Boost型APFC电路的双闭环控制研究

Double Closed-loop Control of Boost Type Active Power Factor Correction Circuit

电力电子装置的使用导致电网中引入了大量的谐波,影响供电质量。有源功率因数校正(Active Power Factor Correction,APFC)技术是抑制谐波电流、提高功率因数的有效方法。以单相Boost型APFC电路为研究对象,介绍了其工作原理,并建立了小信号模型。采用电压外环电流内环的双闭环控制,电压外环用于稳定输出电压,电流内环用于控制Boost电路的占空比,使得Boost电路输入侧电流与电压同相,实现网侧功率因数的提高。最后在MATLAB中搭建了单相Boost型APFC电路的仿真模型,仿真结果验证了控制方法的有效性。

The use of power electronic devices introduces a number of harmonic waves in the power grid.This affects the quality of power supply.Active power factor correction technology is an effective method to restrain harmonic current and improve power factor.The single-phase Boost APFC circuit is regarded as the research object,its working principle is introduced and its small signal model is built.A double closed loop control of voltage outer loop and current inner loop is designed.The function of voltage outer loop is used to stabilize the output voltage.And the current inner loop is used to control the duty ratio of the Boost circuit,makes the input current of Boost circuit track the phase of the input voltage,so the power factor of the grid is improved.Finally,simulation model of single-phase Boost APFC circuit is built in MATLAB,the simulation results verify the validity of the proposed control method.