Research On Distribution Network Planning And Technology Adaptability Evaluation Geared To The Bilateral Randomness Problem Of Power System

In recent years,with the rapid development of society and economy,the pressure of fossil energy depletion and environmental deterioration is increasing.Therefore,the development of renewable energy has become the inevitable choice for the future development of China’s energy industry and the promotion of energy revolution.However,as the representative of the renewable energy,the output of wind power and PV generation has the characteristics of intermittent and volatility,which will make the power system from the traditional supply side and demand side controlled stochastic volatility systems into a bilateral synchronous random fluctuation of supply and demand.This will transform the power system from a traditional one,which the supply side is controllable and the demand side is randomly fuluctuaing into a system with simultaneous fluctuation of both demand and supply sides.It brings a series of new problems to the planning and operation of the system,namely the bilateral randomness problem of the power system.Bilateral randomness problems can affect the transmission network and distribution network to varying degrees.Compared to the transmission network,the construction and development of distribution network in China is relatively weak.Besides,distribution network also bear the important task of accepting the distribution generations and meeting the demand of terminal users.Therefore,the bilateral randomness problem has more significant impact on the distribution network.Under this circumstances,the research on distribution network planning and technology adaptability evaluation geared to the bilateral randomness problem is of great significance to stabilize the bilateral randomness of power system and promote the coordinated development of distributed generation and distribution network.In this paper,the distribution network planning and its technical adaptability evaluation under the background of bilateral randomness problems are systematically studied.Firstly,the cause of the bilateral stochastic problems in the power system and its influence on the distribution network planning are studied,and the development ideas of the distribution network under the background of bilateral random problems are proposed.Secondly,based on the theory of bilevel optimization and robust optimization,while the introduction of the demand response and energy storage,the construction of distribution network planning model for bilateral stochastic problems,a distribution network planning model geared to bilateral randomness problem is built.The proposed modes is solved by an improved particle swarm optimization with nested structure.The proposed model not only has significant economic benefits,but also has good robustness,which can avoid inefficient and ineffective problems in uncertain environment.Thirdly,in order to evaluate the adaptability of the plan when failures occur in the system,a pseudo-sequential Monte Carlo method for distribution network state simulation is proposed.This method can realize the complementary advantages of the traditional pseudo sequential Monte Carlo method and sequential Monte Carlo method.Fourthly,the adaptability evaluation strategy of distribution network technology for bilateral randomness problem is established.Based on the"transcendental" logic,through the introduction of the grid simulation used in reliability evaluation of power system,the proposed method is able to break the limitation of data and evaluation object in the traditional comprehensive evaluation.At the same time,an index system and the corresponding weighing&evaluation method to the evaluate the technology adaptability of distribution network for bilateral randomness problem are put forward.Thus,the adaptability of the distribution network to the bilateral randomness problems is evaluated scientifically.