SU1417106A1 - Method of distributing reactive load between synchronous generators operating in parallel - Google Patents

Abstract

The invention relates to power engineering, in particular, to the distribution of reactive load between parallel-running synchronous generators. The purpose of the invention is to improve the reliability of power supply. The distribution of reactive power between parallel-running synchronous generators of a power plant consists in determining the generator that is disconnected from the emergency automation devices when an emergency situation occurs in the power system, and its excitation current is changed so that the generator operates in the mode of maximum allowable consumption of reactive power. power. On the remaining generators of the power plant, the distribution of reactive load is carried out in such a way as to ensure the required voltage conditions on their tires and equality of the ratio of their current and permissible values of reactive power. 1 il. from the next

Description

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The invention relates to electric power industry, in particular, to the field of control of modes of electric power systems.

The purpose of the invention is to increase the reliability and power supply of consumers in emergency conditions of the power system.

The drawing shows a block diagram of a device for implementing the proposed method for distributing a reactive load between parallel-running synchronous generators.

The device consists of a central regulator 1 of busbar voltage 2 connected to one of the inputs of multiplication units 3, the other inputs of which are connected to the outputs of functional converters 4.

and the measured unit 5, and depending on the error signal, the generator excitation level changes until the generator consumes the maximum permissible value of the reactive load. For generators, for example, 8 and 9, not connected to the output circuit of the emergency control automation, the keys 11 are in the position "O." The signals from the outputs of block 4 are fed to the inputs of blocks 3, where they are multiplied with signals proportional to the voltage of buses 2. The signals from the outputs of blocks 3 through the closed contacts of control keys 11 are fed to the inputs of blocks 13, where they are compared with current values of reactive loads

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The inputs of the sensors 5 of the reactive load of the generators, measured by the blocks 5. The active load sensors behind the sensors 6 and the connection depend on the error signal of the blasts with the inputs of synchronous generators 7-9. The inputs of the functional converters 5 are connected to the outputs of the sensors 6 and null indicators 10. The inputs of the null indicators 10 20 are connected to two outputs of the control keys 11, one of the inputs of which is connected to the control voltage 12. The outputs of the sensors 5 are connected to the inputs of the units 13 of the comparison and the second

inputs of control keys 11. The outputs of the functional converters 4 are connected to the third inputs, and the outputs of the blocks 3 are connected to the fourth inputs of the control keys 11.

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13, the excitation voltages of the generators 8 and 9 are varied to eliminate this mismatch.

In the process of regulating the voltage of the tires 2, the reactive loads of the generators 8 and 9 change and can switch to the mode of reactive power consumption. In this case, a null indicator is triggered, which with its signals rearranges the characteristics of the functional transducers 4 to the parameters corresponding to the mode of reactive power consumption. As a result, generator 7, subject to

and the measured unit 5, and depending on the error signal, the generator excitation level changes until the generator consumes the maximum permissible value of the reactive load. For generators, for example, 8 and 9, not connected to the output circuit of the emergency control automation, the keys 11 are in the position "O." The signals from the outputs of block 4 are fed to the inputs of blocks 3, where they are multiplied with signals proportional to the voltage of buses 2. The signals from the outputs of blocks 3 through the closed contacts of control keys 11 are fed to the inputs of blocks 13, where they are compared with current values of reactive loads

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generators, measured by blocks 5. Depending on the error signal of the blog generators, measured by blocks 5. Depending on the error signal, the

13, the excitation voltages of the generators 8 and 9 are varied to eliminate this mismatch.

In the process of regulating the voltage of tires 2, the reactive loads of generators 8 and 9 change and can switch to reactive power consumption mode. In this case, a null indicator is triggered, which with its signals rearranges the characteristics of the functional transducers 4 to the parameters corresponding to the mode of reactive power consumption. As a result, generator 7, subject to

disconnecting from the emergency control device. The device operates as follows. automatics, operating in max. mode using central regulator 1

The voltage on busbars 2 is measured, which is converted into identical signals arriving at the inputs of multiplication units 3. The magnitude of the active load generators 7-9, measured by the sensors 6,

but the possible consumption of reactive power, and on the remaining generators, for example, 8 and 9, the required power is set to ensure a given voltage level.

are converted by functional converters 4 into signals proportional to the maximum permissible values of the reactive load of the generators. Control keys 11 can be in two halves.

Claims (1)

Invention Formula A method for distributing reactive loads between parallel-running synchronous generators, the groom; “Disabled (“ O) ”and“ Enabled 40 q-j-o measure the voltage on the generator- (B) buses. The normal position of the switches, the reactive and active loads of the pa is "O. If one of the generators, for example 7, is switched to the disconnection mode from the emergency control device when an emergency condition occurs. not on the voltage of the generators, ergosystem, the key 11 in parallel with the operating generators, the maximum permissible reactive load of the generator is determined, its situations in the power system are multiplied, this generator is transferred to the position "B. In this case, the control signal from the lines 12 through the closed contact of the key 11 is fed to the input of the null indicator 10, the obtained value is equalized with the generator reactive load and the excitation current is changed depending on the error signal, which is activated and switches the scale of consumers in emergency modes of the functional elements of the transforming-power system, determine the generator on its output when an emergency condition occurs. situations in the power system, and change the excitation current of this generator depending on the error signal of the reactive closed contact of the key 11 of the control 55 of the load of this generator and its limit is compared in block 13 with the current knowingly acceptable reactive load of the generator 7, load . body 4 to receive at its output a signal proportional to the maximum permissible value of the consumed reactive load of the generator. This signal through disconnection from the emergency control device, it operates in the max. but the possible consumption of reactive power, and on the remaining generators, for example, 8 and 9, the required power is set to ensure a given voltage level. 35 Invention Formula  q-j-o measure the voltage on the generator tires, the reactive and active loads of the panne on the voltage of the women of the generators, simultaneously operating generators, determine the maximum permissible reactive load of the generator, multiply its value by the voltage of the generator, compare the obtained value with the generator's reactive load and change the excitation current depending on the error signal, which is determined by the fact that, in order to increase the reliability of the power supply to consumers in emergency conditions of the power system,