Optimal Dispatch of Microgrid Considering Frequency Stability Constraint

Microgrid (MG) plays important roles in the effective utilization of energies and the stable operation of the power grid. Existing studies of MG dispatch mainly focus on the economics dispatch by building optimal dispatch model. However, stability problems caused by load disturbances, especially frequency stability, will affect the dispatch results during the actual operation of MG. In this paper, an optimal dispatch model considering frequency security is proposed to obtain the dispatch results and ensure the frequency stability in the meanwhile. The frequency stability constraint is established by the limit of frequency deviation, which is derived from the system frequency response (SFR) model. Interior point algorithm is utilized to solve the optimization model in this paper. The effectiveness of proposed model incorporating frequency security constraint is validated with IEEE 5-node test system.