静止坐标系下D-STATCOM自适应无差拍控制

Adaptive Deadbeat Control in Stationary Reference Frame for D-STATCOM

提出一种静止坐标系下配电网静止同步补偿器(D-STATCOM)的自适应无差拍控制方法。首先针对传统的D-STATCOM无差拍控制模型在开关频率低时存在较大误差的问题,将一个开关周期内的电网电压作为变化量来考虑,建立了新的静止坐标系下的D-STATCOM的无差拍控制模型。其次,为了克服D-STATCOM参数变化对补偿器性能的影响,利用最小二乘法进行参数的在线估计,以自适应修正控制模型,提高了补偿精度。另外,为了满足该控制方法对补偿电流参考值和电网电压进行预测的要求,提出一种复合预测方法,有效地提高了预测算法的精度和动态性能。仿真和实验结果表明所提出的控制方法具有控制精度高、响应速度快的特点。

An adaptive deadbeat control method in stationary reference frame for distribution level static synchronous compensator （D-STATCOM） is proposed. Firstly, in order to reduce the compensation error of D-STATCOM with traditional deadbeat controller when switching frequency is low, a new mathematical model for deadbeat controller is constructed. In this model, the line voltage is taken as a variable instead of constant in one switching period. Secondly, to cancel the effect of parameter deviation on compensation performance and hence to improve the performance, a parameter estimation method based on the least mean square （LMS） algorithm is applied. The estimation value of the parameters is used to adjust mathematical model of deadbeat controller adaptively. Finally, a hybrid prediction method is proposed to predict reference current and line voltage, which is important and necessary for deadbeat controller. The prediction method proposed provides good dynamic performance and high precision. Simulation and experiment results show that the proposed adaptive deadbeat control method can obtain high accuracy and fast resnonse.