含低压储能模组的光伏并网逆变器研究

A Solar Power Inverter with Low Voltage Storage Devices

针对光伏发电功率波动的问题,提出一种带储能模组的隔离式光伏并网逆变拓扑结构。利用储能模组存储多余的电能,实现平滑并网功率和光伏电池板的最大功率跟踪。针对提出的拓扑结构,分析其工作原理和开关状态,讨论储能模组剩余电量的控制算法,建立控制算法和调制策略。实验结果表明,提出的拓扑并网逆变器可实现内部直流电压控制,完成并网运行,提出的控制策略和调制算法正确可行。

To minimize the power vibration of the solar power generation,this paper proposes the topology of isolated PV grid-connected inverter with storage devices,in which the excess energy can be stored in storage devices and the maximum power point tracking（ MPPT） of smooth grid power and PV panels can be accomplished. For the proposed topology,we analyze its working principle and switching patterns are analyzed,and the control algorithm is discussed for the residual quantity of storage device,so as to establish the control algorithm and modulation strategy. The experimental results show that the proposed topology of grid-connected inverter can realize the internal DC voltage control and the complete grid connection; the proposed control strategy and modulation algorithm are proved correct and feasible.