Research On The Evolution Path Of Microgrid Based On Symbiosis And Synergy Theory

The multiple pressures of energy supply security,regional environmental degradation,and global greenhouse effect force people to continuously explore the development and utilization of renewable power.The development of microgrid is an important way to improve the efficiency of renewable power.At present,how to promote the pilot demonstration projects on scale and marketization is an urgent problem for the development of microgrid.In view of this,based on the theory of ecology and symbiosis coordination theory,this dissertation constructs the power supply symbiosis system integrating microgrid and studies the relationship and evolution trend among the symbiosis units.On this basis,this dissertation studies and analyzes the key symbiosis parameters of the microgrid,and then studies the evolution path of microgrid.Finally,this dissertation verifies the proposed microgrid evolution path through real cases and puts forward countermeasures and suggestions to promote the development of microgrid.The main research works of this dissertation are as follows:(1)This dissertation expands the symbiotic state,puts forward the concept of"global symbiosis",and deepens the connotation of symbiosis.Based on the summary and analysis of the existing symbiosis theory,aiming at the symbiosis of mutual harm existing between populations,this dissertation adds the behavior mode of "reverse"symbiosis,puts forward the concept of "global symbiosis",expands the research scope of symbiosis theory,and deepens the connotation of symbiosis.Additionally,according to the concept of "global symbiosis",this dissertation extends the classical four symbiotic behavior modes to eight.Finally,based on the symbiotic principle,the equilibrium point and stable state between symbiotic units are solved and analyzed.(2)On the basis of the current symbiotic system model consisting of a limited number of symbiotic units without external incentives,this dissertation extends the scope of symbiotic units to n-dimensional space and adds external incentive variables to build a multi-systems symbiotic and synergic evolution model.Based on the analysis of the evolution conditions,stable equilibrium points,and stable characteristics of the dual symbiotic units,this dissertation constructs a symbiotic system evolution model with external incentives and deduces the co-evolution process of multi-systems with external incentives,which provides theoretical support for the research of synergic evolution process of the microgrid.(3)According to the adaptive symbiosis theory,this dissertation establishes a synergic evolution model with a symbiotic system composed of microgrid with external incentives,a large grid,and users,and deeply analyzes the influencing factors,evolution conditions,and evolution process of the synergic evolution system.Then,based on the characteristics of power system operations,this dissertation constructs a symbiosis system including microgrid symbiosis unit,large grid symbiosis unit,and user symbiosis unit,and analyzes the symbiosis structure,symbiosis mode,and symbiosis environment of the symbiosis system by using the global symbiosis theory.Besides,aiming at the value extension object and strong-linkage object of microgrid,this dissertation establishes the symbiotic and synergic evolution model integrating microgrid,analyzes the synergic relationship of symbiotic units,and defines the growth space of microgrid.Finally,according to the analysis principle of the equilibrium point in the differential equations,this dissertation discusses the symbiotic stability and synergic evolution direction of the symbiotic system and provides simulation analysis.(4)By analyzing the evolution logics of microgrid under the synergy of symbiosis system,this dissertation constructs the evolution path model of microgrid with key symbiosis parameters and extracts the evolution path of microgrid through simulation or experiment.Firstly,based on the synergic evolution theory of the intergrowth system integrating microgrid,this dissertation determines the key intergrowth parameters like power,spatial load density,and market price from the perspective of the supply side,demand side,and supply-demand pair relationship.Then,the intergrowth parameters are incorporated into the modeling of the microgrid subsystem,and the synergy process based on the intergrowth parameters is deduced,and the evolution path of the microgrid is analyzed and extracted by simulation or experiment.Finally,according to the life cycle theory,the development of microgrid is divided into five stages,and the evolution path of the microgrid is constructed under the joint effect of multiple symbiotic parameters.(5)Based on the empirical study.this dissertation puts forward some suggestions for the evolution of microgrid,which are suitable for China's power market environment.Based on the empirical analysis of the evolution conditions,process and results of global microgrid,it is concluded that the current economic principlcs and robustness of the operations of large grid directly affect the synergic behavior of symbiotic system composed of microgrid,large grid,and users,which forms different microgrid evolution paths.Additionally,combined with the evolution path analysis of typical cases about independent microgrids and grid-connected microgrids at home and abroad,this dissertation puts forward the microgrid evolution path suitable for China's national conditions from the perspective of symbiosis and coordination theory and provides countermeasures and suggestions to promote the development of microgrid at the macro,meso,and micro levels.