Abstract
Three phase grid connected inverters are commonly used in micro-grids as interphase between dc and ac systems. Traditionally, grid connected inverters (GCI) are controlled through standard decoupled d–q vector control mechanisms using proportional integral (PI) controllers. However, recent studies have indicated their limitations when applied to dynamic systems. For instance, PI controllers are unable to give optimal performance when the system operating conditions change. How such restrictions can be overcome using an adaptive self-tuning controller instead of a PI controller is investigated in this paper. A controller based on recursive least squares identification and pole shifting control is designed and implemented on the GCI in a micro-grid test system. Performance of the conventional and proposed controllers is compared and evaluated. The proposed controller outperformed the conventional controller in all test cases simulated, and showed robust and stable performance for a wide range of operating conditions.
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