中文摘要：

滞环控制的PWM变换器是强非线性环节,难以通过优化控制和常规线性化处理来提高电流控制质量.为此,分析了滞环电流控制原理、谐波线性化方法及系统稳定性,得到了滞环电流控制传递函数模型,时滞和环宽与其他参数的一般关系以及系统自振荡频率的计算方法.根据滞环电流控制的特点,提出了将谐波线性化方法与ITAE优化控制律相结合的方法,以实现对PWM变换器的优化控制.Matlab仿真结果表明了所提出方法的有效性.

英文摘要：

The pulse width modulation（PWM） converter controlled by hysteresis is strong nonlinear link,thus making it difficult to improve current control quality by using optimal control and normal linear processing.Therefore,the hysteresis current control principle,the harmonic linearization and stability are analyzed,and the transfer function of hysteresis current control and the relationships between time-delay,width of hysteresis and the other parameters are obtained.The method combing harmonic linearization and integral time absolute error（ITAE） optimal control to realize the PWM converters＇ optimal control is proposed according to the hysteresis current control＇s characteristics.The Matlab simulation results show the effectiveness of the method.