Coordinated Dispatch of Integrated Electric and District Heating Systems Using Heterogeneous Decomposition

Extensive deployment of combined heat and power (CHP) units into the electric power system (EPS) makes it imperative to investigate the utilization of flexible resources in a district heating system (DHS) and avoid unnecessary wind power curtailment. In this paper, a combined heat and power dispatch (CHPD) model is developed by considering the flexibility of heat sources, pipelines, and DHS loads. Specifically, the adjustable region of the CHP units, heat storage of the heating networks and thermal inertia of the buildings are taken into account. Moreover, the heterogeneity of the EPS and DHS requires the independent control over the two systems. We propose a novel decentralized algorithm for solving the CHPD problem based on the heterogeneous decomposition method. The algorithm only requires the locational marginal prices at boundary buses of the EPS and the injected boundary power of the DHS to be exchanged. Numerical simulations are carried out for real data in Jilin. The flexible resources are optimally utilized and the wind power curtailment is reduced in the CHPD, with the alleviation of congestion in the EPS. Besides, simulations demonstrate that the proposed algorithm is efficient and robust, with a light communication burden to solve CHPD.