High-power intelligent harmonic and reactive current generating device based on IGBT

Abstract

The invention relates to a high-power intelligent harmonic and reactive current generating device based on an IGBT inverter, belonging to the field of power electronic technology. The device comprises a circuit breaker, a fuse, a high-pass filter, two reactors, a precharge circuit, an inverter, a power converter and a control circuit, wherein the circuit breaker is respectively connected with a test point of an electrical power system and the fuse; an output end of the fuse is respectively connected with the high-pass filter and an input end of the first reactor in parallel; an output end of the first reactor is sequentially connected with the precharge circuit, the second reactor and the inverter in series; a signal end of the control circuit is respectively connected with input ends of the first and the second reactors; an output end of the control circuit is connected with a control end of the inverter, and an input end thereof is connected with the power converter; and an input end of the power converter is connected with the test point of the electrical power system. The high-power intelligent harmonic and reactive current generating device adopts the IGBT to lead a three-phase alternating-current power supply to be rectified into a direct-current power supply, and controls the direct-current power supply to be inverted into the needed harmonic current by combining constant current loop algorithm.

Description

technical field [0001] The invention relates to a device in the technical field of power electronics, in particular to a high-power intelligent harmonic and reactive current generator based on an IGBT inverter. Background technique [0002] With the development of power electronic technology, power electronic devices have been rapidly promoted, and these nonlinear loads also inject a large amount of harmonics and reactive power into the grid. Harmonics will seriously affect the safe, reliable, and economical operation of electrical equipment and power supply systems. Some harms of harmonics are as follows: induce harmonic amplification in the power grid, cause harmonic overvoltage and overcurrent, cause accidents, damage capacitor compensation and other electrical equipment. It leads to additional loss and overheating of asynchronous motors and transformers, followed by mechanical vibration, noise and harmonic overvoltage, which reduces the efficiency and utilization of suc...

AI Technical Summary

Problems solved by technology

[0005] However, this prior art is implemented by a three-phase bridge-type fully-controlled rectifier bridge based on silicon controlled rectifiers. This technology can only output a specific 6k±1 harmonic, and the harmonic order cannot be set arbitrarily, and can only output inductive Reactive current, capacitive reactive current cannot be output, and the output voltage range of the three-phase full bridge structure is narrow, which can only meet the grid-connected requirements of the AC380V system, but cannot meet the grid-connected requirements of the AC690V system