摘要
为提高换流器稳压输出的动静态性能,须设计性能较优的控制器。分析了换流器的移相脉冲宽度调制(pulse widthmodulation,PWM)原理,对电流连续模式下的静态工作点进行求解,给出了静态工作点下一个开关周期内所有的工作模态。基于状态空间平均法建立了换流器在电流连续模式(continuous conduction mode,CCM)下的小信号数学模型,并基于小信号数学模型设计了带前馈补偿的双闭环比例积分(proportion integration,PI)控制器。试验研究结果表明,在该控制器作用下,突然加载过程中输出电压最大跌落在15%以内,恢复时间在150 ms以内,输出特性较好,从而验证了控制器的有效性。
To improve dynamic and static performance of converter output it is necessary to design a controller with preferable performance. The principle of phase-shift pulse width modulation （PWM） for the converter is analyzed; the static state operating point under continuous conduction mode （CCM） is solved and all operating modes within a switching period are given. Based on state space averaging method a small signal model of converter under continuous conduction mode is established, and according to the small signal model a double closed-loop proportion integration （PI） controller with feedforward compensation is designed. Results of experimental investigation show that by the action of the designed controller the maximum output voltage clip during suddenly loading is less than 15% and it recovers within 150ms, therefore the designed controller possesses good output characteristic and the effectiveness of the controller is verified.
出处
《电网技术》
EI
CSCD
北大核心
2013年第5期1230-1236,共7页
Power System Technology
基金
国家重点基础研究发展计划项目(9 73项目)(2012CB215103)~~
