针对电网中的三相四线制系统，本文设计了一种光伏并网发电与有源电力滤波器的统一控制策略，新的系统结构和控制策略使得光伏系统在向电网注入有功电能的同时，还能够对电网无功、谐波以及不平衡电流进行补偿，并且在夜间光伏电池不能发电时，系统能够继续工作在电能质量调节器的状态。同时为了改善并网电流控制方式的不足，文中还设计了针对三相四线制并网逆变器输出电流的解耦控制策略，用以提高输出电流的质量。仿真结果验证了该设计的正确性和可行性。%For power in the three-phase four-wire system, the unified control strategy of a photovoltaic power generation and active power filter is designed in this paper. The new control strategy makes the PV system not only inject active power into the grid, but also compensate the reactive power, harmonics and unbalanced current, and the system can continue work in the state of power quality conditioner when there is no light in the night. Meanwhile, in order to improve the grid current control deficiencies, this paper also proposes for the three-phase four-wire inverter with output current decoupling control strategy to improve the quality of output current. The simulation results show the correctness and feasibility of the design.
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