Research On An Operational Optimization Of Multi Energy Complementary Micro Grid

With a background of the vigorous promotion of the regional energy internet,vigorous development of a green and low-carbon economy,and the increasing coupling of multiple energy flows,the multi energy complementary micro grid integrating a variety of distributed renewable energy,energy conversion devices and energy storage devices can realize the production,conversion,storage and distribution of energy,with high flexibility.As the nerve terminal of the energy Internet,it can improve energy efficiency,reduce environmental pollution and has good social and economic benefits.At present,the operation optimization of multi energy complementary micro grid is one of the core areas of multi energy complementary micro grid research,there are still many problems need to be solved urgently.On the one hand,how to achieve the optimal operation of the system under the conditions of safety,stability and environmental protection;on the other hand,how to reduce the influence of volatility and randomness of renewable energy generation on the system by using operation optimization strategy.Based on this,the main research contents are as follows:(1)The system structure of multi energy complementary micro grid is introduced,and the mathematical model of each unit is built.Briefly described the energy supply structure of multi energy complementary micro grid,and analyzed the two operation modes of grid-connected operation and island operation,the output characteristics and operating characteristics of fans,photovoltaic,heat pumps,CCHP and energy storage devices in the micro-energy grid were analyzed,and the corresponding mathematical model was established.(2)The operation optimization method of multi energy complementary micro grid with heat pump and phase change energy storage is studied.In order to alleviate energy shortage,improve energy utilization efficiency and enhance the flexibility of system adjustment,a system including photovoltaic,fans,air-ground source heat pumps,batteries and phase-change energy storage devices has been constructed,with the lowest operation cost as the objective function to established the operation optimization model of multi energy complementary micro grid.Considering the operation characteristics of energy storage devices and energy conversion units,the mixed integer linear programming method is used to solve the problem,the optimal output and total operation cost of each unit are obtained the economic effectiveness of the proposed model is verified.(3)The operation optimization method of multi energy complementary micro grid with CCHP is studied.Introduce the CCHP system,take a CCHP multi energy complementary micro grid including photovoltaic,fans,ground source heat pumps,CCHP and energy storage units as an example for analysis.With the lowest operating cost as the objective function to established the operation optimization model of CCHP type multi energy complementary micro grid,the mixed integer linear programming method is used to solve the problem,the optimal output and total operating cost of each unit are obtained,simulation results show the economic effectiveness of the model.(4)An operation optimization model of CCHP multi energy complementary micro grid considering tie line power fluctuation and demand response is proposed.Considering the dispatching value of terminal power load,the operation optimization model of CCHP multi energy complementary micro grid considering tie line power fluctuation and demand response is established,with the minimum tie line power fluctuation and operation cost,the mixed integer linear programming method is used to solve the problem,the optimal output of each unit and the comprehensive cost are obtained.The simulation results show that this method can effectively smooth the tie line power fluctuation curve,reduce the comprehensive cost,has remarkable comprehensive benefits.