Feasibility Analysis And Scheme Evaluation And Optimization Of New Energy Participating In Black Start

With the increasing scale of power grid,people’s demand for electric power is getting higher and higher.Once a blackout happens,it will cause immeasurable losses to social economy.Therefore,it is very necessary to restore power supply to the system as soon as possible after the blackout.Studying the black start of power system and formulating a complete black start scheme in advance can realize the rapid recovery of the system after the blackout,which is of great significance to reduce the economic and social losses caused by the blackout.With the gradual advancement of new power system construction,the scale of new energy access to the power grid is also increasing.With the strong support of national policies for new energy,the increasing proportion of new energy has become a trend in the future.Pumped-storage units are mostly used in traditional black-start power supply,but there are fewer pumped-storage units and more new energy units in northwest China with less water,Therefore,it is necessary to study the black-start process of new energy as the starting power to speed up the system recovery.This paper studies it from the following aspects.Firstly,this paper introduces the mathematical model and characteristics of the wind-solar storage system in detail,and builds a black-start simulation model of the auxiliary engine of thermal power unit with wind-solar storage by using PSCAD.The feasibility of black-start with wind-solar storage is verified by simulation.Then,in view of the fact that the new energy black-start power supply is weaker than the traditional black-start power supply in the early stage of black-start,The effects of different wind speed,light intensity,auxiliary equipment capacity and voltage level of auxiliary equipment on the early black start are verified by simulation.Finally,a method to improve the confidence of new energy black start is proposed and verified by simulation.On this basis,a method for selecting and evaluating black start power supply is proposed,and the effectiveness of this method is verified by IEEE39 bus system.