Study On Remote Integrated Energy Systems Based On Concentrating Solar Power Plant

With the economic development and the improvement of the quality of life,the energy demands in remote areas have gradually increased.However,energy systems in some remote areas need to be upgraded because the fuel of conventional power plants is difficult to reinforce and expensive.In addition,stricter emission standards have limited the application of conventional power plants with small installed capacity in remote areas.Concentrating solar power(CSP)with thermal energy storage(TES)has high schedulability,which can make full use of solar energy and realize self-production and consumption of electricity in remote areas.In this way,the quality of life of residents can be further improved and the local ecological environment can be protected.Although renewable energy generation systems based on CSP plants can be the main source of electricity in remote areas,a single CSP plant is costly and cannot meet the abundant demands for heating or cooling.Therefore,energy systems need to be designed according to local conditions.At the same time,more power generation facilities and energy storage facilities should be added to reduce the overall cost and enhance the utilization of energy systems.In this thesis,considering energy demands of different remote areas,two kinds of integrated energy systems based on CSP plants are designed.Furthermore,the configuration and scheduling for the energy systems are proposed respectively.Firstly,this thesis divides remote areas into the following two categories: one is remote areas with only electricity demand;the other one is remote areas with multiple energy demands for electricity,heating and cooling.Considering the schedulability of CSP and the low investment of photovoltaic(PV),an energy system including CSP and PV is designed to supply electricity.Aiming at the remote areas with multiple energy demands,a combined heat and power(CHP)unit and a CSP plant are assembled together to improve the thermal energy utilization.Buildings integrated with phase change materials are designed for heating and cooling storage.Furthermore,these two systems are modeled and explained respectively.Secondly,in order to ensure the short-term and long-term benefits of independent microgrids,a coordinated day-ahead scheduling of the CSP-PV system and thermal power units is formulated.Then a methodology for sizing the CSP-PV system based on the coordinated scheduling is proposed.The methodology takes into account the overall interests of independent microgrids and obtains the optimal configuration of the CSP-PV system by traversing method with the lowest equivalent annual cost as the goal.Finally,the coordinated day-ahead scheduling of the integrated system is formulated.CHP units can effectively improve the energy utilization of the CSP plants and the heat/cold storage capacity of phase change materials can relax the thermo-electric constraints of CHP units.This results in less solar energy curtailment,less heating/cooling waste and lower overall costs.The case study verified the feasibility and effectiveness of the proposed energy supply mode along with the proposed scheduling strategy.