (79c) + .- + f «(8c).

In a transient mode, for example, with an increase in the specified relative gain (7es, at the output of amplifier 1, a signal of 9es-9 appears, which controls the setting device 2 and divides in divider 6 and the number of operating hydraulic units p.

As a result, the inputs of functional converters receive a signal

 . P

at the first moment after increasing the setpoint relative increment, the signal q is equal to the specified relative increment at the moment preceding its increase ((7 ° C) o, and therefore the change from the normal signal at the input of the functional converter of each of the l operating hydraulic units is

wes (es) o

and the change in the sum of these inputs is

zs - (wes) o „,, I

 - (780- WsJo.

Consequently, the change in the total power, given by the working hydraulic units, and developed by them is equal to

517108

the power of one hydraulic unit, the corresponding change in the relative increment given to it by the value of es- (9 ets) in this way, at the first moment the transmission coefficient of the proposed device does not depend on the number of operating hydraulic units. From the moment the output signal q of the setpoint 2 begins to change and as it approaches the new value (/ es, the difference between es- q will begin to decrease, and when the steady state occurs, it will disappear altogether.

As the number of working hydraulic units increases and the corresponding setpoint time increases, the approach of q to the new value of es slows down and, consequently, the transition to the new value of the total power specified by the new number of operating hydraulic units proceeds more slowly.

Claims (1)

Invention Formula A device for automatic control of the active power of hydroelectric power plants, containing a summing amplifier, the output of which is connected to one of the inputs of the setpoint generator for increasing the water consumption, the output of which is connected to the second input of the summing amplifier, and the active power control circuit of hydraulic units, each of which contains a functional converter, the input of which connected to the output of the unit for relative increment, and a tracking system for controlling the active power of the hydraulic unit, d is connected to the output of the function generator, characterized in that, in order to increase the reliability of the parallel operation of the power system, it is provided with a controllable multiplier sensor of working hydraulic units and controllable divider; the second input of the relative increment setting knob is connected to a controlled multiplier whose input is connected to the output of a sensor of the number of working hydraulic units, and between the output of the summing amplifier and the combined second inputs of functional converters a controlled divider is connected, the second input of which is connected to the output of the sensor of the working hydraulic units. RP