基于变环宽的Vienna整流器滞环控制研究  

A Study on the Hysteresis Control of the Vienna Rectifier Based on Variable Ring Width

作　　者：尹军[1] 

机构地区：[1]西安理工大学自动化学院电气工程系,陕西西安710048

出　　处：《电气自动化》2016年第5期4-7,共4页Electrical Automation

基　　金：陕西省重点学科建设专项基金(5X1301);国家自然科学青年基金(51507138)

摘　　要：与传统的桥式电路相比,Vienna整流器由于具有同电平数下,开关应力低、体积小、低输入电流谐波,可靠性高等优良特性,在能量单向流动的高中等功率场合,特别在高压直流供电系统获得广泛应用。详细分析Vienna整流器工作机理的基础上,针对经典滞环控制策略开关频率不固定、网侧电流谐波大、电网电压抗扰性差等问题,引入电网电压加权的变环宽滞环策略,同时进一步针对Vienna整流系统直流侧中点电位不平衡问题,设计并采用了中点电位修正策略。为验证策略的正确性与可靠性,在理论分析基础上构建了完整的仿真模型与实验平台,仿真与实验结果表明设计有效减小了网侧电流畸变,同时可有效平衡中点电位。Compared with traditional bridge circuitry,Vienna rectifier has excellent characteristics such as low switch stress,small volume,low input current harmonics and high reliability under the condition of same electrical level. Therefore,it is widely applied on occasions of medium and high power with one-way energy flow,especially in the field of high-voltage DC power supply system. Based on a detailed analysis of the working mechanism of Vienna rectifier,with respect to unfixed switching frequency of the classical hysteresis control strategy,large current harmonics on the grid side and poor anti-interference of grid voltage,this paper presents a weighted grid voltage hysteresis strategy with variable wing width. Furthermore,a midpoint potential correction strategy is designed and adopted to solve the problem of midpoint potential imbalance on the side of Vienna rectifier. To verify the correctness and reliability of the proposed strategy,on the basis of theoretical analysis,it sets up a complete simulation model and experimental platform. Simulation and experimental results show that this design can reduce grid side current distortion and achieve good effect in midpoint potential balance.

关 键 词：三相三线Vienna整流器 滞环控制 中点电位平衡 非对称环宽 

分 类 号：TM461[电气工程—电器]