Enhancing the performance of the voltage source inverters (VSIs) without changing\nthe hardware structure has recently acquired an increased amount of interest. In this study,\nan optimization algorithm, enhancing the quality of the output power and the efficiency of\nthree-phase grid connected VSIs is proposed. Towards that end, the proposed algorithm varies\nthe switching frequency (fsw) to maintain the best balance between switching losses of the\ninsulated-gate-bipolar-transistor (IGBT) power module as well as the output power quality under\nall loading conditions, including the ambient temperature effect. Since there is a contradiction\nwith these two measures in relation to the switching frequency, the theory of multi-objective\noptimization is employed. The proposed algorithm is executed on the platform of Altera�®\nDE2-115 field-programmable-gate-array (FPGA) in which the optimal value of the switching\nfrequency is determined online without the need for heavy offline calculations and/or lookup\ntables. With adopting the proposed algorithm, there is an improvement in the VSI efficiency without\ndegrading the output power quality. Therefore, the proposed algorithm enhances the lifetime of\nthe IGBT power module because of reduced variations in the moduleâ��s junction temperature. An\nexperimental prototype is built, and experimental tests are conducted for the verification of the\nviability of the proposed algorithm.
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