摘要
从逆变器的建模和控制入手,针对电容(电感)电流内环和负载电压外环双环PI控制存在的缺点,提出了电流内环采用电感电流瞬时反馈和负载扰动前馈相结合的PI控制,电压外环采用PR控制的改进策略。根据改进的双环控制策略建立了逆变器的控制系统模型,利用极点配置法设计了控制器参数,并对控制系统进行了频域特性分析。最后,在Matlab中对单相电压型PWM逆变器改进控制策略进行了Simulink仿真,仿真结果表明:系统设计合理,改进控制策略效果良好。
Starting from the modeling and control of the inverter, an improved strategy is proposed with the inner current loop using PI controller which combines the inductor current instantaneous feedback strategy and load disturbance feed-forward tactics, and the outer voltage loop using PR controller, aiming at the disadvantages of dual-loop control using PI controller with inner current control loop including inductor current feedback or capacitor current feedback and outer voltage control loop. A control system model for this inverter is established on basis of the improved double loop control strategy, and the controller parameters is designed using the pole assignment method. Moreover, the characteristics of control system are analyzed in frequency domain. Finally, according to the improved control strategy, the single-phase voltage-type PWM inverter is simulated in Matlab, and the simulation results show that the system is designed reasonably and the improved control strategy has a good performance.
出处
《电测与仪表》
北大核心
2014年第8期69-74,共6页
Electrical Measurement & Instrumentation
基金
国家自然科学基金面上基金资助项目(51277137)
关键词
PWM逆变器
PR控制
负载扰动前馈
极点配置
建模仿真
PWM inverter, PR control, load disturbance feed-forward tactics, pole assignment, modeling andsimulation
