A quick solution to optimal coordinated voltage control based on dimension-reduction of power system through modified Ward-PV

Abstract

Voltage control and voltage stability are the two most important issues in power systems. Accordingly, the current study primarily aims to investigate the emergency voltage control in power systems. In this regard, one of the most important methods proposed to solve this problem is Optimal Coordinated Voltage Control (OCVC), which operates based on Model Predictive Control (MPC). In order to solve an OCVC problem, time limitations are taken into account to prevent voltage collapse as the most critical constraint. In this research, modified Ward-PV was proposed to reduce the dimensions of the power system and consequently solve the problem faster. In this method, immediately after a fault occurrence, the power system is partitioned into three subsystems based on spectral graph partitioning method. Partitioning in this method is done based on the reactive power ow through the lines. The subsystems, which are far from fault, will be replaced by the reduced model. This method would in turn drastically reduce the number of system equations and boost the process of problem-solving. The results of simulations obtained from New England IEEE 39-Bus System revealed that the function of the proposed method was more precise than that of the dimension reduction method of the power system based on linearization of external subsystems. However, it impeded the process of problem-solving.