An optimization model of under frequency load shedding in interconnected AC/DC power system considering emergency generation control

When a large disturbance resulting in large active power deficiency occurs, emergency automatic generation control (EAGC) and under frequency load shedding (UFLS) are the effective means to maintain frequency stability. In order to coordinate with UFLS, this paper considers the coordinated control of increasing the generators output and emergency power support of HVDC to enhance the system frequency stability in interconnected AC/DC power system. On this basis, an optimization model that concerns both frequency recovery performance and minimum amount of load shedding has been proposed, and the setting of action frequency and load shedding amount of UFLS scheme is designed. A corrected algorithm, named cloud adaptive particle swarm optimization with dimension mutation operator (CAPSO-DMO) is used for the above problem. The control and optimization algorithm is programmed in MATLAB. The simulation result verified the feasibility and effectiveness of the proposed model and method.