Decentralized Coordinated Dispatching Method Of Multi-area Interconnected Combined Heat And Power Systems Considering Exchanging Power Cost

The "Three North" areas have abundant wind power resources,but the abandoned wind rate has remained high for many years due to the constraints of "thermoelectric coupling".China’s load centers are mainly in the Yangtze River Delta and Pearl River Delta.China plans to build UHVDC for energy transmission,so as to realize long-distance and large-capacity wind power trans-regional accommodation.Therefore,how to select the interconnected areas of the wind power rich areas and how to select the tie-line electricity price in the power trading are the problems to be solved.Therefore,under the premise of considering the information confidentiality and dispatching independence of each area,this paper studies the decentralized coordinated dispatching method of multi-area interconnected CHP systems considering exchanging power cost.Firstly,the decentralized coordinated dispatching model of multi-area CHP systems considering the exchange power cost is established.In view of the limited capacity of wind power accommodation in the "Three North" areas and wind power coordinated accommodation between "Three North" areas and adjacent areas,and the development pattern of taking UHVDC as the main transmission channel between "Three North" areas and remote areas,the DC tie-line model is established.Based on the calculation principle of the analytical target cascading,under the premise of considering the information confidentiality and dispatching independence of each area,taking the tie-line power as the coordination variable,this paper establishes the decentralized coordinated dispatching model of multi-area CHP systems considering exchanging power cost.Then,the study on abandoned wind accommodation of multi-area interconnected CHP systems is carried out.The solution method of decentralized coordinated dispatching model is studied.The influence of the system characteristics of the area and the interconnected areas,and the abandoned wind accommodation measures taken in the interconnected areas on the abandoned wind rate of the area is analyzed by example simulation.The research shows that decentralized coordinated dispatching can reduce the abandoned wind rate of CHP system.Increasing the electric load,reducing the heat load,the proportion of CHP units and the wind power permeability can reduce the abandoned wind rate in the area.Wind power rich areas can reduce the abandoned wind rate by interconnecting with areas with high electric load,low heat load,low proportion of CHP units and low wind power permeability,and taking abandoned wind accommodation measures in the interconnected areas.Finally,the optimal tie-line electricity price is studied.The necessity of introducing tie-line exchange power cost into the decentralized coordinated dispatching model of multi-area interconnected CHP systems and the influence of tie-line electricity price on the abandoned wind accommodation are analyzed.Based on the calculation principle of the analytical target cascading,taking the tie-line power and the tie-line electricity price as the coordination variables,this paper establishes the tie-line electricity price optimization model of multi-area interconnected CHP systems.The research shows that the introduction of tie-line exchange power cost in the decentralized coordinated dispatching model is conducive to the abandoned wind accommodation.When the tie-line electricity price is between the comprehensive generation unit cost of the sending-end and the receiving-end,the abandoned wind rate is low,and when the tie-line electricity price is optimal,the abandoned wind rate of the sending-end system is lower.