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基于光伏接入台区侧交直流混联控制策略研究

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

  • 摘要: 为稳定台区侧母线电压,调控台区侧交直流微网的功率输出恒定,改善台区光伏高弃光率、低利用率的现状,提出一种基于光伏接入台区侧交直流混联控制策略。在并网模式时,直流侧光伏以最大功率输出,储能电池稳定直流母线电压,交流侧微网采用PQ控制;在孤岛模式时,各微源和变换器采用下垂控制维持交流子网的频率、电压,储能电池和控制器维持交流母线电压,实现多工况下微网的可靠运行。通过对光伏接入台区侧交直流混联控制策略进行建模与仿真验证,结果表明,该控制策略能有效控制子网间功率流动,提高光伏利用率,保障台区侧微电网电压与频率稳定。

     

    Abstract: 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)