摘要
由于描述谐波注入式SPWM(简称HISPWM)的数学模型是超越方程,采用常规数值解法求解需要花费较长时间,不适用于数字化实时控制。本文以注入3次谐波的SPWM为例,利用逆算符法求出它们相应的解析表达式,并给出了在不同载波比下3次谐波注入式SPWM开关点解析表达式的精度分析实例。结果表明,3次谐波注入式SPWM开关点解析表达式是由无穷项Adomian多项式表示,可以根据需要的计算精度要求选择合适的Adomian多项式项数求解3次谐波注入式SPWM的开关时刻,为谐波注入式SPWM更有效的实际应用提供了理论依据。
It is difficult to apply natural-sampled harmonic-injection SPWM (HISPWM) method in digital real-time control because its switch-points are expressed in transcendental equations. This paper tries to deduce the analytical expression of the third harmonic injection SPWM's switch- points by inverse operator method, and gives the precision analysis examples for the analytical solutions of natural-sampled HISPWM's switchpoints at different carrier ratio.,The results show the switch-points can be expressed in a series of adomian polynomials. The precision of HISPWM switch-points is depended on how many adomian polynomial terms are used in the calculation, which provide theoretical basis for the application of HISPWM efficiently in practice.
出处
《电工技术学报》
EI
CSCD
北大核心
2012年第11期191-196,共6页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点资助项目(50937001)
关键词
逆变器
自然采样SPWM
谐波注入式SPWM
逆算符方法
Inverters, natural-sampling SPWM (NSPWM), harmonic-injection SPWM (HISPWM), inverse operator method