Integrated Heat and Electricity Coordinated Dispatch Considering Multiple Time-Scale Flexibility of CHP Based on Thermal Energy Storage of DHS

Abstract

With the large-scale installation of combined heat and power (CHP) units and wind farms in China, the amount wind curtailment and system frequency stability problems have arisen. In this paper, from the perspective of coordinated operation of electric heating system, the multiple time-scale operation mode of CHP unit is studied, and the flexibility of CHP unit is released, thus alleviating the pressure of power system dispatching and operation control. Based on the analysis of thermal energy storage of district heating system (DHS), coordination model of heating network system and CHP unit are proposed, which effectively unlock the multi-time scale flexibility of the CHP unit (MTF-CHP). Based on the framework of the combined heat and power coordinated dispatch, an adjustable robust heat dispatch model in DHS and a power system scheduling model based on the allowable heat range of CHP (AHR-CHP) are proposed to realize the coordinated configuration of CHP unit scheduling flexibility and regulating flexibility in power system output and reserve.