摘要
采用LCL方式滤波的单相光伏并网逆变器,有利于抑制高频开关谐波电流进入电网,滤波效果明显优于单电感滤波方式。但LCL滤波器是无阻尼的三阶系统,容易发生谐振现象。文中采用有源阻尼方案,即在并网电流和电容电流双闭环的方法增加系统阻尼。对电流双闭环控制方案进行系统建模和稳定性分析,并用Matlab/Simulink软件进行仿真验证,验证成功后搭建以TMS320F2808DSP为主芯片的代码模型,再进行IQ数据转换和采样电路后的仿真验证,然后利用RTW功能自动生成控制算法代码。实验结果表明,该方案可有效地避免进网电流谐振和实现进网电流的高功率因素,大大缩短算法的开发周期。
Adopting a LCL filter based single-phase photovoltaic grid-connected inverter has the characteristics of high frequency attenu- ation, and the filtering effect is better than single inductor. However, LCL filter is a three order system without damping and easy reso- nance. Based on the active damping scheme, that is, double-loop control strategy with grid current feedback and capacitor current feed- back is proposed for increasing the damping of system. System modeling and stability analysis is presented, and the system is carried on simulation with the Matlab/simulink software. After successfully doing it,code model should be set up with the DSP of TMS320F2808. Meanwhile,it should convert the data, add the sampling circuit, and automatic generates code of the control algorithm based on RTW to verify it. The simulation and experiment results prove that the resonance of grid current is avoided, and high in-grid power factor is a- chieved and it shortens the developing time.
出处
《计算机技术与发展》
2013年第9期143-146,共4页
Computer Technology and Development
基金
福建省自然科学基金项目(2012J01257)
