Research On Optimizing Strategy Of Grid-connected Dispatching Of Transmission-end With Concentrated Solar Power

With the stable and rapid development of renewable energy source,the demand for renewable energy is gradually increasing.In China’s northwest and southwest regions,there are a lot of available land and abundant solar energy resources,which are suitable for the research and development of solar power technology.Although the research of photovoltaic(PV)started early and has a certain scale,due to the unstable and uncontrollable influence of solar energy resources,it cannot be used as a stable power source to be integrated into the grid,and it will also bring many safety problems to the operation of the grid,causing a waste of resources.Concentrated solar power(CSP)is another way to utilize solar energy to generate power.Although the researches on CSP were conducted late,researchers focus on the dispatchability and flexibility of CSP.However,there are still condition can be optimized in the installed capacity and construction cost of CSP stations,resulting in that cannot be connected to the grid.CSP and PV are complementary at the technical level.CSP stations can effectively alleviate the randomness of output of PV and increase the stability.The research on scheduling strategy of dispatching CSP and PV to achieve excellent economy and the better power output has certain engineering value and significance.Firstly,the composition and operating principles of CSP and PV were analyzed in this article and the mathematical models were established.At the same time,the accuracy of the models was verified through existing data.Secondly,two dispatch strategies of CSP and PV,full scheduling strategy(F-INT)and partial scheduling strategy(P-INT),are introduced.Based on constant power output and calculation of examples,it is concluded that the hybrid solar power of CSP-PV with F-INT had better performance than the P-INT.The hybrid power station has made certain improvements in power generation,LCOE and the output power of stability and continuity.Finally,considering various constraints of the hybrid solar power of CSP-PV with F-INT,the grid-connected dispatch model with the smallest violation of power generation and the smallest overall system operating cost was established.The improved butterfly optimization algorithm(m-BOA)was adopted to optimize the output of PV and CSP in each period.The optimal rated output power ratio of PV and CSP and the best heat storage capacity in the hybrid power station are obtained.Through the analysis of calculation examples,the optimized hybrid power station can satisfy the power generation demand of the power grid when the heat storage capacity is 9 hours,the power generation increased by 4.2%,and the comprehensive operating cost after the grid connection dropped by 10.4%.Through comparative analysis,it is can be concluded that the use of F-INT scheduling strategy for the hybrid power of CSP-PV can effectively alleviate the volatility and instability of PV output.At the same time,it can increase the power generation and the operating time of the hybrid power station.After optimization,the comprehensive operation cost of the hybrid power system effectively reduced after grid connection.With the heat storage system,the CSP station can fully exert advantages of flexible and dispatchable,reducing the impact of photovoltaic output by the intermittent and random of solar resources,improving photovoltaic power quantity and decreasing the amount of discarded light.The hybrid power of CSP-PV can partially replace traditional thermal power generation in the future,which can bring better economic and environmental benefits.