期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2015
卷号：73
期号：3
出版社：Journal of Theoretical and Applied
摘要：This paper presents the parameter optimization of proportional integral (PI) controller in four-leg inverter for DG application when installed in a three-phase four-wire distribution system. The inverter can be utilized as power converter to inject power generated from renewable source to the grid and as shunt active power filter to compensate load current harmonics, load reactive power demand, and current unbalance. To achieve those functions, a reference current needs to be determined. In this study, DC voltage regulator used PI controller to generate the peak value of reference grid current. Optimal tuning of PI gain was required to obtain the best performance of PI controller. An algorithm based on the ant colony optimization (ACO) method was used to optimize the PI parameters. The objective function of optimization was to minimize the integral time absolute error (ITAE) of dc-link voltage and average total harmonic distortion of grid currents (THDiave). The usefulness of the approach was demonstrated by a simulation.
关键词：Grid-Connected Inverter; PI Controller; ACO; ITAE; THDi
