Research on AC/DC Hybrid Control Strategy for Distribution Transformer Area with Photovoltaic Access

In order to maintain stable bus voltage within the distribution station and realize steady power output regulation of its AC-DC microgrid, as well as address the severe PV abandonment and low photovoltaic utilization issues existing in the distribution station, this study puts forward an AC/DC hybrid control scheme designed for photovoltaic integration on the distribution station side. When operating under grid-connected conditions, the DC-side photovoltaic units run with maximum power output, energy storage batteries are responsible for stabilizing DC bus voltage, and the AC microgrid applies PQ control. For islanded operation modes, all distributed micro-source and converter adopt droop control to keep the AC grid’s voltage and frequency within normal ranges; energy storage batteries paired with corresponding controllers stabilize DC bus voltage, which supports the hybrid microgrid to operate stably under various working scenarios. The proposed hybrid AC/DC control scheme for PV-connected distribution station microgrids is verified via model establishment and simulation tests. Simulation outcomes reveal that the presented control scheme can properly manage power exchange between different grids, raise the utilization efficiency of photovoltaic generation, and guarantee the voltage and frequency stability of the microgrid located on the distribution station side.(与中文对应)