| 摘要: |
| 提出了一种有源电力滤波器的前馈控制策略。基于开关平均模型设计了前馈控制器和电流控制器，并利用功率模型对电压控制器进行了设计。由于电网电压在系统启动时会产生很大冲击电流，通过引入前馈控制有效地降低了作为扰动的电网电压和直流电压对被控电流的影响，提高了系统的动态性能，同时利用直流电压控制环直接获取电流参考信号对电网电流进行控制，简化了控制算法。所提方法无需检测负载电流和逆变器输出电流，且无需锁相环电路，降低了成本。利用模拟器件实现控制电路并进行了实验研究，实验结果证明了所提方法的可行性。 |
| 关键词: 有源电力滤波器 前馈控制 模拟器件 电压控制 电流控制 |
| DOI： |
| 分类号: |
| 基金项目:湖南省科技计划项目（2010FJ3032）；湖南省自然科学基金资助项目（11JJ5034） |
|
| Active power filter based on feed-forward control |
|
TANG Xin, LI Xiongjie
|
|
College of Electrical and Information Engineering，Changsha University of Science and Technology，Changsha 410076，China
|
| Abstract: |
| A feed-forward control strategy is proposed for active power filter. The feed-forward controller and the current controller are designed based on the state-space averaging model and the voltage controller is designed based on the power model. Since the grid voltage may generate big impulsive current during system startup，the feed-forward controller reduces effectively the effect of perturbing grid voltage and DC voltage on controlled current to improve the dynamic performance of system. The reference current for grid current control is directly obtained from the DC voltage control loop，which simplifies the control algorithm. The detection of load current or inverter output current and the PLL（Phase Locked Loop） are cancelled，resulting in low cost. The control circuit is realized with analogue devices and the experimental results demonstrate the validity of the proposed control strategy. |
| Key words: active filters feed-forward control analogue device voltage control electric current control |
