Control strategy for ± 800 kV 6000 MW NER-Agra Multi-Terminal HVDC Project

The North East Region-Agra HVDC link is the world's first Multi-Terminal Project at ±800 kV, linking rectifier stations at Biswanath-Chariali and Alipurduar, with inverter station at Agra. Multi Terminal HVDC (MTDC) systems require complex actions for their operation and control. Hence a comprehensive study of the entire system is necessary. The main aim of this paper is to analyze the basic operation of the North East-Agra MTDC scheme and suggest appropriate control measures for it. A simulation of the system is done in MATLAB-Simulink to understand how the system operates. Along with it, the details of the proposed controllers that can ensure proper control of each station of the HVDC link are also included. The results of the simulations show that the proposed controllers can be effectively incorporated in the system.