High-voltage dynamic capacitance compensator based on thyristor control

Abstract

The invention relates to a high-voltage dynamic capacitance compensator based on thyristor control. The compensator comprises an electromagnetic voltage regulator T, a capacitor group C, a controller K and a power factor collector CR; and the compensator is mainly characterized in that the capacitor group C is connected in series with a high-voltage working winding T2 of the electromagnetic voltage regulator T, a thyristor assembly P of the electromagnetic voltage regulator T and a low-voltage control winding T1 of the electromagnetic voltage regulator T form a closed loop, one end of the controller K is connected with the power factor collector CR, and the other end of the controller K is connected with a thyristor assembly P. The compensator uses the thyristor assembly P to control high voltage, the thyristor assembly P is prevented from use in serial connection, and capacitance compensation amount is adjusted rapidly continuously in high reliability; the thyristor assembly P works at the low voltage side of the electromagnetic voltage regulator T, and the difficulty in shunting and voltage dividing after serial and parallel connection due to voltage withstand requirements is avoided; system harmonic waves are reduced through isolation of the electromagnetic voltage regulator T; and high-voltage working winding T2 has certain reactance, and can be used to replace a serial reactor to reduce the system cost.

Description

Technical field [0001] The invention belongs to the technical field of reactive power compensation in power systems, and relates to a high-voltage dynamic capacitance compensation device based on thyristor control, in particular to a high-voltage dynamic capacitance compensation device based on thyristor control that is suitable for local compensation and centralized compensation of high-voltage power grids. Background technique [0002] At present, high-voltage reactive power compensation devices are divided into capacitor group switching compensation and dynamic compensation, and dynamic compensation is further divided into SVG and SVC. The group switching method of capacitors cannot continuously adjust the reactive power, and the response speed is slow; the dynamic compensation method has a fast response speed, and the compensated reactive power can be continuously adjusted, but its cost is high, especially for SVG, which is currently only suitable for large capacity Regi...

AI Technical Summary

Problems solved by technology

The group switching method of capacitors cannot continuously adjust the reactive power, and the response speed is slow; the dynamic compensation method has a fast response speed, and the compensated reactive power can be continuously adjusted, but its cost is high, especially for SVG, which is currently only suitable for large capacity Regional substations; the cost of SVC is lower than that of SVG, but its own loss is large; another dynamic capacitance compensation on the market uses a thyristor directly connected in series to the main circuit of the capacitor, and adjusts the terminal voltage of the capacitor bank through the change of the phase angle of the thyristor to adjust the capacity. It solves the shortcomings of the above compensation methods very well, but it generates large harmonics, and because the thyristor components need to be connected in series and parallel, the reliability is not high

Images