SU860209A1 - Device for regulating reactive power compensation - Google Patents

Description

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The invention relates to electrical engineering, in particular, to power supply and distribution of electrical energy in networks or air lines with a voltage of more than 35 kV with continuously adjustable generation or consumption of reactive power.

Various reactive power compensation devices are known that can provide smooth adjustment of both its generation mode and consumption, for example, a static reactive power source containing controlled valves and uncontrolled inductances and capacitances Uj.

However, the well-known source has control complexity and insufficient reliability in general, the ability to generate higher harmonics into the network, and high installation costs.

These drawbacks are eliminated when using a continuously adjustable reactive power compensation device, consisting of synchronous compensators with transformers for connecting the mains to a voltage of more than 35 kb G2.

The disadvantages of this device when used in high voltage electrical systems is

The fact that in the consumption mode synchronous compensators may operate unstable, which reduces the reliability

- devices, and, in addition, the power of the synchronous compensator must be selected according to the mode of consumption.

The purpose of the invention is to reduce the cost and decrease the power of synchronous com pensors.

The goal is achieved by the fact that in a device for smooth control of reactive power in a high-voltage network containing

5 at least one synchronous compensator connected to the high-voltage network through a transformer, the transformer is made of three single-phase controlled reactor-transformers

20 armored cores with longitudinal-transverse magnetization, with the high and low voltage windings of the transformer reactors connected by the scheme, a star-triangle, each of these windings is made of two coils connected in series, and the control windings are made without transformer z with the rest of the windings and

30 are connected in parallel.

FIG. 1 is a schematic diagram of the proposed compensating device; in fig. 2 - section of a closed magnetic system.

Single-phase reactor transformers 2-4 are connected to the high voltage overhead line 1, the coils of the high voltage windings 5 and b and the low voltage 7 and 8 are connected in series with each other. The high voltage windings 5 and 6 are connected in a star, and the windings low voltage 7 and 8 are connected in triangle. Reactor transformers 2-4 have control windings 9 and 10 connected in parallel to each other, synchronous compensators 11 are connected to a low voltage network 12, to which low voltage windings 7 and 8 of transformer reactors 2-4 are connected.

The closed magnetic system 13 of armor type contains in the windows 14 overlays of 5-10 reactor-transformers. The device works as follows.

If the high voltage line 1 is not loaded or is little loaded, then compensation of its charging power is necessary.

In this case, the reactor transformers 2-4 are maximally magnetised and the synchronous compensators 11 are switched to the consumption mode. As the load of line 1 increases, its capacitance is more and more compensated by inductance due to currents flowing through the line. The biasing of the reactor transformers 2-4 decreases, their consumption and synchronous compensators 11 of reactive power decrease. When line 1 is loaded with a power close to natural, there is a minimum consumption of reactive power of transformers 2-4 due to its power and control range, and synchronous compensators 11 are switched to the mode of generating reactive power, providing the necessary margin under the conditions of system stability.

At the same time, the consumption of reactor power by a compensating device is mainly carried out by continuously adjustable reactor-transformers and to a much lesser extent by synchronous compensators, the power of which is selected according to the power that the compensating device must generate, therefore the unstable operation of synchronous compensators is lost and there is no overestimate synchronous compensators.

Claims (2)

1.Hud Cove B. BJ. Ivanov V.A. Managed static reactive power generator. - Electricity, 1969, №1. 2.Venikov V.A., Khudkov V.V., Anisimova A.D. Electrical systems. 5 T. I1. Transmission of energy by alternating and direct high voltage currents. ed VA Venikova. M., Higher School, 1978, p. 261-274 (prototype).