静止同步串联补偿器的变结构控制器设计

Design of Variable Structure Controller Used in the Static Synchronous Series Compensator

为了提高静止同步串联补偿器的稳态性能和补偿灵活性,采用变结构控制设计其控制器,整个设计基于对输电线路电流的锁相。由于SSSC的数学模型在dq坐标下是一个非线性强耦合系统,文中采用基于非线性反馈的逆系统方法将原系统进行线性化解耦,构造出其伪线性模型,设计出伪线系统的变结构控制律,对直流侧的隐动态采取PI控制。最后建立SSSC的仿真模型对其进行仿真试验并同PI控制进行了比较。结果表明本控制策略的高效性。

In order to enhance the steady state performance and the compensative flexibility of SSSC,a variable structure control was used in its controller designing.The process based on phase-locked of the current in transmission line.Because SSSC was a coupling nonlinear system in a synchronous rotating dq coordinate,a nonlinear feedback linearization theory is employed to linearize original nonlinear system and uncouple it.The inverse system model of SSSC was deduced and a pseudo linear system was constructed.Then the controller was designed by variable sturcture control theory and the hidden dynamic of DC side voltage was resolved by PI.Finally,The simulation model of SSSC comparing with PI controller proved the effectiveness of the proposed control strategy.