| Summary: | 碩士 === 義守大學 === 電機工程學系 === 103 === Traditional PID (proportional-integral-derivative) controllers have been broadly applied to single-phase inverters due to their simple structures and easy designs. Yet, the integral term of traditional PID controllers is based on rectangular integration. If the load of the inverter is highly non-linear, the precision of calculations will be low, and there will be steady-state errors. This thesis proposed a PID controller based on trapezoidal integration. Unlike rectangular integration, trapezoidal integration does not underestimate the error area, which can further result in calculation errors. Thus, the proposed single-phase inverter can achieve low total harmonic distortion (THD) output voltage and fast dynamic response. The problem with inverters using traditional PID controller of possible tracking errors in cases with highly non-linear loads can be resolved. To verify the effectiveness of the proposed controller, this thesis used the software MATLAB to run simulations. And the results showed that the AC output voltage of the proposed single-phase inverter is of high quality in any case with resistive load, step load change, or non-linear load.
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