SU1417105A1 - Device for controlling voltage of power plant - Google Patents

Abstract

The invention relates to electrical engineering and can be used to regulate the voltage of power plants. The goal is to simplify and increase the reliability of regulation of power plants. The device contains a central control unit I and other units (by the number of generators). The central control unit has two outputs - “More (B)” and “Less (.M) per generator. The limit control unit 2 also has two outputs: the output H has a signal when the parameters of the generator mode are within acceptable limits, the output of the signal P appears when the mode parameters exceed these limits. Conjunctors 3 and 4 operate according to the logic circuit I. The block of short-term storage 5, when a signal arrives at the input, produces an output signal which is held for the entire time of the signal's existence at the input and for a short time after its disappearance. The null organ 6 produces an output signal when the signal at its input becomes greater than zero. I 1L. (About ate

Description

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about ate

The invention relates to electrical engineering, in particular to the automatic regulation of the regime of power plants.

The purpose of the invention is ironing and increasing reliability.

The drawing shows the block diagram of the proposed device.

The device contains one central control unit 1 and other units according to the number of generators. The central control unit has two outputs - “More (B) and” less (M) per generator. The limit control unit 2 also has two outputs: at the output H there is a signal when the parameters of the generator mode are within permissible limits, at the output P a signal appears when the operating parameters exceed these limits.

The first 3 and second 4 conjunctors work according to the logic diagram I. A block 5 of short-term memorization, when a signal arrives at the input, produces an output signal that is held for the entire time that the signal existed at the input and for an uncomfortable time delay after its disappearance. This shutter speed should be a shift between the output signals of block 1. A null organ 6 outputs an output signal when its output becomes greater than zero.

The additionally introduced third conjugator 7 also operates according to the scheme I. The integration block 8 has at its output a signal proportional to the time integral of the signals arriving at its information inputs (INF). The output of this block is instantly reset to zero when a signal arrives at the reset input (SBR). Inverter 9 has an output. The signal in the absence of a signal at the input and vice versa.

 The device works as follows.

In normal mode, the presence of a signal on the H of the control unit 2 limits the passage of the command "More from the central control unit 1 through the first conjunctor 3 to the output of the device." Simultaneously with the passage of this command to the output of the device, it arrives at the increasing INF input of the integration block 8, where it is integrated over time, and also at the input of the short-term memory block 5, through which it comes to the second input of the second conjunctor 4.

The occurrence of a signal at the output of the integration block 8 triggers a null organ 6, which sends a signal to the third input of conjunctor 4, which prepares the possibility of issuing the last command. At the same time, the signal of the null organ is fed to the input of the third conjunctor 7, which prepares the possibility of passing through it the signal "Less PA reduces the input INF of the integrating unit 8.

If the generator mode becomes the maximum allowed, the signal at the output H of the limit control unit disappears, and the signal "More than the central control unit 1 is blocked by the first conjunc tor 3, i.e. the passive limitation comes into effect. If an overload occurs, a signal appears at the output P of the limit control unit 2 and the second

conjunctor 4 issues the “Less to device output.” command. At the same time, this signal through the third conjunctor 7 enters the PA decreasing the INF input of the integrator. When this occurs, the accumulated integral decreases.

The generator unloading under the action of the command “Less continues either until the mode returns to permissible limits, when the signal at the first input of the second conjunctor 4 disappears, or until the integral accumulated in the integration block 8 decreases to zero, due to which the signal disappears at the third entrance of the second co-conjunctor 4.

Since in block 8, the integration first accumulates and then decreases the integral of the control commands that change the setting of the automatic excitation controller (ARB) first to one and then in the opposite direction, the zero value of the integral, i.e. the signal at the output of the block 8 integration, corresponds to the initial value of the ARV setting, which occurred before the central control unit applied the signal "More that led to overload. Due to this, the proposed device eliminates the need to determine and

memorizing the initial setpoint value.

The device can be implemented on analog or digital equipment.

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Claims (1)

Invention Formula A device for regulating the voltage of a power plant, containing for each generator a control unit for limit modes, two conjunctors, a short-term memory unit and a zero-organ, as well as a central control unit common to all generators, having two outputs for each generator the control unit and the output of the first conjunctor serve as the outputs of the device intended to be connected to the installation device M. of the automatic generator excitation controller, the second output In Central control unit and the first output limit control mode unit included in the inputs konyun5 Ktorov first and second output modes limiting control unit - the first input of the second koiyunktora ,. the output of which is connected to the first output of the central control unit, the input of the short-term memory unit is connected to the output of the first clincher, its output to the second input of the second conjunctor, to the third input of which the output of the zero-organ is connected, in order to simplify and increase reliability, it is additionally introduced for each generator, a third conjunctor, an integration unit having information inputs and a reset input, as well as an inverter, and a magnifying input. The integration unit is connected to the output of the first conjunctor, and the smart input is connected to the output of the third conjunctor. the reset input of the integration unit is connected via an inverter to the output of the short-term memory unit, the output of the integration unit is connected to the input of the null organ, and the inputs of the third conjunctor are connected to the first output of the central control unit and the zero organ output, and on other generators similarly.