中文摘要：

并网逆变器的控制是分布式发电并网的一项关键技术。以两级式LCL型三相光伏并网逆变器的控制策略为核心研究对象,设计了三相光伏并网逆变器的控制系统结构;建立了基于LCL滤波器的三相并网逆变器模型;提出了一种新的并网逆变器的控制策略;对基于SVPWM的LCL型三相光伏并网逆变器控制系统进行了设计;在Matlab/Simulink环境下建立了系统仿真模型。仿真和实验结果表明,并网电流谐波分量少,系统工作稳定,验证了所提出控制策略的正确性与有效性。

英文摘要：

Grid-connected inverter control is a key technology of distributed generation. The control strategy of three-phase photovoltaic grid-connected inverter of LCL type in the two-stage style was focused; the control system structure of three-phase photovoltaic grid-connected inverter was designed; the model of three-phase grid-inverter based on LCL filter was established; a new control strategy of grid-connected inverter was proposed; the control system of LCL type three-phase photovoltaic grid-connected inverter based on SVPWM was designed; the systematic simulated model in Matlab/Simulink environment was created. The simulation and experimental results show that there is less harmonic component in the network, and the system works stably, which can verify the control strategy is correct and effective.