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| Analysis of Freguency Alias of Digital Controlled Inverters and Its Suppression Method |
| Li Rui, Liu Bangyin, Duan Shanxu |
| State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan 430074 China |
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Abstract The digital controlled inverter system inevitably has the problem of frequency aliasing which brings deterioration of system power quality. This paper focuses on the relationship between the frequency, amplitude and phase angle of aliasing signals and the original signal. Then the frequency aliasing phenomenon of single phase inverter under SPWM is analyzed, and the influence of sampling filter, the time of the A-D conversion and the time of control algorithms on the aliasing signal are revealed. On the basis of the above quantitative analysis, this paper presents a selective delay sampling and complementary sampling scheme to suppress aliasing signal generated by the system. Experiments verify the effectiveness of these two programs.
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Received: 24 May 2012
Published: 25 March 2014
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2013, Vol. 28 
