Optimal Dispatch Model of Electricity-heat Integrated Energy System Considering Reserved Benefits of Heat Storage

In the provincial electricity-heat integrated energy system with combined heat and power (CHP) as the coupling point in northern China, the configuration of heat storage tanks (HST) in the CHP plants for power-heat decoupling is an effective way to release operation flexibility of the CHP units and improve the renewable energy accommodation capacity of the system. In order to give full play to the function of HST, this paper analyzes the mechanism of the transformation of the HST's heat supply reserve to the unit's generating reserve and establishes the corresponding model. For adapting to the day-to-day volatility and uncertainty of wind power, a heuristic day-time coordinated operation strategy is proposed, which indicates that the HST stores heat as much as possible in the period of no power curtailment of renewable energy generation and releases heat according to the demands during the period of power curtailment of renewable energy generation. Then, an economic dispatch model of the electricity-heat integrated energy system is established considering the reserve benefits of the HST under the proposed operation strategy. Case studies are carried out based on the actual grid data to verify the effectiveness of the proposed model and the benefits in saving fuel, accommodating renewable energy generation, and saving capacity. © 2021, Power System Technology Press. All right reserved.