Research On Grid Connected Coordinated Control Of Wind Power And Solar Thermal Power Generation

China has a huge land area,complex geographical environment and abundant wind and solar resources.In recent years,China has vigorously developed wind and photovoltaic power generation industry.The large-scale integration of wind and solar energy can significantly reduce the power generation of thermal power units,which not only saves the cost of power generation,but also fits the new development concept of reducing pollution and improving environmental quality in China.However,due to the randomness and volatility of wind and solar power generation,its large-scale integration into the power grid will cause a certain impact on the power grid and damage its safe and stable operation,which undoubtedly limits the further development of wind and solar power.Photothermal power generation is a new way of solar energy utilization.The optical thermal power station has the ability to be comparable to the dispatching of thermal power units.To some extent,it can replace thermal power units for peak adjustment.If it can be reasonably dispatched,it can ensure the safety and economy of grid connection,and increase the permeability of new energy,which can play a certain role in promoting the development of new energy industry.In this paper,each component of the combined power generation system is disassembled and analyzed,and the operation mechanism of wind power,photovoltaic,photothermal and thermal power units is analyzed one by one.Among them,focus on the analysis of solar thermal power station,understand the energy conversion process and the operation characteristics of energy storage system,and then study the output characteristics and peak shaving characteristics of solar thermal power station,and compare it with thermal power units in peak shaving capacity and other aspects.Then,considering the output characteristics of photovoltaic,wind power and photothermal and their relationship with load,the theoretical models of all kinds of electric fields are established.Considering the constraints of power grid and all kinds of power supply operation,a multi-source joint dispatching system including wind power,photovoltaic,CSP and conventional thermal power units is established,and the double objective function optimization model is adopted to reduce the integrated operation cost of the joint system,reduce the peak valley difference of equivalent power load,and reduce the impact of the joint system on the power grid.Then,after in-depth study of the standard particle swarm optimization algorithm,we understand its performance and advantages and disadvantages,and combined with the concept of hybridization in genetic algorithm,we propose an improved HPSO algorithm.As an improved algorithm of basic particle swarm optimization,HPSO algorithm is a hybrid algorithm.This algorithm not only retains the advantages of basic PSO algorithm,which is easy to apply,easy to deal with the objective function and constraints,but also avoids its disadvantages to a certain extent,that is,it is easy to fall into the local optimum without jumping out.The improved HPSO algorithm is applied to solve the example model.The simulation results show that the addition of optical thermal power station can effectively improve the system’s wind and solar energy consumption level.If the minimum operation cost of the system is taken as the objective function,the minimum operation cost of the system can be obtained.If the double objective function is used for optimization,the economy can be guaranteed and the output can be stable.