Study on Emergency Control of Reactive Power after HVDC Blocking Fault with Large-scale Renewable Energy

It may cause steady-state voltage problem after the HVDC blocking failure and cutting off large number of supporting photovoltaic power supply, which will exceed the voltage limit and seriously threatens the safety of power grid equipment. Firstly, aiming at the lack of reactive power emergency control after HVDC blocking fault, the reactive power emergency control method based on fault event and voltage response was proposed in this paper. Which provides a guaranteed approach to solve the system steady-state overvoltage problem after the accident. Secondly, the priority of reactive power control sites and the quantity of control measures were determined based on sensitivity technology. And the action logic and overall architecture of the control system was designed. Finally, the proposed control method and strategy were verified by the simulation results of the northwest China power grid. The research conclusions can provide theoretical references for the design of the scheme and control strategies for the renewable energy integrated HVDC delivery system.