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Synthesizing Averaged Virtual Oscillator Dynamics to Control Inverters with an Output LCL Filter

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Document pages: 6 pages

Abstract: In commercial inverters, an LCL filter is considered an integral part tofilter out the switching harmonics and generate a sinusoidal output voltage.The existing literature on the averaged virtual oscillator controller (VOC)dynamics is for current feedback before the output LCL filter that contains theswitching harmonics or for inductive filters ignoring the effect of filtercapacitance. In this work, a new version of averaged VOC dynamics is presentedfor islanded inverters with current feedback after the LCL filter thus avoidingthe switching harmonics going into the VOC. The embedded droop-characteristicswithin the averaged VOC dynamics are identified and a parameter designprocedure is presented to regulate the output voltage magnitude and frequencyaccording to the desired ac-performance specifications. Further, a powerdispatch technique based on this newer version of averaged VOC dynamics ispresented to simultaneously regulate both the active and reactive output powerof two parallel-connected islanded inverters. The control laws are derived anda power security constraint is presented to determine the achievable powerset-point. Simulation results for load transients and power dispatch validatethe proposed version of averaged VOC dynamics.

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