Power Planning Based On Flexibility Index

The energy structure of my country’s "Three Norths" region has obvious characteristics,mainly composed of coal-fired power generation units.The adjustment range and speed of coal-fired power generation units are subject to certain restrictions.The "Three Norths" area is rich in renewable energy such as wind and solar energy,including large-scale wind and solar power generation bases planned and constructed by many countries.With the gradual increase of wind power and solar grid-connected power generation,traditional coal-fired power generation units cannot quickly stabilize wind and solar power generation and load fluctuations.Coupled with the insufficient delivery capacity,a large amount of abandonment of wind and photovoltaic energy is generated every year,causing serious waste of resources and potential loss of economic benefits.The fundamental reason is the insufficient flexibility of the local power system.In order to improve the utilization efficiency of renewable energy in the Three-North region,this paper focuses on the flexibility of the power supply side and the load side from the perspective of improving system flexibility,and conducts a research on power supply planning based on flexibility indicators.First of all,this article introduces the meaning of flexibility and the manifestation of flexibility characteristics.On this basis,it introduces the classification and evaluation methods of resource flexibility.It is pointed out that the establishment of flexibility indicators will have different choices based on different focuses.The determination and planning of text flexibility resource sets provide certain basic concepts.Secondly,this paper takes a certain area in the northeast as the main research object.In the process of determining the flexible resource set,the characteristics of the regional power supply structure are considered,and the necessary flexible resources are determined to alleviate the phenomenon of local abandonment of wind and solar.On this basis,the feasibility of using straw as an auxiliary flexible resource to enter the flexible resource set was verified.With the goal of economy,comparative analysis of the pros and cons of wind and solar energy consumption,and the best flexible resource set combination method was obtained.Finally,the impact of the capacity changes of the two flexible resources on the system’s wind energy,solar energy consumption and economy is analyzed.The phantom outcome illustrates that the flexible resource selection plan put forward in this dissertation can absorb more wind and solar energy resources under the economic premise.Finally,on the basis of the above research,the size of the flexibility index in the planning process was quantified,and it was incorporated into the planning model as an optimized decision variable,and a two-level expansion planning model with investment economy and operating economy as the goal was established.With operation simulation and flexible quantitative evaluation as the main body,particle swarm optimization algorithm is used to solve and complete the initial expansion planning plan,and then determine the optimal result of the planning work.The simulation results show that the two power supply planning schemes can effectively improve the flexibility of the power system,thereby absorbing more wind and solar resources,and can obtain better economic benefits,and realize the green,low-carbon,safe and economic operation of the power system.However,compared with considering the flexibility of the supply and demand side at the same time,only focusing on the flexibility of the demand side,the obtained electric energy has certain advantages in investment economy.However,due to more wind and solar abandonment,the operation economy is lower than that of the former.