Abstract
This paper investigates the performance analysis problem of off-grid three-phase inverters under the conventional double closed-loop PI control. A visual and general performance analysis scheme is proposed on the basis of the D-partition method, devoted to the control parameter turning for high-performance three-phase inverters. The proposed analysis scheme is able to draw the whole stable region related to the control parameters. Moreover, by embedding a gain-phase margin tester into the inverter system, the stable region under specified frequency-domain specifications is obtained, which facilitates the parameter selection for specific performance requirements.
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