Assessment research on accommodation capacity of renewable energy in distribution network

Abstract

On the basis of encouraging and promoting the development of distributed generation, the state has also issued relevant policies to regulate its integration. There is an urgent need to promote the construction of distributed renewable energy power stations on the premise of safe and stable operation of power grid. Guided by the consumption of renewable energy, guide the optimization of layout and orderly integration. The existing research results in the world are mainly divided into two categories: dynamic simulation method and mathematical optimization method. Neither of the above two methods has the actual computing power of the whole network distributed renewable energy accommodation capacity. The accommodation capacity of distributed renewable energy connected to the power grid is restricted not only by the security of distribution network, but also by the overall consumption capacity of renewable energy main network. If the renewable energy absorption capacity of the main network is not considered, the grid connection of distributed renewable energy beyond the penetration limit would inevitably lead to insufficient peak shaving capacity or transmission congestion of the main network, further aggravating the phenomenon of centralized renewable energy. In addition, the calculation of the renewable energy consumption capacity of the main network has not taken into account the power flow constraints of the transmission lines in the province and the safety boundary of the distribution network. Therefore, the calculation results of the consumption capacity on the accommodation capacity cannot be obtained by dimensionality reduction. Therefore, only by comprehensively considering the factors such as distribution network security constraints, main network absorption capacity and main network power flow constraints, can the accommodation capacity of distributed renewable energy be scientifically and reasonably evaluated.