光伏逆变器并网控制策略研究——虚拟同步发电机
Research on Grid-Connected Control Strategy for Photovoltaic Inverters—Virtual Synchronous Generator
摘要: 广泛使用的并网逆变器缺乏惯性和阻尼，无法为电力系统提供合适的频率和电压支撑。针对上述问题研究光伏逆变器并网控制策略，基于三相桥式两电平逆变器的SVPWM调制模型在不同坐标系下建立了三相光伏逆变器的数学模型；根据数学模型，引入改进型虚拟同步发电机控制策略，设计有功环与无功环控制参数整定方法，通过仿真实验进行验证控制策略的优越性。
Abstract: Currently, widely deployed grid-connected inverters lack inertia and damping characteristics, failing to provide adequate frequency and voltage support for power systems. To address these challenges, this study investigates grid-connected control strategies for photovoltaic inverters. The mathematical model of three-phase photovoltaic inverters was established in different coordinate systems based on the Space Vector Pulse Width Modulation (SVPWM) framework of a three-phase bridge two-level inverter. Building upon this mathematical foundation, an improved Virtual Synchronous Generator (VSG) control strategy was introduced, with systematic parameter tuning methodologies designed for both active power loop and reactive power loop controllers. The superiority of the proposed control strategy was conclusively validated through simulation experiments.
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