SU1492417A1 - Device for distribution of reactive load between generators of electric stations - Google Patents

Abstract

This invention relates to automatic control of the electrical systems and stations. The purpose of the invention is to improve the accuracy of the distribution of reactive power and static stability. This is achieved due to the fact that in addition to the main equalization sensor, consisting of voltage meter 4 and current meter 10, a second equalization sensor is inserted, consisting of voltage meter 7 and current meter 9. Their output circuits through the switching contact 12 of the relay The power directions are connected to the DC diagonal of the rectifying bridge 16, which is the output of the equalization sensor. In the over-excitation mode, the main sensor is switched on to the equalization circuit beam, and in the under-excitation mode, the second equalization sensor is included in the beam circuit. 3 il.

Description

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The invention relates to the automatic control of the mode of electrical power systems.

The purpose of the invention is to improve the accuracy of the distribution of reactance power and static stability.

Figure 1 shows the mode diagram of the generator; Fig. 2 is a block diagram of a multipath star device for distributing a reactive load between generators of power plants; Fig. 3 shows a power direction relay with input terminals.

The diagram (Fig. 1) shows: 1 - a line characterizing the maximum active power of the turbine, 2 - a line corresponding to the limiting heating of the excitation winding, 3 - a line corresponding to the maximum heating of the outer packets of the stator iron. Lines 2 and 3 are circles with a center on the axis of reactive power. The device contains the meter 4 ports of the main sensor} P1 with the input terminals 5, the input terminals 6 of the voltage meter 7, the clamp1.1 8 the current meter 9 (meters 7 and 9 form an additional equation sensor), the current meter 10 with the input terminals 11, forming, in combination with the meter 4, the main equalization sensor, the switching contact 12 of the power direction relay 13 with the input terminals 14 and 15 of the voltage spike station and the total current of the generator, rectifying the bridge 16, the executive organizations 17 affecting the change generators for the purpose of the necessary distribution of reactive power, the sensor 18 of the distribution of the next generator, consisting of primary and secondary sensors, as for the first generator.

The device works as follows.

In the initial over-excitation mode, the power direction relay 13 is in a non-excitation state, the contact 12 is in the position shown in Fig. 2.

When n (station in 1), the non-excitation mode triggers the power direction relay 13 and switches the contact 12 from the current meter 10 and the voltage meter 4 to meters 7 and 9. At the output of the sensors, the equalization appears

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The characteristics displaying are concentric and curve 3 (Fig. 1). Due to the fact that curve 3, simulated by a circle centered on the abscissa axis, is determined by the voltage vector and the vector of reactive, current coinciding with it, and the phase of reactive current in over and under excitation mode are opposite and 10 currents should be opposite.

The use of the current meter and voltage meter in the operation mode of the station generators in the non-excitation region makes it possible to produce a more accurate distribution in shares of the available monies in this mode and increase the static stability of the mode.

Claims (1)

Invention Formula A device for distributing a reactive load between the generators of a power station, containing a control system made in the form of a multi-ray star, each beam of which consists of a sequence of 1Bo connected main equalization sensor consisting of a voltage meter and a current meter, and an actuator the voltage meter clamps serve to connect the voltage of the reiiepaTopoB tires, the current meter input clamps serve to connect to the generator current, characterized in that, in order to improve the accuracy reactive power distribution and static stability, it is equipped with a power direction relay with input terminals for connection to a voltage bus station and total generator stator current, second equalization sensor and rectifier} 1st bridge, one of the outputs of the second sensor voltage gauge is connected to the output of the main sensor voltage meter and one of the rectifier bridge AC terminals, the other voltage meter output the main sensor through the current meter and the switching contact of the power direction relay is connected to another AC output of the rectifying bridge, the DC diagonal of which is the output of the equation - niva1sh, second output terminal of the voltage meter BTOpt; ro sensor included in the current measurement of the current sensor of the main sensor The contact is a MODI-HOC direction relay.