状态PI调节器在D-STATCOM双闭环控制中的应用

Double closed loop control for distribution static synchronous compensator based on state PI feedback control

针对D-STATCOM的强耦合特性,分析D-STATCOM的系统构成,在构建dOq坐标系下D-STATCOM系统数学模型的基础上,将基于状态PI调节器的最优跟踪控制策略和模糊自适应PI控制分别应用于D-STATCOM系统的电流内环和电压外环控制。研究结果表明:该控制策略使系统的无功电流和有功电流都具有很好的动态和稳态响应,在3 ms内即可达到稳态,且稳态时电流误差为0 A;在无功负荷突加时系统时响应速度快,所需时间大约为3个工频信号周期;该控制策略性能优良,结构简单,容易实现,满足D-STATCOM电压补偿的要求。

Considering coupling characteristics of the mathematic model of D-STATCOM,configuration of D-STATCOM was analyzed and the mathematic model in the dOq coordinate was constructed.The state PI feedback control method based on optimal tracking control was adopted in the inner loop current control and the fuzzy adaptive PI controller was used in the outer loop voltage control.The results indicate that the system has a good dynamic and steady state response to active and reactive current using the control strategy,the steady-state can be reached in 3 ms and the steady-state error is 0 A.It also has an excellent response time about 3 frequency current when sudden reactive load is added.The control strategy proposed has excellent performance and is easy to be used.