Research On Multi-source Joint Grid-connected Scheduling Strategy With CSP Based On Cost Optimization

China has a vast territory and abundant wind and light energy resources.Wind power and solar photovoltaic power are developing rapidly.With the increasing grid-connected scale of wind power and solar photovoltaic power,it can effectively reduce the power generation of thermal power units.However,due to the randomness and uncertainty of new energy generation represented by wind power and solar photovoltaic power,the large-scale grid-connected of new energy generation will seriously affect the safety and economy of the grid,thus limiting the further development of wind power and photovoltaic.Concentrating solar power(CSP)is an emerging form of solar power generation.The schedulability of CSP is on a par with the thermal power units.Hence,it can replace the thermal power units to cope with various power generation forms to some extent.The new energy penetration rate of the power system can be increased by properly scheduling CSP.Meanwhile,the economy and safety of power systems which contained wind power and solar photovoltaic power will also be improved.In fact,multi-source combined grid-connected operation of wind power,photovoltaic power,CSP and thermal power units has been realized in some areas with abundant wind and light energy resources in China.Therefore,how to coordinate the dispatch of each power supply and achieve the best economic performance on the basis of ensuring safety is a very worthy of study.Firstly,on the basis of analyzing the operation characteristics of wind power and photovoltaic and CSP,this paper familiarizes with the running process of CSP plants.After that,this paper researches the conversion process of sunlight–thermal-electricity and the working principle of CSP,and analyzes how the components and their own characteristics influence the CSP plants operation.Then,in consideration of operation constraints in traditional power system and CSP plants' constraints at both electric power dispatch and thermal dispatch levels,a joint scheduling model of CSP plants and thermal power unit is established to minimize the costs.Meanwhile,genetic algorithm is introduced to resolve the model,and such factors as thermal power unit cost,the benefit from environment of CSP,operation and maintenance cost,the cost of spinning reserve and operating security constraints of power grid are synthetically considered to make the optimal scheduling strategy.The results of calculation examples show that CSP plants have strong ability of schedulability,a negative influence will be added to the stability and economy of power grid operation by not scheduling the output of CSP plants,while utilizing the schedulability reasonably can decrease the electric energy production of thermal power unit and improve the economy of the parallel operation.Finally,to fit for the energy developing trend of multi-source coexistence combined grid connection,considering comprehensive cost as the precondition,and taking into operating security constraints of power grid,the integrated scheduling strategy of wind power-photovoltaic power-CSP considering comprehensive cost is presented.Such factors as generation cost of fossil power generation units,the benefit and operation and maintenance cost from environment of wind power,photovoltaic power and CSP,the cost of spinning reserve and purchasing peaking load regulation capacity,and operating security constraints of power grid are synthetically considered.Results show that CSP plants can smooth regulated output by adjusting and controlling the thermal storage system,as well as have the great schedulability.Meanwhile,on the premise of guaranteeing safe running,optimal operation economy can be obtained by reasonable dispatching of the output of CSP plants.