Investigation of Symmetrical Optimum PI Controller based on Plant and Feedback Linearization in Grid-Tie Inverter Systems

iwan setiawan, Mochammad Facta, Ardyono Priyadi, Mauridhi Hery Purnomo


The DC bus voltage dynamic in grid-tie inverter systems basically is governed by the nonlinear differential equation. However due to its simplicity and feasibility, until now the most commonly strategy used to regulate the DC bus capacitor voltage in those systems is a linear Proportional-Integral (PI) controller. The main aim of this work is to investigate and to compare the performance of the PI control strategies based on two linearization techniques that could be used to regulate the DC bus voltage in the grid-tie inverter systems, namely: plant linearization and feedback linearization technique. To get an optimum response, in this paper, the symmetrical optimum tuning method was chosen to determine the PI controller parameters. By using simulation study, it is shown that the performance of both linearization techniques in response to small changes in power disturbances are almost the same. However in the case of large power disturbances, the performance of the plant linearization based-PI controller is more superior than that based on the feedback linearization technique.

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DC bus; feedback linearization; grid-tie inverter; plant linearization; symmetrical optimum tuning method

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