【摘要】 针对光储电站黑启动过程中存在的母线电压冲击过大、多光伏逆变器相位不同步等问题，研究光储微电网结构和微源控制方式，提出变d轴母线电压参考值的改进V/f控制策略。基于构网型虚拟振荡器，设计三相电路多并联逆变器并网自同步控制拓扑和策略。建立微电网仿真模型，提出不同工况下黑启动过程母线升压、光伏逆变器相位同步、微电网功率平衡实验方案。结果表明，基于提出的控制策略和拓扑，不同工况下弱电网黑启动过程的母线电压冲击减低，冲击电压由额定电压的5%降至2%以内；并联逆变器相位不同步程度减少，多逆变器最大相位差降至1%以内；储能单元0.03 s内可快速响应光伏功率和负载变化，黑启动过程平稳实现。更多还原

【Abstract】 Aiming at the problems such as excessive impact of bus voltage and unsynchronized phase of multiple PV inverters during the black-start process in the solar-storage farm, the structure of solar-storage microgrid and micro-source control mode are studied. An improved V/f control strategy with variable d-axis bus voltage reference value is proposed to reduce the bus voltage impact during black start process. Based on the grid-forming virtual oscillator, the self-synchronization control topology of multiple parallel inverters with three-phase circuit are developed. An independent microgrid model is established. The tests of the bus boost, the PV inverter phase synchronization and the microgrid power balance are designed under different working conditions to verify the effectiveness of the control strategies. The results show that based on the designed control strategy and the structure, the bus voltage surge during the black start process can be reduced to within 2% of the rated voltage from original 5%. The unsynchronization degree of parallel inverters is also reduced. The maximum phase difference of multiple inverters is decreased to less than 1%; and the energy storage unit can quickly respond to photovoltaic power and load changes within 0.03 s. The black start process can be smoothly realized.更多还原