SU1370711A1 - Apparatus for group control of active power of hydraulic power station - Google Patents

Abstract

The invention relates to power engineering and is intended for use in the automation of multi-unit hydroelectric power plants. The purpose of the invention is to increase the efficiency of HPP operation and improve the dynamics of power control. For this purpose, in addition to the common for all units, the task signal of the power unit of each unit includes two additional signal units, one of which is formed separately for each unit by the functional converter 6 and the integrator 7, and the other, formed in the arithmetic average unit 9, it is calculated in such a way that the total for all aggregates the effect of both additional signals is equal to zero. This allows the process of redistributing the load between the units to be carried out independently of the process of adjusting the power of the HPP. 1 il. (L

Description

SYCHT

00 about

 one

The invention relates to power engineering and is intended primarily for use in the automation of multi-unit hydroelectric power plants.

The aim of the invention is to increase the efficiency of HPS and to improve the dynamics of power control.

The drawing shows a block diagram of the proposed device.

The device contains a power setting device 1, a signal 2 for the total actual power of the hydroelectric station, a controlled divider 3, a central power controller 4, modular adders 5, functional transducers 6, integrators 7, first 8 and second 9 arithmetic average formation units.

The active power control device operates in the following manner.

The signal of a given power from the output of the unit G power after comparison with the signal 9 of the total actual power of the units is fed through a controlled divider 3 to the input of the central power regulator 4. The signal from the central power regulator 4 is fed to the inputs of the modular adders 5, which form the output control signals for the hydroturbine speed regulators (not shown), which, as feedback, are fed to the inputs of the functional converters 6. If the load distribution is optimal, those. the relative gains at the output of all functional converters are equal, the arithmetic average of the relative gains is equal to the relative gains of the aggregates, and the total signal at the input of the integrators 7 is zero. In this case, the system is in steady state. In the case when the load distribution does not correspond to the optimal, the signal at the output of block 8

.

where q. - relative gain of the 1st

unit;

n - the number of units. The total signal q -q at the input of at least one integrator 7 is not equal to zero, which leads to a change

0

R 0

5 0 5 0 5 0

112

integrator output, i.e. the power correction values P. Because the input signals on individual integrators may not be equal to each other, then the dP changes will take place at different speeds. In order to prevent the effect of the redistribution of load on the total capacity of hydroelectric power plants, it is necessary to ensure that the sum of the corrective actions of individual units is equal to zero at each current time. To do this, for each aggregate adder, two signals are supplied from integrator 7 and block 9 and LR; where

LRsr.

r, c |

as a result, the total corrective action is zero, i.e.

Z (uPcp-lr;) n-LP - .Z LR; 0

  I 1 h

Consequently, the device for distributing the load between the units, ensuring in the steady state an optimal load distribution between the units, generates a corrective effect on each unit, so that their sum at each current time is zero, i.e. the uneven distribution of the load between the units does not affect the total capacity of the HPP. Therefore, when the power plant changes its capacity, the process of power task development proceeds in the same way as with uniform load distribution, i.e. the realization of optimal load distribution does not affect the dynamic properties of the group control system.

Claims (1)

Ensuring that the sum of corrective actions is equal to zero simplifies the change of functional transducers when the current head of the hydroelectric station changes. Therefore, the proposed device can provide an optimal load distribution with very large changes in pressure at the hydroelectric station, when it is necessary to use several characteristics of relative increments for different ranges of change in pressure. It is also possible to use a three-coordinate functional 5 converter, in which the head is used as the third coordinate. Invention Formula The device of group regulation of the active power of hydroelectric units, 3 13707114 containing a power setting unit, to the output-two units of the formation of which the average is connected to a controlled arithmetic quantity, where the chopper, output connected to the cent-unit is connected between the outputs by the power control knob, the output of which is connected to the inputs of integrators , second block is on adders, the functional pre-between the outputs of the integrators and the input transformer and the integrator in the circuit behind the aggregate adders, and the subsequent power of each aggregate, which are connected together characterized in that the converter and the integrator include, in order to increase the efficiency, the feedback in the circuit HPP bots and improving the dynamics of the ragu-setting power of each aggregation of its power, it is equipped with a log.