Research On Optimized Dispatching Of Distributed Energy Clusters Considering Demand Response

The increasing proportion of distributed generation in distribution network is the main trend of power system development.However,the fluctuation of the output of renewable energy such as wind power and photovoltaic will affect the security and stability of the system,causing problems of local accommodation,power backward transmission,increased network loss,voltage over-limit,etc.,which is not conducive to the expansion of distributed power sources.In view of the problems caused by the high proportion of distributed energy connected to the distribution network,we can study from the power supply side and the demand side.On the power supply side,we can choose the scheduling mode suitable for the high proportion of distributed energy connected to the grid and use energy storage to participate in the accommodation of distributed energy.On the demand side,demand response is applied to give full play to the adjustment ability of demand-side resources.It is of great significance to study the optimal scheduling strategy of distributed power cluster considering demand response and energy storage regulation,which is of great significance to improve the accommodation rate of distributed power and ensure the safe and economic operation of distribution network.Firstly,the source accommodation demand of high proportion distributed energy in distribution network is studied.Taking the actual data as an example,the output characteristics of distributed photovoltaic are analyzed.Based on the actual 46-node distribution network system,the influence of high proportion of distributed power access on the voltage and network loss of distribution network is studied,and the accommodation demand of high proportion of distributed energy access to distribution network is summarized.On the power supply side,the optimal scheduling strategy of distributed photovoltaic cluster considering the accommodation of new energy is studied.Taking the modularity index and active power balance index based on electrical distance as cluster division indexes,the genetic algorithm is used to divide the distributed power supply clusters.On this basis,an optimal dispatching model of distributed power supply clusters considering the accommodation of new energy and the regulation of energy storage is established,and the proposed model is verified by an example simulation.The results show that the energy storage and cluster-based dispatching methods are effective in promoting photovoltaic local accommodation and ensuring the safe,stable and economic operation of distribution network.Then,from the power supply side and demand side,the optimal scheduling strategy of cluster output considering demand response is studied.The load characteristics of electric vehicles and temperature-controlled loads are studied from the perspectives of users’ demand and load characteristics.On this basis,an optimal dispatching model of distributed power supply cluster considering demand response is established.The effectiveness of the proposed model is verified by an example simulation.The results show that the implementation of demand response can further improve the local accommodation level of distributed energy,reduce the operating cost of distribution network,and ensure the safety,reliability and economy of distribution network operation.