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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。
This paper presents an adaptive dead-beat control method for static synchronous compensator (D-STATCOM) in distribution system under static coordinate system. First of all, aiming at the problem that traditional D-STATCOM deadbeat control model has large error when the switching frequency is low, the grid voltage in a switching cycle is considered as the variation, and a new D-STATCOM No beat control model. Secondly, in order to overcome the influence of D-STATCOM parameter variation on the performance of the compensator, the least squares method is used to estimate the parameters online and adaptively adjust the control model to improve the compensation accuracy. In addition, in order to meet the requirements of the control method for predicting the compensation current reference and grid voltage, a composite prediction method is proposed to effectively improve the accuracy and dynamic performance of the prediction algorithm. Simulation and experimental results show that the proposed control method has the characteristics of high control accuracy and fast response.