Abstract 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.
Zheng Chunfang,Zhang Bo,Qiu Dongyuan等. The Harmonics-Injection SPWM Technique Based on the Inverse Operator Method[J]. Transactions of China Electrotechnical Society, 2012, 27(11): 191-196.
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