基于干扰观测补偿的配电变压器集成式STATCOM改进无源控制策略

Passive Control for Distribution Transformer-static Synchronous Compensator Based on the Disturbance Observer

配电网中广泛使用的配电变压器是电能供给需求与电能质量控制的关键设备,针对配电变压器集成式静止同步补偿器(static synchronous compensator,STATCOM)系统结构,文章提出了一种基于干扰观测补偿的改进无源控制策略(disturbance observer based PBC,DOPBC)。首先,建立抽头注入式配电变压器的数学模型,得到了抽头注入式配电变压器在相坐标下的节点导纳矩阵及等值电路;其次,针对系统中的参数摄动和扰动等因素导致无源控制鲁棒性变差的问题,提出了一种基于干扰观测补偿的改进无源控制策略,通过干扰观测器(disturbanceobserver,DO)估计系统扰动,抵消参数变化对无源控制器的影响,从而提高系统的抗干扰性能,并证明DOPBC的稳定性;最后,通过仿真和实验验证该方法的有效性和可行性。实验结果表明,所提DOPBC策略在实现指令值零误差跟踪的同时能获得良好的动态性能,并且对系统参数摄动和扰动具有较强的鲁棒性。

The widely used distribution transformer is a joint of power supply,requirement and power quality control in distribution network.This paper proposed a novel passivitybased control based on the disturbance observer(DOPBC)for Distribution Transformer-Static Synchronous Compensator(DT-STATCOM).In this paper,the mathematical model of winding taps injection transformer was first established.Based on this,the node admittance matrix and the equivalent circuit of DT-STATCOM in phase coordinates were also deduced.For the influence of parameters perturbation on conventional passivitybased control(PBC),a disturbance observer(DO)to estimate disturbances was designed,which is treated as feedforward compensation for PBC to overcome the negative effects of the uncertainties,thus improving the robustness of the controller system.Moreover,the stability of the proposed DOPBC was proved.The effectiveness and feasibility of DOPBC were verified by simulations and experiments.The theory analysis and the experiment results show that the proposed control strategy can achieve good dynamic performance while ensuring the accurate tracking of the reference values,and has strong robustness to parameters perturbation and disturbance.