单周控制下三相四线制PFC整流器输出电压不均匀原因分析及均压数字控制方法

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摘要为解决三相四线制PFC整流器直流侧两输出电容电压不平衡对后级变换器带来的不利影响,本文重点推导出了电压不均衡的原因,在传统的单周控制基础上提出一种改进的数字控制方法用来解决输出电容电压不平衡问题。对输出端两电容分别应用霍尔器件进行采样,将采样值输入到DSP中,由数字控制芯片进行处理,将处理后的均压结果加入到单周控制环节中,实现输出电容的均压控制。最后在数字控制平台上搭建了3kV·A原理样机,通过Matlab仿真和实验验证了改进的控制策略的正确性和可行性,表明系统能满足稳定性与快速跟踪性要求。

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关键词 ：三相四线制, 单周控制, 均压控制, 数字控制

Abstract：To improve the adverse effect on load converter that the voltage of DC bus capacitor are unbalance in three-phase four-wire rectifier, the paper deeply analyzes the factors which affect the output voltage unbalance. In order to improve the voltage sharing on output capacitor, an improved one-cycle control on digital control is presented based on traditional one-cycle control. In order to obtain the sampling values, the hall devices are used. In this system, the sampling values are sent to the digital chip, because the DSP need to deal with the sampling values. In the end, the processing result adds into one-cycle control to realize voltage balance of series capacitor. To prove the theory,a prototype under digital control is built. At last, both Matlab simulation results and experimental results verify the validity and feasibility of the control scheme, and the system can not only achieve stability in a short time but also has good ability in tracking.

Key words： Three-phase four-wire one-cycle control voltage sharing control digital control

收稿日期: 2013-04-17 出版日期: 2015-05-25

PACS:

TM315

基金资助:浙江省自然科学基金重点资助项目（LZ12E07003）

作者简介: 张德斌男,1987年生,硕士研究生,研究方向为电力电子技术。南余荣男,1966年生,教授,博士生导师,研究方向为电力电子与电力传动、电机系统及其控制、运动控制。

引用本文:

张德斌, 南余荣, 张鑫. 单周控制下三相四线制PFC整流器输出电压不均匀原因分析及均压数字控制方法[J]. 电工技术学报, 2015, 30(8): 143-150. Zhang Debin, Nan Yurong, Zhang Xin. Analysis of Unbalanced Output Voltage of Three-Phase Four-Wire PFC Rectifier under Control of One-Cycle and Research on Voltage Sharing of Digital Control. Transactions of China Electrotechnical Society, 2015, 30(8): 143-150.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I8/143

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