LCL滤波单相并网逆变器的控制设计

针对LCL滤波器较低的阻尼易使系统不稳定以及分布式发电需满足并网标准的问题,从直流母线电压控制、阻尼和电流控制及电网同步化等方面对并网逆变器进行研究。改进的直流母线电压控制增加了电压的控制带宽和动态性能,使系统具有较好的阻尼效果,而且易于闭环控制系统的设计,电网同步控制使并网电流近似一致地跟踪电网电压。仿真分析表明,所设计的逆变器可行、有效。

Control Design of the Single Phase Grid-Connected Inverter with an LCL Filter

In tearms of the problems that the LCL filter with low damping makes the system instabe easily and the distributed generation need to meet the standard of grid-connected.By studying the grid-connected inverter from the aspects of the DC bus voltage,damping and current as well as the grid synchronous control.The improvement of the DC bus voltage control increases the control bandwidth and the dynamic performance of voltage.The combination between the passive and active damping control and weighted current control not only makes the system have a good damping effect,but also makes it easy to design the closed loop system.The grid synchronous control ensures that the grid current can be consistent with the grid.voltage approximately.The simulation analysis also shows the feasibility and effectiveness of the inverter designed in this paper.