| As an effective approach to improve the utilization efficiency of renewable energy,the Multi-energy complementary microgrid(MEMG),which consists of power source,heat source,energy storage system and load,has attracted more and more attention in ensuring secure and sustainable energy supply.Memgs,which operate efficiently and flexibly in grid-connected or grid-isolated mode,are playing an increasingly important role in the consumption of renewable energy,complemented by demand response strategies and taking advantage of load flexibility.With the proposal of the national policy of "carbon neutrality and carbon peak",carbon emission has become an important index of the system operation,and how to realize the MEMG system low-carbon economic operation has become a key technical issue.In this thesis,optimization scheduling issues such as coordinating MEMG demand response strategies and low-carbon characteristics are studied.The main contents are as follows:Structure and energy flow mechanism analysis of MEMG.The research includes the working principles of scenery,electric energy storage,heat storage tank and heat load,etc.The MEMG model is built based on the operating characteristics of the equipment.The model can realize the flexible conversion between electricity and heat,which lays a foundation for the subsequent guidance of MEMG planning and operation research.Secondly,in order to coordinate the interest relationship between MEMG and the demand for Comprehensive load(CLD)of the lower layer,based on the MEMG model,a MEMG-CLD two-layer economic scheduling model considering the dynamic pricing mechanism of the upper and lower layers is constructed.A new dynamic pricing mechanism was proposed,and an Integrated demand response(IDR)scheme was designed that considered the satisfaction of electrical load and the flexibility and comfort of thermal load,so as to effectively coordinate the interest relationship between the upper and lower levels of MEMG-CLD,and further explore the potential interaction ability of the upper and lower levels of source-load.CPLEX was used to solve the MEMG-CLD double-layer model iteratively,and the effectiveness of the proposed model and scheme was verified in the improved electro-thermal microgrid system.Finally,under the dynamic pricing mechanism,a low-carbon economic dispatching model of microgrid is proposed,which considers the characteristics of comprehensive load demand response and the stepped carbon trading mechanism.The Integrated demand response(IDR)model of electric heating load was constructed to analyze the influence of IDR on low-carbon economic operation of microgrid.A stepwise carbon trading mechanism was introduced into the optimal scheduling model,and a low-carbon characteristic model of micro-grid was built to realize the low-carbon operation of MEMG economy.CPLEX was used to solve the low-carbon economy optimization model of micro-grid,and the effectiveness of the proposed model and algorithm was verified in the improved test system of micro-grid. |
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