STATCOM预测直接功率控制中参数自适应辨识方法

Predictive-Control-Based Direct Power Control With an Adaptive Parameter Identification Technique for STATCOM

预测直接功率控制技术可以在静止坐标系下,实现有功功率和无功功率的解耦控制,将预测直接功率控制应用到带蓄电池储能系统的静止同步补偿系统(static synchronous compensator/battery energy storage system,STATCOM/BESS)的STATCOM侧,可以实现对有功功率和无功功率的解耦控制,但预测直接功率控制方法依赖于准确的数学模型,而实际系统中STATCOM的数学模型参数容易发生改变,为实现对STATCOM侧等效电路参数的在线辨识,在静止坐标系下建立了STATCOM的最小二乘格式的数学模型,采用带遗忘因子的递推最小二乘法对参数进行在线辨识,自适应修正控制模型的参数,降低输出电流的畸变率,提高补偿精度。最后通过仿真和实验,验证所提的自适应参数辨识方法,可以有效的辨识STATCOM侧的等效电路参数。

With predictive direct power control technology active and reactive power decoupling control can be realized in stationary coordinate system. With predictive direct power control applied to STATCOM side of STATCOM/BESS system, active and reactive power decoupling control can be achieved. Predictive direct power control method relies on accurate mathematical model, but the parameters of mathematical model of STATCOM in actual system are liable to change. In order to realize on-line identification of equivalent circuit parameters in STATCOM side, a mathematical model of STATCOM is established in least square format under stationary coordinate system. With recursive least squares method with forgetting factor for on-line identification of parameters, distortion of output current is reduced, and compensation accuracy is improved. With simulation and experiment, the parameter identification method is verified.