Pre-Synchronous Control Strategy for Micro-Grid Inverter of dispatchable Virtual Oscillator Control
In the process of microgrid grid-connected switching,because the frequency and voltage on the inverter side and the grid side are not synchronized,there will be problems such as power fluctuations and inrush currents dur-ing the grid-connected process.Therefore,a microgrid grid-connected pre-synchronous control strategy is proposed which obtains the amplitude and angular frequency compensation values based on the SSRF-SPLL on the basis of in-verter dispatchable virtual oscillator control.It can correct the reference voltage vector and then perform grid-connect-ed operation after the voltage synchronization on both sides of the switch,so as to realize the smooth grid-connected switching of the microgrid.The simulation results show that dVOC can provide superior voltage and frequency support characteristics as a grid-forming inverter in the isolated state.The proposed pre-synchronization strategy not only suppresses the transient impact at the moment of microgrid connection,but also maintains power balance,which is conducive to the stable operation of microgrid.
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