Optimization control method for Boost PFC comprising active energy storage unit

Abstract

The invention discloses an optimization control method for a Boost PFC comprising an active energy storage unit, and belongs to the field of AC-DC power conversion. The invention aims at a problem of reference distortion, caused by the condition that an output voltage of a rectifier bridge is taken as a sine reference, in a conventional Boost PFC mean current control method. The method comprises the steps: converting an input sine voltage into a square signal through a square wave conditioning circuit, enabling a digital controller to capture the rising and falling edges of the square signal, and generating a pure sine signal as a sine reference through an anti-error capturing phase-locking algorithm, so as to improve the reference distortion; deducing an input feedforward and load feedforward algorithm on the basis that a sine reference control method is generated, so as to improve the capability of an output voltage in resisting input and load disturbance and increase the tangential velocity of a light load tangential algorithm. The method achieves the deduction of an input current of the active energy storage unit as the reference through the generated sine signal and the output current, and saves a band-pass filter circuit which samples the input current reference of the active energy storage unit. Moreover, the method improves the power density and efficiency of a converter.

Description

technical field [0001] The invention belongs to the technical field of power conversion, in particular to the technical field of AC-DC power conversion. Background technique [0002] Electric energy is one of the most important energy sources in the current society, among which the AC grid occupies a dominant position. However, direct current is widely used in many occasions in daily life, such as computer power supply, server power supply, communication power supply, and electric vehicle charging piles. In recent years, with the rapid development of cloud computing, communication, electric vehicles and other industries, people's demand for direct current is also increasing day by day, and higher and higher requirements are placed on the efficiency, power density and power quality of the conversion device. [0003] The most commonly used single-phase AC-DC rectification topology is Boost PFC. The staggered parallel Boost PFC can evenly distribute the heat source due to the...

AI Technical Summary

Problems solved by technology

[0007] The present invention improves on the problems of sinusoidal reference distortion in the current Boost PFC control method; slow dynamic response of Boost PFC, slow phase cutting speed; and complex control sampling and conditioning circuits of Buck / Boost type active energy storage units.

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