Abstract
The electricity-heat integrated system can realize the cascade utilization of energy and the coordination and complementarity between multiple energy sources. In this paper, considering the thermal comfort of users, taking into account the difference in dynamic characteristics of electric and heating networks and the response of users’ demands, a dispatch model is constructed. In this model, taking into account the difference in the time scale of electric and thermal dispatching, optimization of the system can be improved by properly extending the thermal balance cycle of the combined heat and power (CHP) unit. Based on the time-of-use electricity prices and heat prices to obtain the optimal energy purchase cost, a user demand response strategy is adopted. Therefore, a minimum economic cost on the energy supply side and a minimum energy purchase cost on the demand side are considered as a bilevel optimization strategy for the operation of the system. Finally, using an IEEE 30 nodes power network and a 31 nodes heating network to form an electricity-heat integrated system, the simulation results show that the optimal thermal balance cycle can maximize the economic benefits on the premise of meeting the users’ thermal comfort and the demand response can effectively realize the wind curtailment and improve the system economy.
Highlights
In energy demand, heat and electric energy are the basic needs of human production and life, and the main energy forms of the integrated energy system
Tout = (Tr − Ta )ehls /cm + Ta where h is the heat transfer coefficient; ls is the length of the pipe; m0 is the superior hot water mass flow connected to the user; Ts, Tr and Ta refer to the water supply temperature, return water temperature and outdoor temperature of the heat pipe in the heating network, respectively
Controlling the user’s equipment and the radiator water valve according to the current electricity and the heat prices to meet improving the economy of the electricity-heat integrated system
Summary
Heat and electric energy are the basic needs of human production and life, and the main energy forms of the integrated energy system. A specific heat pump model is proposed and open data from building, climate, and economic sources are used for analysis This kind of electric heating equipment can effectively reduce carbon emissions. Based on the time-of-use electricity price, a new energy optimal dispatching model considering the users’ comfort and power consumption economy of microgrid was proposed in [15]. Exploiting the available potential of user-side resources, a time-scale economic dispatch model of electricity-heat integrated systems considering thermal comfort is established. The simulation results show that the optimization model can determine the optimal heat regulation time of the system, which meets the requirements of user comfort, improve the flexibility of the system, improve the system operation economy, and effectively improve the wind power absorption capacity
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