滞环电流控制逆变器建模及分析  

Modeling and Analysis of Inverter With Hysteretic Current Control

作　　者：王建华[1] 张方华[1] 龚春英[1] 刘磊[2] 

机构地区：[1]南京航空航天大学航空电源航空科技重点实验室,南京210016 [2]南瑞继保电气有限公司,南京211102

出　　处：《电工技术学报》2010年第6期63-69,共7页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973项目)(2007CB210303);台达环境与教育基金会<电力电子科教发展计划>(DRE02006007)资助项目

摘　　要：基于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线性模型,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。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 Routh criteria, which make a good comprise between stability and stable/dynamic performance.

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 

分 类 号：TM464[电气工程—电器]