Combined Heat and Power Dispatch Based on Integrated Demand Response and Heat Transmission for Wind Power Accommodation

The fixed heat-power ratio has limited the flexibility of CHP(combined heat and power) units for wind power accommodation. Multi-energy end-users are the customers who possess electrical load and heat load. The complementation between the two kinds of load enables the end-users to participate in IDR(integrated demand response), which makes the CHP units more flexible. The heat transmission can also promote the flexibility of the CHP units, because it can decouple the real-time balance between the heat output of CHP units and the heat load. Hence, this paper integrates the IDR with the heat transmission and then proposes a combined heat and power dispatch to promote wind power accommodation in IEGM(integrated energy micro-grid). Firstly we formulate a simplified linear model of the complementation between different kinds of load in the end-user. Secondly the annular heat transmission network is formulated by the quasi-dynamics model of the pipeline temperature. Thirdly an IDR bi-level optimal dispatch model is proposed to gain a "win-win" situation between the IEGM operator and end-users. Finally the simulation results verify the positive impacts of the proposed dispatch on wind power accommodation and operational economy.