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A photovoltaic inverter control strategy based on the virtual impedance method is proposed, which makes the inverter compensate the harmonic of power grid to achieve the purpose of harmonic suppression while the inverter transmit the active power to the grid. An algorithm of finding the best virtual impedance is designed. The search range of the virtual impedance is determined by estimating the equivalent...
This paper proposes a method to find the equivalent circuit parameters, moment of inertia, and friction coefficient of an induction machine. The reference data include time-varied signals of voltage, current and rotor speed. By the time-varied voltage and current, a time-varied impedance can be found. The parameters of equivalent circuit can be found from the variation of impedance to the rotor speed...
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