| The inexhaustible exploitation of resources promotes the rapid development of the global economy,but the resulting resource consumption problems make the sustainable development of the economy facing a dilemma.Therefore,the exploitation of the utilization potential of renewable energy has become an effective means to relieve the energy shortage.In China,the wind energy resources are abundant,but the concentration degree is high,far from the load center.This characteristic of inverse distribution between resources and load demand makes it difficult for large-scale wind power to be fully utilized in China.With the promulgation of the wind power quota system and the depth of the pluripotent complementary system coupling,using the inter-district HVDC(high-voltage direct current)and regional energy conversion between different networks can effectively promote wind power inter-district and on-site given two ways of joint operation has expand the scope of supply,enhance system reliability and improve the efficiency of the wind power given proportion,and other.For this reason,this paper proposes a multi-agent network interconnection economic dispatching model which synchronously realizes cross-regional and local consumption of wind power.In order to realize the cross-regional consumption of wind power,the traditional power network with DC interconnection is taken as the research object,and the power network model and the DC(direct current)tie line model which take into account the demand response and reactive power compensation optimization are established.Firstly,according to the different demand response mechanisms,incentive based demand response model and price based demand response model are established respectively to fully realize the interaction between source and charge.Secondly,in view of the voltage fluctuation caused by wind power access,reactive power compensation optimization is carried out at important load nodes.Finally,according to its stepwise operation mode,the equivalent generation unit model is established to realize the free optimization of the transmitted power within the specified fluctuation range and fully explore the flexible adjustment space of the DC tie line.In order to realize the local consumption of wind power,an electric-air coupling network model based on gas unit and P2G equipment is established.Firstly,drawing on the characteristics of the traditional power network,the pipeline model,pipe storage model,gas storage tank model and compressor model in the natural gas steady state model are established to accurately express the dynamic operation characteristics of the natural gas network.Secondly,the energy conversion mechanism between the power grid and the natural gas network is studied.By setting multiple global variables,the coupling model of gas unit and P2G equipment is established to realize the two-way energy conversion.Based on the difference characteristics of different resources in time,a joint dispatching model of cross-region DC interconnection system based on power-gas coupling is established to realize cross-region and local consumption of wind power synchronously.In order to ensure the privacy of information transmitted between networks,a number of global variables were set,and the upper main problem of system joint scheduling was decomposed into several sub-region optimization problems,which were solved by using the alternating direction multiplier method.Finally,the effectiveness of the proposed method and model is verified in an improved IEEE-RTS79 test system and a 20-node Belgian gas network.In addition,the joint dispatching of DC interconnection system based on power-gas coupling greatly reduces the operating cost of the power system.Based on the cooperative game,the Shapley value distribution method is adopted to distribute the economic benefits of system joint operation to ensure the fairness of distribution. |
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