A dynamic reactive power compensation device based on igbt control high voltage

Abstract

The invention discloses a dynamic idle compensation device for controlling high voltage based on an IGBT (Insulated Gate Bipolar Translator), comprising an idle compensation branch which is connected with a power transmission power grid in parallel and further comprising a reactance transformer, wherein the primary winding side of the reactance transformer is connected with two ends of the idle compensation branch in parallel; the secondary winding side of the reactance transformer is connected with a direct-current power supply through an IGBT inverter; and a control end of the IGBT inverter is connected with a control circuit for triggering the control pulse of the IGBT inverter. Alternating-current current is injected into the secondary winding side of the reactance transformer and a main controller is used for comparing a target power factor with a current power factor obtained by calculating collected voltage and current data; a control pulse PWM (Pulse-Width Modulation) waveform for triggering the IGBT inverter is adjusted through closed ring control, so that a current amplitude injected into the secondary winding side of the reactance transformer is changed, the continuous adjustment of a main magnetic flow of an electric transformer is realized, and then the continuous adjustment of the primary winding side of the reactance transformer is realized, and the stepless continuous adjustment of the capacitance and the inductance of the power transmission power grid is realized.

Description

technical field [0001] The invention relates to a dynamic reactive power compensation device, in particular to a dynamic reactive power compensation device based on IGBT controlling high voltage. Background technique [0002] Reactive power compensation refers to improving the power factor of the power grid in the power supply system, reducing the loss of power supply transformers and transmission lines, improving power supply efficiency, and improving the power supply environment. At present, the commonly used reactive power adjustment equipment in my country is mechanical shunt reactor and switching capacitor, which belong to static compensation, and have the problems of discontinuous adjustment and slow response speed. The dynamic reactive power compensation device is usually composed of a thyristor-controlled reactor, a thyristor-switched capacitor and a filter bank. The thyristor-controlled reactor can quickly and continuously change the inductive current of the device ...

AI Technical Summary

Problems solved by technology

When the conduction angle of the thyristor is less than 90°, the current of the reactor is non-sinusoidal and contains harmonic components, so the fixed capacitor bank must be designed as a filter or equipped with another filter, which has a complex structure and large losses

In the high-voltage system, in order to reduce the voltage limit of the thyristor, the reactor is often used to increase the secondary winding, and the thyristor is used to adjust the short-circuit impedance value to realize the inductive reactance adjustment of the reactor. However, because the transformer works in the magnetic saturation area, the short-circuit loss is large, and the The production technical requirements and cost of the reactor are increased

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