基于直流侧储能电感电流最优给定的三相电流源型逆变器控制策略

doi:10.19595/j.cnki.1000-6753.tces.171629

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摘要传统三相电流源型逆变器在空间矢量调制过程中,直流侧储能电感电流在一个载波周期内通常被视为恒定,忽略了储能电感的充放电过程,导致储能电感电流出现断续或持续增加的问题。首先对传统三相电流源型逆变器直流侧拓扑做出改进,深入分析调制过程中电流源型逆变器的三种工作模式,提出任意工作条件下储能电感电流最优给定值的计算方法,并针对改进拓扑设计调制策略以维持储能电感电流的稳定。然后,建立两相旋转坐标系下三相电流源型逆变器的交流侧数学模型,据此设计电压内环与电流外环闭环控制系统。仿真和实验结果表明,直流储能电感的最优给定电流能够满足交流侧的电流需求且电流可以维持在限定值附近,同时逆变器负载电流能够精确跟随给定,系统具有良好的稳态和动态性能,证明了所提调制及控制策略的可行性与正确性。

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	苗轶如
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关键词 ：电流源型逆变器, 储能电感电流, 最小限定值, 最优给定电流, 负载电流控制

Abstract：In space vector modulation process for traditional three-phase current source inverter (CSI), DC storage inductance current is usually considered constant and charge-discharge process is ignored during a carrier period for traditional three-phase current source inverter, which causes storage inductance current discontinuous or continuous increasing. The DC-side topology of CSI was improved in this paper. Firstly, three working modes of storage inductance were analyzed in modulation process. The calculating method for optimal given value of storage inductance current was proposed under each working condition, and the modulation strategy was designed to guarantee storage inductance current constant for improved topology. Secondly, the math model of ac-side was derived in two-phase rotating reference frame. In addition, the closed-loop control system of voltage outer loop and current inner loop was designed. Finally, both the simulation and experimental results show the optimal given value of storage inductance current can meet the demand of ac-side and be maintained within a certain range. Besides, load current of CSI can accurately follow the given, system has good steady and dynamic performance. Thus, the correctness and feasibility of proposed modulation strategy and control method are proved.

Key words： Current source inverter (CSI) storage inductance current least limited value optimal given current load current control

收稿日期: 2017-11-29 出版日期: 2019-01-29

PACS:

TM46

基金资助:四川省科技厅重点研发资助项目（17ZDYF1517）

通讯作者: 苗轶如男,1988年生,博士研究生,研究方向为电流源型逆变器拓扑结构及其控制策略。E-mail: miaoyiru@cqu.edu.cn

作者简介: 和平男,1957年生,教授,博士生导师,研究方向为电力传动及其控制技术。E-mail: engineer @cqu.edu.cn

引用本文:

苗轶如, 刘和平, 华泽玺, 刘静, 程章格. 基于直流侧储能电感电流最优给定的三相电流源型逆变器控制策略[J]. 电工技术学报, 2019, 34(2): 349-362. Miao Yiru, Liu Heping, Hua Zexi, Liu Jing, Cheng Zhangge. Control Strategy for Three-Phase Current Source Inverter Based on Optimal Given Value of DC Storage Inductance Current. Transactions of China Electrotechnical Society, 2019, 34(2): 349-362.

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