SU1480013A1 - Method for controlling voltage in electric network - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase reliability by eliminating unstable regulation. The method allows to adjust the voltage in an electrical network having electrically close to each other located substations with discrete means of regulation. For this, the voltage on the substation buses is measured and impulses are formed at each substation, the periods of which for different substations do not coincide. The switching of the discrete control means at each substation is carried out under the simultaneous fulfillment of two conditions: the voltage goes outside the specified limits and the presence of the generated pulse. 2 Il.

Description

one

The invention relates to electrical engineering, in particular, to the regulation of the modes of the electrical network, having a substation (PS) that is electrically closely spaced with discrete voltage regulating means, such as shunt reactors (LP) and capacitor banks (KB).

The purpose of the invention is to increase reliability by eliminating unstable regulation.

FIG. 1 shows a block diagram of the device that implements the proposed method; in fig. 2a, b, c - timing diagrams of possible periods of operation of control systems

discrete facilities located at adjacent substations.

The diagram (Fig. 1) shows an electrical network with several electrically closely spaced MSs, each of which has discrete control means 1 with its own switching device, such as a switch 2, and a voltage transformer 3.

The device contains a measuring voltage body 4, a null-body 5 with a dead zone and an execution unit 6 on each PS, and additionally a block of 7 synchronous pulses is introduced into it at each PS,

four

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with

31/4

step switch 8 and two conjunctors 9 and 10.

The output of the voltage measuring organ 4 is connected by the input of the null organ 5, the first output of the null organ is connected to the input of the first conjunctor, the second to the input of the second conjunctor, the outputs of the conjunctors are connected respectively to the first and second inputs ig, the complementary unit 6, and the second inputs conjunctors are interconnected and on the first PS are connected to the first output of the step switch 8 of the first PS, on the second PS to the second output of the step switch of the second PS, on the third to the third output of the step switch of the third PS And so on.

In the diagrams of FIG. 2a, b, and rectangles correspond to the time periods for the output signal of the stepping switches, respectively, on the first, second, and third PS.

The device works as follows.

The voltage measuring organs 4 on each PS continuously or at a predetermined frequency measure the voltage of the PS buses. In case of its deviation beyond the specified limits of the insensitivity zone of null organs 5, a signal is received at the first input (depending on the sign of the deviation) of conjunctor 9 or 10-.

Regardless of this, blocks of 7 synchronous pulses of each MS periodically and simultaneously give pulses to the inputs of their step commutators 8. At the same time, the outputs of the step commutators of all the substations appear at the same time. But since the conjunctors at different PSs are connected to different outputs of the step switches, at any given time period only one of them receives a signal from the step switch to the second inputs of conjunctors 9 and 10. The corresponding conjunctor only on that PS, at the first input, which is during this time period the signal from

stepper switch. The output signal of the conjunctor goes to the corresponding input of the execution unit 6, which enables or disables the switching device 2 of the discrete control means 1 of this PS.

If the switching of discrete means of this PS is not enough to normalize the voltage, then after a predetermined period of time has elapsed, when the blocks of 7 synchronous pulses on all PS will switch the stepping switches 8, the output signal of one of them to some other PS goes to its conjunctor and similarly to the above, discrete control means will be switched at this PS.

In this way, reliable switching coordination of discrete means of controlling different substations is achieved without the need for making telemechanical connections with or between any central control center.

Claims (1)

Invention Formula The method of regulating the voltage of the electrical network, including substations with discrete control means, according to which the voltage on the buses of each of the substations is measured, compares each of the measured voltages with the set values and performs the switching of the corresponding discrete control means at the voltage output for a given value characterized in that, in order to increase reliability by eliminating unstable regulation, pulses are generated at each substation, the moments of existence Hovhan for different substations which do not coincide, and said discrete switching means for controlling is performed while the existence of the output voltage setpoint and the available shaped pulse. C Network) No one YU ten