SU1379868A1 - Power plant voltage control device - Google Patents

Abstract

The invention relates to the field of electrical engineering, in particular to the automatic regulation of the electrical modes of power plants. The purpose of the invention is to increase reliability. In normal mode, the presence of a signal at the output H of the control unit of limit modes 2 allows the passage of the More command from the central control unit 1 to the output of the device. Simultaneously with the passage of this command in the memory unit 6, the initial setting value of the automatic excitation controller coming from unit 3 is memorized, and through the short-term memory unit 7 a signal is sent to one of the inputs of the conjunctor 5. The difference between the original and the increasing i (L

Description

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Commands More than the current setpoint value found in comparator 8 triggers the null organ 9 and results in a signal at the second input of conjunctor 5, which is prepared by the possibility of

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

The aim of the invention is to increase the reliability of operation.

The drawing shows a block diagram of the proposed device.

The device contains one central control unit 1, other units - by the number of generators. The central control unit has two outputs (B - More and M - Less) for each generator. Block 2 control of limit modes also has two outputs. There is a signal at the output H, if the parameters of the generator mode have a value less than the maximum allowed by the value of a given dead zone, and at the output P, if the mode parameters exceed the allowable limits. The ARV setpoint determination unit 3 has the output of the current setpoint value obtained by measuring or calculating, the Conjunctors and 5 each operate according to the logic scheme I.

The memory block 6 additionally introduced has a command input K, when a signal appears on which the current value of the information available at the information output I is entered into the memory of this block.

The block 7 of short-term memorization, when a signal arrives at its input, produces an output signal and holds the latter for the entire duration of the signal's existence at the input and for a given time delay after its disappearance.

One output of the central control unit 1 and the output of the first conjunctor 4 serve as outputs of the section 79796

SRI team Less. If, in this case, the generator mode exceeds the permissible limits, a signal appears at the output P of the control unit for limit modes 2 and conjunctor 5 generates a signal for unloading. 1 il.

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The device is designed to be connected to the installer P-1m with an ARV generator device, the second output of the central control unit 1 and the first output of the limit control unit 2 are connected to the inputs of the first conjunctor 4, and the second output of the limit control unit 2 is connected to the first input of the second conjunctor 5 the output of which is connected to the first output of the central control unit 1, and the output of the set 3 of the ARV setpoint is connected to the information input I of the memory block 6 and to one of the inputs of the comparator 8, to the other input of which The information output of the memory block 6 is connected, the output of the comparator 8 is connected to the null organ 9, the output of the latter is connected to the second input of the second conjunctor 5, the output of the first conjunctor 4 is connected to the command input of the memory block 6 and to the short-term memory 7 and the output of this block - to the input of the second conjunctor 5, and on other generators - similarly.

The device works as follows.

In normal mode, the presence of a signal at the output H of unit 2 of the control of limit modes allows the passage of the More command from the central control unit 1 to the output of the device. Simultaneously with the passage of this command, in memory block 6, the initial value of the setpoint of the AIV is memorized and a signal is sent to one of the inputs of the conjunctor 5 through the block of short-term memory.

The difference between the original and the increasing one, under the influence of the More command, is the current setpoint value.

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found in comparator 8, causes the null-organ 9 to be triggered and a signal appears at the second input of conjunctor 5, which prepares the possibility of passing through the last command Less

If, in this case, the generator mode exceeds the permissible limits, a signal appears at the output P of the unit 2 of the control of the limit modes, and conjunctor 5 generates a signal for unloading.

The latter returns either before the mode returns to admissible limits, when the signal at the third input of conjunctor 5 disappears, or before the setpoint returns to its initial value, when the signal at its second input disappears.

The signal for unloading can pass only when there is a More command from the negative control block 1 or shortly after the disappearance of this signal during the block time delay and short-term storage, which is chosen sufficiently small. This provides a high probability that this command was the reason for exceeding the limits.

It is possible (albeit not very likely) that for a short period of time, determined by the duration of the signal More than the central control unit 1 and the time delay of the short-term memory unit 7, the voltage in the power system will decrease, as a result

under the action of ARV, the generator parameters exceed the permissible limits. In this case, the device will produce the required reductions, ARV settings. However, this decrease will be no deeper than before the initial setpoint, which took place a few seconds before what gives reason to consider such an action as valid.

Thus, in the proposed device, the requirement that its action should not lead to the generator mode going out of acceptable limits is fully satisfied.

VNIIPI Order 987/54

Produced-tsoligr. pr-tie, Uzhgorod, st. Project, 4

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This achieves the goal - increasing the reliability of the device.

The device can be implemented on both analog and digital equipment.

Claims (1)

Invention Formula The device for regulating the voltage of a power plant, containing for each generator a control unit for limit modes, a block for determining the setpoint of the AED, for a conjunctor, and a central regulating unit common to all generators, each having two outputs for each generator, one output of the central regulating unit and the output of the first conjunctor the device outputs intended to be connected to the generator's installation device, the second output of the central control unit and the first output of the control unit The first modes are connected to the inputs of the first conjunctor, and the second output of the control unit of the limit modes to the first input of the second conjunctor, the output of which is connected to the first output of the central control unit, characterized in that, in order to increase the reliability of operation, generator, a memory unit, a comparator, a null organ and a short-term memory unit, the output of the ARV setpoint determining unit being connected to the information input of the memory unit and to one of the comparator inputs, to another input The information output of the memory unit is connected, the output of the comparator is connected to a null organ, the output of the latter is connected to the second input of the second conjunctor, the output of the first conjunctor is connected to the command input of the memory unit and to the short-term memory unit and the output of this block to the input of the second conjunctor, and on other generators - the same. Circulation 650 Subscription