Electric network positive and negative reactive power compensation device

Abstract

The invention discloses an electric network positive and negative reactive power compensation device which is applied to compensate the voltage and the reactive power of an electric network. The electric network positive and negative reactive power compensation device comprises a pressure regulator (2), one or a plurality of capacitors (9) and one or a plurality of reactors (6), wherein the line inlet end of the pressure regulator (2) is connected with a bus (7) by a circuit breaker (1); the capacitor (9) and the reactor (6) are connected with the line outlet end of the pressure regulator by one or a plurality of switches; after being connected with the reactor and the switch (4) connected in front of the reactor in parallel, the capacitor and the switch (3) connected in front of the capacitor are connected to the line outlet end of the pressure regulator (2); and the reactor is connected to the inside of a branch circuit of the capacitor in series. The invention provides a still reactive power compensation device which can supply capacitive compensation and inductive compensation, regulates the reactive power output of the capacitor and the reactor by regulating the output voltage of the pressure regulator, does not switch the capacitor at rated voltage, prevents serious overvoltage and inrush current and can realize finite order fine regulation in a total range from rated capacitive compensation capacity to rated inductive compensation capacity.

Description

technical field [0001] The invention relates to a grid reactive power compensation device, which is applied to the compensation of grid voltage and reactive power. Background technique [0002] The general electrical equipment in the power grid is an inductive load, while the line itself is a capacitive load. Reactive power in the grid exists all the time, and reactive power compensation and control devices are used in large and small substations or power usage places. Under normal circumstances, the entire grid system is inductive, and capacitive compensation is required for the grid at this time; but when there are fewer users and light loads, the entire grid system presents a capacitive state, and inductive compensation is required at this time. [0003] Since the general electrical equipment in the power grid is an inductive load, the general reactive power compensation device is directly connected to the capacitor bank in the power line, and is controlled by a computer...

AI Technical Summary

Problems solved by technology

However, at present, this kind of equipment cannot perform inductive compensation on the power consumption system, which will cause unnecessary losses on the transmission line or affect the normal operation of power consumption equipment for networks that require frequent inductive compensation

[0005] Connecting a synchronous condenser to the power line can provide both capacitive compensation and inductive compensation, but the synchronous condenser is a running device, which requires high maintenance and cannot adapt to unattended operation. At present, the synchronous condenser is used for unattended power grid The power compensation technology is an obsolete technology, and the static var compensation adjustment method is being vigorously developed at present.

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