Unit Commitment with Integrated Energy System Considering Primary and Secondary Frequency Regulation

With the development of renewable energy generation (REG) such as wind power, the economic operation of power system is greatly challenged by the phenomenon of wind curtailment. To reduce the operation cost of power system and improve the accommodation capacity of renewable energy, a unit commitment (UC) model with integrated energy system (IES) considering primary frequency regulation (PFR) and secondary frequency regulation (SFR) is proposed in this paper. Firstly, establishing the model to co-optimize the electric system, gas system and thermal system. Then, for the nonlinear problem of natural gas pipeline flow, an incremental piece-wise method is proposed for linearization, from which the nonlinear non-convex programming problem can be transformed into a mixed integer linear programming (MILP) problem. Finally, 24-bus electric system, 20-bus natural gas system and 16-bus thermal system are used to simulate and verify the proposed model in this paper. Numerical results illustrate that the unit commitment considering integrated energy system is beneficial to improve the energy efficiency and the economy of the system operation.