Analysis of Controlled Islanding Strategy Considering Renewable Energy and HVDC

Determining the optimal islanding solution is an essential issue of controlled islanding. However, the problem is commonly simplified as a single-objective optimization problem in existing literature, which is not able to ensure the stable operation of sub-systems after separation due to the development of renewable energy and high voltage direct current (HVDC) transmission. Therefore, this paper presents an unproved islanding strategy considering renewable energy and HVDC. In the first step, initial splitting surface is obtained based on traditional single -optimization model, which may not be the optimal solution lbr the current complex system, and then similar feasible solutions are selected. In the second step, multi-infeed short circuit ratio (MSCR) or renewable energy penetration of sub-systems created by feasible solutions in the candidate space are verified to determine the final islanding solution. Simulation results in 39 -bus test system indicate that the strategy is effective to improve frequency and voltage stability of sub-systems.