Digitalized three-phase system power factor correction apparatus and correction method

Abstract

The invention provides a digitalized three-phase system power factor correction apparatus and a correction method. The digitalized three-phase system power factor correction apparatus comprises a power factor correction main circuit, a PFC controller, a PFC driver and an LCD display screen, wherein the power factor correction main circuit comprises an LCL three-phase filter, a three-phase six-switch full-bridge rectification circuit and a DC filtering capacitor, and the PFC controller comprises a simulation voltage and current signal acquisition module, an algorithm processing module and a digital modulation pulse output module. The algorithm processing module employs a digitalized mode to realize full-decoupling control, the digital modulation pulse output module generates spatial vector modulation pulses according to the output result of the algorithm processing module by using a digitalized pulse-width modulation method to complete driving of three-phase six switches. The power factor is high, the input current harmonic wave distortion is small, the efficiency is high, bidirectional transmission of power can be realized, and the digitalized three-phase system power factor correction apparatus is suitable for large-power occasions.

Description

technical field [0001] The invention relates to the field of three-phase system power factor correction, in particular to a digital three-phase system power factor correction device and method. Background technique [0002] In modern industry, large-scale DC motor power supply, arc welding power supply, aviation battery charging power supply, etc., have an increasing demand for high-power power factor correction (PFC), so high-power three-phase PFC has become a research hotspot in recent years. The basic topology of three-phase PFC includes three-phase single-switch PFC topology, three-phase two-switch PFC topology, three-phase three-switch PFC topology, three-phase six-switch PFC topology and three-phase multi-level rectification topology. Among them, the three-phase six-switch boost PFC topology has become the first choice for large-capacity three-phase PFC topology due to its characteristics of small harmonic distortion of input current, high power factor, high efficiency...

AI Technical Summary

Problems solved by technology

[0004] Among many circuit topologies and control methods, the fully decoupled three-phase six-switch high-frequency PWM rectifier has good performance in both circuit topology and control effect, and is currently recognized by the academic community as the most promising large-capacity Three-phase DC power supply system solution, but due to the complexity of the control algorithm, it has not yet entered the commercialization stage in a complete sense

[0005] The analog control method of PFC is simple and direct, but there are many components in the control circuit, the circuit adaptability is poor, it is easy to be disturbed by noise, and the debugging is laborious

If an analog PFC correction chip is used to implement active power factor correction, the PFC correction system is not convenient for coordinated control with other control systems

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