VSG Circulating Current Suppression Strategy Based on Reactive Voltage Compensation Optimization
In view of the large overshoot and the poor suppression effect of existing suppression strategies,a VSG circula-tion suppression strategy based on reactive voltage compensation optimization is studied.Due to the different distribution of line impedance in parallel systems,there are differences in the output voltage of VSG ports,resulting in circulating cur-rents in the system.Therefore it is necessary to analyze the power transmission characteristics of the system.First the grid-connected circulating current of the inverter is calculated and represented with a three-dimensional image which is then analyzed.Further a synchronous generator model is established,which adjusts the output power of VSG,uses VSG control strategy with voltage compensation for suppression.The desired suppression utility is achieved by adjusting droop coefficient,determining compensation voltage value,and correcting VSG voltage difference to achieve suppression effect.The experimental results show that RG2 and RG1 adjustment by the proposed strategy have the same voltage,effectively controlling the occurrence of overshoot,reducing oscillation,achieving the target voltage in a shorter time,and maintai-ning a more stable state.
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