Performance Analysis Of PV-CSP Hybrid Power Generation System

Solar energy is an abundant renewable energy source which has considerable potential for development.Two methods are used to convert solar energy into electricity:photovoltaic(PV)power generation and solar thermal power generation.At present,the cost of PV power generation is low,the system is simple and the layout is flexible,but the electric energy storage system is expensive and the life span is limited.Concentrated solar power(CSP)is stable,the efficiency is high,and the operation is reliable,but the cost of power generation is high.A fully integrated CSP-PV hybrid system can exhibit the advantages of the two systems to achieve a stable and manageable electricity output at a low cost.In this thesis,based on the commercial parabolic trough solar power system and PV system,comparative analysis was done to find a better integrated methods and the performance analysis was carried out.The operating characteristics of the system are analyzed in four operating modes,which are the single PV system,the single CSP system,and the partial coupling PV-CSP system and fully coupling PV-CSP system.For the fully coupled operation strategy,the PV system and the CSP system operate in collaboration to provide the required output power.The control system determines the amount of electricity generated by the PV system and the CSP system by optimizing the duration.The results shows that the fully integrated PV-CSP system has the lowest cost of generating electricity and the minimum amount of fuel needed.On the basis of a fully integrated PV-CSP power generation system,a control strategy for the complementary power generation system is proposed.In the PV-CSP system,PV subsystem and CSP subsystem operate deperately,the system coupled two subsystems through the energy distribution system or control system.PV power has priority and provided the energy required for auxiliary equipment of CSP system.Then the cost of power generation can be reduced.At the same time,a genetic algorithm was used to optimize the design of the PV-CSP hybrid system and to calculate the installed capacity and battery capacity of the PV system,as well as the storage capacity of the CSP system,thereby achieving the lowest electricity generation cost.PV power system and CSP power system are typical non-homologous isotropic systems.The cost of PV power system is low,the output of CSP power system is stable and the performance of energy storage is well.By coupling the PV power system with the CSP power system,they can undertake the basic load in the power grid and jointly solve the influence of the intermittent and volatility of solar energy on the reliability of the traditional power grid.The introduction of the CSP power system into PV power system makes the output power of the integrated system stable under the condition that the battery capacity is small.Integrated PV-CSP system makes full use of the advantages of the two power generation modes.The annual electricity generation of the system increases,and the number of hours used increases,which increases the energy utilization rate and reduces the occurrence of abandoning light.At the same time,it reduces the power cost of the solar power generation system.