可调度型光伏逆变器滑模电压控制方法研究

Research on Schedulable Type of Photovoltaic Inverter Sliding Mode Voltage Control Method

为改善小容量户用光伏发电系统中并网逆变器的有功无功调度跟踪性能及并/离网切换控制性能,提出一种逆变器滑模电压控制方案。光伏发电系统并/离网运行情况下逆变器均采用电压控制模式,无需模式切换。采用滑模控制方法实现逆变器电压控制,根据有功无功的调度指令,调节逆变器输出的端电压,实现并网模式下逆变器输出功率灵活快速跟踪调度指令的特性。在Matlab/Simulink仿真平台对所提出的控制方案进行仿真验证。结果表明,所提控制方案简单易行、功率快速跟踪调度指令能力强、并/离网过程迅速无冲击。

In order to improve the active and reactive scheduling and tracking performance and grid-tied / stand-alone mode transfer control performance of inverter for small capacity household photovoltaic（ PV） system,a new sliding mode voltage control scheme was proposed. Inverter adopted voltage control during grid-tied / stand-alone period of PV system,without controlling mode switch. And voltage control was realized by using sliding mode control method. According to the active and reactive power dispatch instructions,the inverter output voltage was adjusted,to realize the inverter output power characteristics of flexible fast track scheduling commands in the grid-connected process. Simulations were carried out in the MATLAB / SIMULINK platform to verify the proposed control strategy.Finally,the results show that the proposed control scheme is simple to realize,can track power instruction quickly,and has no negative impact during rapid grid-tied / stand-alone mode transfer process.