A systematic study of system-wide automatic coordinated voltage control for TNB system

The voltage and reactive power (VAR) management in the power system operation has becoming more challenging than ever. This is mainly due to long distance of power generations to the load centers and mesh interconnection of power grids. Coordinated Voltage Control (CVC) is found to be the most effective solutions for voltage and VAR control. This can be achieved by coordinating reactive power resources at transmission system to achieve a better voltage profiles and to minimize active power losses. This paper presents a systematic study of a hierarchical structure of system-wide automatic Coordinated Voltage Control for TNB system. Through a collaboration between TNB Research and Tsinghua University, a comprehensive simulation study of CVC system based on the approach developed by Tsinghua University has been carried out. The simulations are based on the recursive power flow solutions of the real-time snapshots which are obtained from TNB Energy Management System (EMS). The simulation results on Adaptive Zone Division (AZD), Tertiary Voltage Control (TVC) and Secondary Voltage Control (SVC) are presented in this paper. Furthermore, voltage profiles, system losses and VAR reserves before and after CVC are being analyzed. The results are encouraging. Therefore, the implementation of an automatic CVC system in TNB power grid is being realized.