Research On Reliability Of Composite Generation And Transmission Systems With Hybrid Pv-csp Plants

With the continuous industrialization of the world,air pollution and energy shortage are posing threat to the development of global human beings,especially the prominent contradiction between the huge demand and the limited energy supply.The clean and sustainable renewable energy source has become a hot topic to be researched for scholars from all over the world.Solar energy is clean energy that can be used on a large scale and durable.Compared with photovoltaic(PV),concentrated solar power(CSP)generation generally uses a steam turbine generator,which can significantly smooth the power output and convert the solar energy into thermal energy storage.It has been proved that can be used to generate electricity after nightfall or when peak load and frequency regulation.Therefore,CSP can improve the synchronous support capacity of the power grid,which is suitable for the weak areas of the power grid with sufficient solar energy.However,as a new power generation method,its generation reliability model and the impact on the reliability of the previous grid still need to be further evaluated.Therefore,this thesis studies the reliability of the power system with hybrid PV-CSP plant,and the remainder of the paper is organized as follows:In this paper,the generation reliability model of PV and CSP is carried out firstly.Given that the failure of internal components and the availability of external plants,a two-layer Markov model of CSP is established;and the fluctuation of PV output power is also taken into consideration.State duration sampling and credible capacity are evaluated for the proposed model.The results further verify that the access of CSP contributes more to the system reliability than that of PV of the same capacity.Secondly,in order to solve the problem of optimal configuration of hybrid PV-CSP plant,a multi-objective model of configuration-dispatch planning is established,which not only the power supply characteristic is considered,but also the load characteristic is considered.The model is solved by using fuzzy set(FS)and rough set theory(RS),and the optimal ratio of PVCSP capacity optimization is obtained through the comparison of various schemes,which provides advice for the configuration of multi-energy complement power stations.Finally,to study the multi-periodicity of reliability assessment,the model of short-term reliability of the power system is discussed.Meantime,a proper index system is developed for long-term and short-term reliability assessment,which is able to comprehensively reflect the system reliability characteristics and operational risks at qualitative and quantitative levels.A two-layer evaluation model of composite generation and transmission systems considering PVCSP is proposed.The upper layer regards 8760 hours as the time scale,while the lower one is1 hour,in order to reduce the operational risk of the power system based on real-time conditions.The simulation results show that the proposed control model can effectively correct the loadshedding of the upper layer.