| Affected by resource endowment and energy characteristics,the renewable energy supply and consumption system based on wind power and photovoltaic bases,supported by advanced energy-saving thermal power around,assisted by flexible and adjustable energy storage equipment,and stable and reliable high-voltage external transmission lines as the carrier,will be the focus of China’s renewable energy planning and construction.Therefore,in order to solve the coexistence of the contradiction of new energy consumption,wind and solar abandonment and insufficient power supply capability in wind power and photovoltaic bases,the windphotovoltaic-thermal-storage combined transmission system with CSPP will become one of the characteristic energy development forms.However,the uncertainty of wind and solar and the high investment in energy storage equipment and external transmission lines seriously affect the optimal configuration of the system.Therefore,it is of great significance to consider the uncertainty of wind and solar,and coordinate the configuration of the electric energy storage,subsystems of CSPP and external transmission lines in the system to promote the system’s renewable energy consumption and low-carbon economic operation.The main contents of this dissertation are as follows:(1)The key factors that affect the consumption of renewable energy are analyzed,and the typical structure of wind-photovoltaic-thermal-storage combined transmission system with CSPP is designed.From the perspective of renewable energy and the power grid,the key factors affecting the consumption of renewable energy are qualitatively analyzed,and an evaluation model of dual factors affecting the consumption of renewable energy is established.The above key factors are quantitatively analyzed through an example in the soutnern Xinjiang region in Northwest China.On this basis,combined with the resource endowment of Northwest China,the typical structure of the wind-photovoltaic-thermal-storage combined transmission system with CSPP is designed,and its working mechanism is analyzed to provide the basis for the subsequent establishment of the optimal configuration model of the system.(2)Considering the autocorrelation and cross-correlation of wind and solar time series,a random scene construction method of wind-photovoltaic-thermal-storage combined transmission system with CSPP is studied.Combined with the survey data in the soutnern Xinjiang region in Northwest China,the time series characteristics of wind speed and solar intensity are analyzed from the perspectives of seasonal changes and daily changes.On this basis,through the four steps of “ LHS-based wind and solar random time series generation,autocorrelation time series generation,time series combination,scenes reduction and crosscorrelation scenes generation”,a random scene set of wind speed and solar intensity of four seasons considering time series autocorrelation and cross-correlation is finally generated.Through the comparative analysis of different scene construction methods,the superiority of this method is verified,and a basic guarantee is provided for the accuracy of the subsequent optimized configuration results of the system.(3)A multi-objective optimal configuration method of wind-photovoltaic-thermal-storage combined transmission system with CSPP under carbon trading is studied.A carbon trading model is constructed,and the carbon reduction mechanism of the system is analyzed from two aspects of low-carbon technology and low-carbon policy.The optimal configuration model of wind-photovoltaic-thermal-storage combined transmission system with CSPP under carbon trading with the highest system equivalent annual income,the maximum renewable energy consumption capacity and the lowest carbon trading cost is constructed,and the solution method of the model is given.Based on the comprehensive evaluation index and method of the system,the comprehensive evaluation model of the system is constructed.Taking the calculation example of the "14th Five-Year" power grid planning data in the southern Xinjiang region of Northwest China to conduct simulation,the optimal configuration scheme of the windphotovoltaic-thermal-storage combined transmission system with CSPP is obtained,and the effectiveness of the proposed scheme is verified.The research results of this dissertation can provide a certain reference for the construction of stochastic scenes considering the uncertainty of wind and solar,and the optimal configuration of multi-energy combined transmission system with CSPP. |
PDF Full Text Request