In recent years, the combined cooling, heating and power (CCHP) system has attracted increasing attention. However, due to data privacy, it is challenging to exchange detailed topology or operation states between electric power system (EPS) and district heating and cooling (DHC) system, so it is necessary to carry out distributed optimization for the CCHP system dispatch problem. This paper is focused on CCHP system dispatch problem and first establishes its mathematical model. Then, based on the relaxed alternating direction method of multipliers (R-ADMM) algorithm, this paper proposes the adaptive step-size R-ADMM algorithm using the strategy of adaptive step-size to reduce iteration times. Simulation results show that the adaptive step-size R-ADMM algorithm can significantly reduce the number of iteration times compared with the classic alternating direction method of multipliers (ADMM).

combined cooling, heating and power system;alternating direction method of multipliers;adaptive step-size;distributed optimization