Design of output filter for inverters using fuzzy logic |
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| Authors: | Chin-Hsing Cheng |
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| Affiliation: | 1. LEVRES Laboratory, Electrical Engineering Department, El Oued University, El Oued 39000, Algeria;2. LGBE Laboratory, Electrical Engineering Department, Biskra University, Biskra 07000, Algeria;3. Department of Electrical and Computer Engineering, Texas A&M University at Qatar, Education City, Doha 23874, Qatar;1. Universidade Federal do Rio de Janeiro (UFRJ), RJ, Brazil;2. Pontifcia Universidade Catlica do Rio de Janeiro (PUC), RJ, Brazil;3. Lisbon University Institute- ISCTE-IUL & ISTAR-IUL, Lisbon, Portugal;4. University of Massachusetts Amherst, Dept. of Electrical and Computer Engineering, USA |
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| Abstract: | This paper proposes a design method to improve the harmonic of output voltage of a single phase inverter with an L-C output filter using fuzzy logic controller (FLC). In practice, the harmonic characteristics of circuits are complicated and entangled. There are two kinds of harmonic sources that cause inverter output voltage waveform distortion: One is the PWM switching of inverter and the other is the nonlinear characteristics of the load. In general, PI feedback control by coefficient diagram method (CDM) is used to design the output voltage filter. The relation between the L-C value and the system time constant are described with the closed form and the filter values must be calculated repeatedly to satisfy the prescribed voltage total harmonic distortion (THD) of the system. Therefore, the MATLAB Fuzzy Logic Toolbox for the fuzzy logic control algorithm is proposed. The L-C value of the filter can be set to a fixed range in the nonlinear characteristic of the practical condition, to improve the harmonic of output voltage more effectively and to avoid repeated calculation. |
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