一种新型光伏并网逆变器同步控制策略

为使光伏并网逆变器能够实时跟踪电网电压,需要对逆变器实施一种合理的同步控制.常用的无差拍控制具有瞬时响应快、精度高等特点,但是其自身鲁棒性差,难以抑制非线性负载干扰信号的扰动,重复控制可以精确跟踪电网波形,有效抑制谐波,缺点是控制指令总会滞后一个周期输出,动态响应慢.基于此,提出了一种复合同步控制策略,建立了仿真模型,并在仿真软件Matlab/Simulink下进行了仿真实验.结果表明,该控制策略相比常用的控制方法精度高、稳定.它即提高了系统的响应速度又完善了输出波形,并且可以有效抑制非线性干扰信号的扰动.证明了新型复合同步控制策略在光伏并网逆变器中应用的可行性.

A Novel Photovoltaic Grid-connected Inverter Synchronization Control Strategy

In order to achieve real-time tracking of the grid voltage for the PV grid-connected inverter,it is meccessary to implement a reasonable synchronization control on the inverter.Commonly used deadbeat control with fast transient response and high accuracy,but it is difficult to suppress the interference signal of the non-linear load disturbance because of its own poor robustness.Repetitive control can accurately track the grid waveform and effectively suppress harmonics,but the disadvantage is that the control command will lag aperiodic output and slow dynamic response.Based on this,this paper proposes a composite synchronization control strategy,simulation model,and simulation software Matlab/Simulink.Simulation experiment results show that:the control strategy is highly precisive and stable when compared to the commonly used control method.Furthermore,it can improve the system response speed,perfect output waveform,and effectively suppress the the nonlinear interference signal disturbance.It is proved the feasibility of new composite sync applications in the photovoltaic grid-connected inverter control strategy.