Research On Multiple Time Scale Dispatch Strategy Of Source-load-storage Considering Wind Power Accommodation

As environmental pollution and greenhouse effect become more and more serious,the strategic position of renewable energy has been constantly promoted.Replacing traditional fossil energy with clean energy will become one of the necessary measures for the sustainable development of global energy.And china attaches more and more importance to renewable energy and vigorously promotes clean substitution and electric energy substitution.In 2019,the national average wind power consumption ratio is 96%.However,due to the uncertainty of wind power output and the characteristics of anti-peaking,a large number of wind power grid connections have a certain impact on the stability of the power grid and the peaking capacity,which makes it difficult to further improve the wind power consumption ratio.Therefor,to promote wind power accommodation,reduce the pollutant emissions of the electric power industry,an environmentally friendly source-load-storage-multi-time scale dispatch strategy is proposed to consider wind power accommodation.Firstly,the current research status of wind power of wind power accommodation dispatch strategy at home and abroad is summarized.Based on the analysis of the main causes of is summarized in northern China,the characteristics of source-load-storage resources are analyzed,which lays a foundation for the establishment of the multiple time scale dispatch model.The source side mainly considers the wind power generation unit,the thermal power unit and the cogeneration unit,and the mathematical models of the three are established.The energy storage side mainly considers the energy storage battery,and the mathematical model of the energy storage battery is established.Then,the pollutant emission characteristics of power industry are studied.On the basis of exploring the working principle of desulfurization and denitrification device and flue gas dust treatment,the calculation method of SO₂,NO_x,flue gas dust,CO₂ and other pollutants discharged into the atmosphere is proposed,which lays a foundation for the subsequent consideration of environmental cost.Finally,the multiple time scale dispatch model of source-load-storage is established,which takes the environmental cost into account.In the day-ahead dispatch phase,considering the fuel and operation and maintenance costs of the traditional dispatching model,and taking into account the pollutants such as SO₂,NO_x,CO₂ and flue gas dust generated during the operation of the thermal power unit and the cogeneration unit,the environmental cost is included in the dispatching model,and then a dispatch model with the lowest total cost as the goal is established.On the basis of ensuring the safety and reliability of the system,the active power plan value of each unit is obtained through optimization.In the intraday dispatching stage,due to the uncertainty of wind power output,it is difficult to ensure the stable operation of the power system only by relying on the day-ahead plan.Therefore,a load regulation strategy based on the model predictive control is proposed.Through the ultra-short-term regulation of flexible adjustable load and energy storage system,rapid response is made to the uncertain output of wind power,so as to solve the power imbalance in the power system caused by the prediction error of wind power,and at the same time,it is helpful to reduce wind abandoning when wind power changes dramatically.The results of an example show that the proposed dispatch strategy can effectively improve the wind power accommodation and verify its effectiveness in reducing environmental pollution.