Integrated Power-Thermal Energy System Scheduling Considering Solar Thermal Unit Characteristics And System Safety Constraints

In China’s "Three Norths" and other regions,the space for new energy development has been greatly compressed due to the long heating cycle and the constraints of"heat for electricity" and other factors.Solar thermal power generation is flexible and controllable,and has the advantage of combined heat and power supply,so it can effectively improve the efficiency of new energy use.The aim of this paper is to ensure the safe and stable operation of the electricity-thermal integrated energy system,break through the coupling constraints of heat and electricity,and propose a scientific and reasonable method to alleviate the contradiction between supply and demand of heat and power,so as to achieve high efficiency,low energy consumption and new energy consumption.This paper therefore investigates the scheduling of integrated powerthermal energy systems taking into account the characteristics of solar thermal units and system safety constraints.The paper first analyses the operational characteristics of solar thermal power plants and the scheduling structure of the integrated power-thermal energy system,and establishes the operation mode of solar thermal units and the mathematical model of each sub-system of the integrated power-thermal energy system.Secondly,based on the characteristics of combined heat and power supply,the dispatching model of the integrated power-thermal energy system was constructed with the objective of minimizing the integrated operation cost and maximizing the new energy consumption.Through simulations of the 6-node power-6-node heat system and the actual winter heating system in the "Three Norths" region,the effectiveness of the proposed optimal scheduling model is verified,which can significantly improve the consumption of new energy and system economy.Finally,the N-1 check-and-add method is used to solve the integrated power-thermal energy system dispatching problem taking into account the N-1 safety constraint and the characteristics of the solar thermal units.The proposed model is analysed from the perspectives of power overrun,spare capacity and economic cost,with the objectives of minimising the integrated operating cost and the total amount of line overrun.This study will make use of the operating characteristics of solar thermal units and put electrical energy and thermal energy in the same framework to realize the dispatching of an integrated electric-thermal energy system,which can effectively reduce the abandoned light and reduce operating costs,and improve the safety of the coupled system.This study will provide a new solution to the problem of conflicting supply and demand for thermal energy and serious energy wastage in the "Three Norths" region of China,and will have certain reference and promotion prospects for energy conservation and emission reduction in China.