大功率因数整流器单周期控制的稳定性研究

Study on Stability of One Cycle Controller in High Power Factor Rectifier

随着电力电子技术的快速发展,特别是可控硅技术的进步,电力电子设备成为电网主要的用电设备,而该设备多为非线性,因此,电力电子设备逐步成为电网的主要谐波源。功率因数校正是目前采用较为普遍的谐波抑制技术。本文首先阐述了功率因数校正的原理,通过对单周期控制的PFC Boost电路结构和参数设计分析,在MATLAB环境下搭建了仿真模型。为了分析单周期控制对高功率因数整流器的稳定性影响,本文分别从输入交流电压的变化、输出电容值的变化两方面进行仿真分析。从仿真结果知,基于单周期控制的PFC Boost电路具有很高的输入功率因数。此外,仿真结果表明,为了获得较高的功率因数,同时降低输出电压的纹波,一般取容值较大的输出电容。

With the rapid development of power electronics technology,especially in the advancement of thyristor technology,power electronic equipment has become the main electrical equipment of the power grid,and the equipment is mostly non-linear.Therefore,power electronic equipment has gradually become the main harmonic source of the power grid.Power factor correction is a harmonic suppression technology that is commonly used at present.This paper first expounds the principle of power factor correction.By analyzing the structure and parameter design of PFC Boost circuit with one cycle control,the simulation model is built in MATLAB environment.In order to research the influence of one cycle control on the stability of high-power-factor rectifiers,this paper analyzes the effects of input AC voltage and output capacitance values.From the simulation results,the PFC Boost circuit based on one cycle control has a high input power factor.In addition,the simulation results show that in order to obtain a higher power factor and reduce the ripple of the output voltage,an output capacitor with a larger capacitance is generally used.