Regional Analysis Of Equipment Capacity Ratio Of Wind/PV Hybrid Generation System

In recent years,with the rapid development of economy,the problems of resources and environment are increasingly serious.China’s electricity consumption and fossil energy consumption are both increasing.As a result,renewable energy power generation occupies a more important position,and its power supply penetration increases year by year.However,wind power and photovoltaic power generation are greatly restricted by natural conditions,and which have the disadvantages of low energy density,unreliable and discontinuous power supply.But wind and solar power are complementary to each other in time and season.Wind/PV hybrid generation system is a system that makes use of the complementarity of the two power to generate electricity.It is also an effective way to deal with the strong volatility and unadjustability of wind-solar resources.The wind to solar ratio in the system is the primary factor affecting the power quality and economy.Based on this point,this paper explores the proportion of scenery under different resource conditions and different load demands.In this paper,the wind-solar complementary power generation system is taken as the research object.According to the topological structure of the system,the working principle and characteristics of the main components of the system are studied.The photovoltaic power generation and wind power generation system models are built in MATLAB/Simulink to simulate the output characteristics under different solar radiation intensity,temperature and wind speed conditions.Secondly,based on the evaluation indicators of wind energy and solar energy,the regional analysis of the distribution of wind and solar resources across the country is performed.At the same time,from the perspective of the demand for electrical loads,the demand characteristics of different types of load users are summarized.Then,according to different load demand characteristics,a capacity matching model with stable power output as the target and a capacity matching model with tracking load as the target are established.Among them,the capacity matching model aiming at the stable output of power fully considers the characteristics of wind speed and solar energy resources,adopts the chance constraint model in stochastic programming theory to establish the model,and uses the combination of stochastic simulation and particle swarm optimization algorithm to solve the model.While the capacity matching model with tracking load as the target takes full account of the time correlation among wind energy,solar energy and load,adopts the simulation model based on time sequence to carry out the capacity matching.Finally,the corresponding examples of the two models are analyzed.The first model is combined with the distribution characteristics of the national wind-solar resources to get the ratio result chart of the matching different regions’ system.The operation economy of the second model’s results are analyzed,and compared with those of the common matching model which takes the lowest life cycle cost as the objective function.It can be found that the operating cost is 13.23% lower than that of the common method.Therefore,it is concluded that when the output of the system is better matched with the load demand,the working pressure of the required energy storage elements is smaller and the operation cost is lower.The above research contents can provide certain reference value for the planning and design of Wind/PV hybrid generation system,the comprehensive energy adjustment among urban regions and the establishment of national energy Internet in the future.