滞环电流控制逆变器建模及分析 - 电工技术学报.pdf

20 10 年 6 月 电 工 技 术 学 报 Vol.25 No. 6 第 25 卷第 6 期 TRAN SACTION S OF CHINA ELECTROTECHNICAL SOCIETY Jun . 20 10 滞环电流控制逆变器建模及分析 1 1 1 2 王建华 张方华 龚春英 刘磊 （1. 南京航空航天大学航空电源航空科技重点实验室 南京 2 100 16 2. 南瑞继保电气有限公司 南京 2 11102） 摘要 基 Buck 变换器三端器件开关模型，建立了电感电流连续情形下恒定环宽变频滞 环电流控制方式小信号模型。该模型揭示了滞环电流控制目标是电流平均值，且该电流环在开 关频率较高时带来的相位延迟较小，因而电流环等效功率级可以视为一比例环节。该结论在大 信号分析时同样适用，在此基础上建立了滞环电流控制单相逆变器平均 性模型，并实现了对 闭环系统的降阶处理。根据劳斯判据，进一步研究了单相逆变器环路补偿设计准则，其能够很 好地兼顾系统稳定性及稳态动态性能。 关键词：滞环电流控制 变频 恒定滞环环宽 逆变器 劳斯判据 大信号分析 中图分类号：TM464 Modeling and Analysis of Inverter With Hysteretic Current Control Wang J ianhua1 Zhang Fanghua1 Gong Chuny ing 1 L iu L ei2 （1. Nanj ing University of Aeronautics and Astronautics Nanj ing 2 100 16 China 2. Nari-Relays Electric Co. Ltd. Nanj ing 2 11102 China ） Abstract In this paper, a small signal model of hysteretic current mode control with variable frequency and fixed hysteretic band is presented, based on three terminal switch cell of Buck converter in continuous current mode. This model reveals that the average current is the control target of hysteretic control. And phase lag of current loop with high switching frequency is quite small that makes current loop equivalent power stage be a proportional component . The conclusion is also valid in large signal analysis. Then an averaged linear model of a single phase inverter is derived. The system closed loop characteristic equation order is reduced due to hysteretic current control introduced. And compensation principles of the single phase inverter are investigated with