Research On Transnational Network Transmission Line Planning In Xinjiang

In recent years,with the tightening of resources of traditional fossil energy and environmental pollution,the wind power generation has begun to develop rapidly.However,due to the uncontrollability of wind power,a high proportion of wind power grid connection reduces the stability of the system,resulting in a large "Abandoned wind",therefore,how to improve the capacity of new energy consumption and reduce abandoned wind is of great significance.As a major energy province in China,Xinjiang is rich in wind energy resources and has broad development prospects.However,the problem of “abandoning wind and limiting electricity” is very serious,which restricts the development of new energy.Therefore,in order to make up for the shortcomings of local absorption capacity of new energy and improve the level of new energy consumption,this paper studies cross-regional and transnational power grid transmission lines.First of all,this paper analyzes the principle of generating "abandoned wind" and the influencing factors,and proposes that power transmission is currently the most effective way to solve the problem of Xinjiang's new energy consumption.Then,with the goal of improving the capacity of new energy consumption,an optimization method of cross-region interconnected power grid that takes into account the energy transmission channel is proposed.Use wind power as a negative load and superimpose the load to obtain a generalized power load;use the gray slope correlation method to compare the similarity between the load curves and tap the source-space space-time matching characteristics of the interconnected area;finally,based on the power supply constraints,establish a regional assessment Mathematical model of capacity.Secondly,based on the above-mentioned methods of building outbound channels to improve the capacity of new energy consumption,taking into account the economics of transmission lines,this paper proposes a two-layer planning model for interconnection of multinational power grids: the upper layer model is built with the goal of minimum abandonment of wind volume as a way to achieve Optimized combination of alternative interconnected areas;using topology and capacity of interconnected channels as decision variables,based on optimal investment economic benefits,construct a lower-level mixed integer programming model to achieve optimal selection of interconnected transmission line landing points and parameters;upper-level alternative areas The combined result is used as the constraint condition of the lower layer planning,and at the same time,the lower layer feeds the result back to the upper layer for economic verification.Thirdly,this paper uses two genetic algorithms to solve the above model: first generate the upper-level initial population,use genetic algorithm to solve the optimal decision,and then substitute the feasible upper-level decision into the lower-level programming model to solve,and at the same time,the optimal of the lower-level model The solution is fed back to the upper layer to solve the upper fitness value,to determine whether the upper optimal solution is within the feasible region,and so on,and finally the global optimal solution is obtained.Finally,based on the typical wind power output and load data,this example is programmed to solve the model.The planning results show that: a new transmission line has been built,which has reduced Xinjiang's wind curtailment to 3128 MWh,achieved an annual income of 677.2 billion yuan,and improved New energy consumption capacity and the plan can meet the power demand of the load area until 2030.Finally,through theoretical analysis and sensitivity analysis,it is verified that the division of the balance area,the reserve ratio,the minimum technical output coefficient of the conventional unit and other factors will have an impact on the new energy consumption capacity.The research work in this paper can improve the economic benefits of the power grid,have a guiding significance for the consumption of new energy,and provide an effective basis for energy development planning.