REACTIVE POWER SHARING METHOD FOR PARALLEL INVERTERS BASED ON VIRTUAL IMPEDANCE AND DYNAMIC DROOP COEFFICIENT
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United States of America
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Mar 20, 2025
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Sep 19, 2023
filing date -
Sep 19, 2023
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Abstract
The present invention discloses a reactive power sharing method for parallel inverters based on virtual impedance and a dynamic droop coefficient. The virtual impedance is constructed through the parameter design of voltage and current double-closed loop controllers and a line impedance observer, to realize power decoupling. A dynamic droop coefficient is constructed to adjust the output voltage of a virtual synchronous generator adaptively, and the output reactive power of inverters is controlled indirectly to achieve reactive power sharing according to capacities. The present invention does not need a communication network between the inverters, and only needs the local variable information of each inverter, so that a microgrid has the function of “plug and play”.
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