基于分布式发电的微电源本地非线性负载控制研究

Study of the Micro-source Control under Nonlinear Load Basing Distributed Generation

微电网内微电源可能离负载极近,电源输出直接受非线性负载影响。常规逆变器带非线性负载采用PI控制时,系统控制精度不高,对系统参数摄动的鲁棒性不强,抗负载扰动能力有限。为了改善微电源逆变器控制系统的动态性能,降低逆变器控制设计硬件和软件成本,针对微电源逆变器带载非线性负载模型,提出利用现代控制理论中的滑模变结构控制策略,设计了基于滑模变结构的三相电压闭环微电源逆变器控制系统。进行了系统的仿真分析,结果表明,微电源能够输出较好的电压波形。

Micro-power in micro-grid may be very close to the load,power output is directly affected by the nonlinear load.When conventional inverter with nonlinear loads using PI control,the system control accuracy is not high,the robustness of the parameter perturbation is not strong,and the ability of anti-load disturbance is limited.In order to improve the dynamic performance of micro-power inverter control system,reduce the inverter control hardware and software costs,for the micro power inverter model with nonlinear load,proposed the use of sliding mode variable structure control strategy within modern control theory,based on sliding mode three-phase voltage closed-loop micro-power inverter control system is designed.Through system simulation analysis,the results show that the micro-power can supply better voltage waveform output.