带有过渡过程的一阶自抗扰SAPF并网启动策略研究

Research on the start-up strategy of first-order active disturbancerejection SAPF with transition process

针对传统控制方式下并联型有源电力滤波器(SAPF)并网时引起的电压超调和电流冲击问题。基于保护开关器件和防止电流过大产生的线路过电流保护,通过建立SAPF直流侧数学模型,分析了产生电压超调和电流冲击的原因。在进行以上工作之后,在传统的串联限流电阻启动策略的基础上引入过渡过程和一阶自抗扰控制,设计了一种带有过渡过程的一阶自抗扰SAPF并网启动策略,并验证了一阶自抗扰控制的稳定性。在仿真软件中对所提出的启动策略进行了验证,同时在仿真中与传统的比例积分(PI)控制方法进行了对比,验证了所提出的启动策略的有效性和可行性。最终通过仿真分析,该启动策略可将本系统并网启动过程产生的冲击电流抑制在100 A以内,与传统控制策略冲击电流500 A相比,极大的抑制了冲击电流对电网的损害;并网启动过程产生的电压超调为0,实现了SAPF无冲击启动。

Aiming at the problems of voltage overshoot and current surge caused by parallel active power filter(SAPF) grid connection under traditional control mode. Based on the protection of switching devices and line overcurrent protection from excessive current, the article analyzes the causes of voltage overshoot and current impact by establishing a mathematical model of SAPF DC side. After the above work, the transition process and first-order auto disturbance rejection control are introduced on the basis of the traditional series current limiting resistor start strategy, and a first-order auto disturbance rejection SAPF grid-connected start strategy with transition process is designed, which verifies the stability of the first-order active disturbance rejection control. The proposed startup strategy was verified in the simulation software, and compared with the traditional proportional integral(PI) control method in the simulation, the validity and feasibility of the proposed startup strategy were verified. Finally, through the simulation analysis, this startup strategy can suppress the inrush current generated during the grid-connected startup process of the system within 100 A. Compared with the traditional control strategy of 500 A, the inrush current greatly suppresses the damage to the grid;The voltage overshoot during grid connected startup is 0, and the SAPF has no impact start.