Research on heat and electricity coordinated dispatch model for better integration of wind power based on electric boiler with thermal storage

摘要

The thermal-electric coupling characteristics of combined heat and power (CHP) units make it critical problem to improve wind power accommodation ability in the heating season. This study establishes a CHP dispatch model for better integration of wind power based on electric boiler with thermal storage (EBTS). A start-stop strategy of EBTS is formulated that takes only the abandoned wind as the heat source. The electric boiler runs at maximum power during the wind curtailment, and the heat output of EBTS is changed by controlling the endothermic and exothermic rates of the thermal storage. Considering the scheduling difficulty of the CHP system with EBTS, the multi-agent model of heat and electricity is built. Through information exchange and load distribution between the agents, electric load is balanced by all units while thermal load by CHP units and EBTS. Finally, the Newton-Raphson iterative method is applied to solve the proposed model. The results of numerical examples validate effectiveness and economic improvement of the proposed method.