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摘要
The traditional energy storage inverter can only compensate the harmonic current generated by the specified nonlinear load，but cannot reduce the original harmonic content of the power grid. Therefore，the suppression effect of parallel resistance on harmonic voltage at the PCC（Point of Common Coupling）and system resonance is analyzed，and the control strategy of virtual harmonic resistance-type energy storage inverter is proposed. For fundamental wave，the energy storage inverter can still achieve normal charging and discharging function. For harmonics，the energy storage inverter is controlled to output harmonic current，whose magnitude is proportional to the magnitude of harmonic voltage and whose phase is opposite to that of harmonic voltage. In this case，the inverter is equivalent to a virtual harmonic resistance，which can absorb harmonic power and suppress harmonic voltage at the PCC. Considering the resonance，the perturbation and observation method is used to adjust the virtual harmonic conductance automatically so that the energy storage inverter can absorb the maximum harmonic power. The simulative and experimental results show that the virtual harmonic resistance-type energy storage inverter can realize good harmonic governance function while charging and discharging normally. ? 2022 Electric Power Automation Equipment Press.
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