Low-carbon Economic Dispatch Of Power System Based On Demand Response And Carbon Capture Technology

Low carbon power is the development trend of power system in the future.For this reason,our country vigorously develops clean energy sources technology.Among them,the installed capacity of wind power is increasing year by year.But limited by its randomness and volatility,large-scale grid connection has caused frequent wind curtailment phenomenon and further widened the peak-to-valley difference of the net load of the power system.Although traditional thermal power plants can adjust output to cope with wind power fluctuations.Their regulation capacity is limited and their carbon emission is high,which is contrary to the current goal of low-carbon power.And through carbon capture technology,traditional thermal power plant can be transformed into carbon capture power plant.Carbon capture power plant has great regulation performance while providing low-carbon power.It is an ideal power supply for wind power.However,its energy consumption of carbon capture is high.And it is easy to conflict with peak load.It leads to a decline in carbon capture levels.Demand response can achieve peak load shifting.It can promote the output of low-carbon units and improve the level of carbon capture.It will realize low-carbon operation of power system on load side.Therefore,this paper studies the coordination of wind power and carbon capture power plants,supplemented by peak load shifting of demand response.Finally,it can realize low-carbon economic dispatch of power system.Firstly,this paper clarifies the structure of carbon capture system and their main sources of energy consumption.Based on this analysis,the operating characteristics of the carbon capture power plant are analyzed,and the correspondence between the energy flow and carbon dioxide flow in the carbon capture power plant is determined.It is studied that the energy time-shift characteristics of its internal liquid storage tank.Then the flexibility of scheduling is studied,laying a theoretical foundation for subsequent coordination with wind power.At the same time,considering the peak load shifting characteristics of the load-side price-based demand response.Its low-carbon mechanism in coordination with source-side carbon capture power plants is studied.And it can provide a theoretical support for the source-load coordinated low-carbon economic dispatch.Secondly,considering low carbon mechanism that the coordination of demand response and carbon capture power plants,a two-stage model is constructed.The objective of the first stage model is to minimize the sum of squares of load fluctuation,and considers user satisfaction constraints to construct an price-based demand response model.The second stage model takes into account the low-carbon characteristics of carbon capture power plants based on the load determined by the first stage model.And aiming at the lowest overall cost,constructing a power system low-carbon economic dispatch model.The results of calculation examples show that the source-load coordination can effectively reduce carbon emissions.Thirdly,in order to cope with the peaking pressure caused by the strong wave performance of wind power and the goal of low-carbon electricity.The energy time-shift characteristics of liquid storage tanks in carbon capture power plant are considered while introducing demand response.Aiming at the lowest overall cost,the low-carbon economic dispatch model of the power system with integrated and flexible operation mode of carbon capture power plants is builded.The results of calculation examples show that the coordinated peak load shifting on both sides of the source and load can effectively reduce carbon emissions and ensure economy.Finally,in order to promote wind power accommodation and and low carbon development,considering that the accuracy of wind power forecasting increases with the shortening of the forecast time scale,while taking into account the deeper adjustment range and faster adjustment rate of carbon capture plants.Proposing a multiple time scales low-carbon economic dispatch model for the power system considering demand response and carbon capture power plants.In the day-ahead stage,determining the start and stop of the thermal power units.In the intra-day stage,determining the output of the thermal power units.In the real-time stage,the net output adjustment plan of carbon capture power plants is determined.The example results show that the carbon capture power plant can provide low-carbon power while flexibly adjusting the output to follow the changes of wind power and load,so as to reduce wind curtailment and load loss.In addition,the demand response on the load side can peak load shifting.Finally,low-carbon economic dispatch of the power system can be realized.