单相光伏并网逆变器控制策略的比较研究

采用单相两级式光伏并网拓扑结构，针对传统双闭环控制策略，在光伏电池输人功率发生骤变时，响应滞后，系统稳定性较差的缺点，采用带有输入功率前馈的双闭环控制策略，并对其进行详细地分析。通过上述的分析，基于MATLAB平台，分别就两种策略搭建了光伏并网系统的仿真模型。仿真结果表明，当输入功率发生突变时，相对于传统双闭环控制策略，带有功率前馈的双闭环控制策略，其并网电流能够更快地达到新的稳定，同时降低了直流母线电压在该过程中的波动，具有更优越的动态性能。

Comparative Study of Two Control Strategies for Single-Phase Photovoltaic Grid-Connected Inverters

On the basis of the two-stage single-phase PV grid-connected topology, the slow response and low stability of the traditional double-closed loop control strategy which occur when the PV input power changes suddenly, are analyzed in detail using the power feed-forward double-closed loop control strategy. According to the analysis, two simulation models of the PV grid-connected system with two different control strategies are built in the MATLAB platform. The results show that the control strategy with input power feed-forward has more excellent dynamic response in the respects of the output current and DC-BUS voltage.