In-depth Peak Shaving Strategy Of Thermal Power Units Considering New Energy Consumption

In recent years,wind power has developed rapidly and the scale of grid connection has been increasing.Due to the characteristics of wind power itself,the difference between the peak and valley of the system has increased,and the pressure of peak shaving has become more burdensome.At present,there is still a phenomenon that the proportion of thermal power units is too large in some areas of China.When wind power is connected to the grid,the peak shaving task is the responsibility of thermal power.With the increasing propurtion of wind power in the system,all parties hope that thermal power units can increase the depth of peak shaving..Although the deep peak shaving of thermal power units can absorb more wind power,the benefits and environment of the thermal power plant will be affected.Therefore,this paper establishes a peak shaving cost model to analyze the economics of the wind power grid-connected system from various angles and explore different scenarios.The operation strategy of the thermal power unit is analyzed,and the trend of energy efficiency with peak shaving depth in different scenarios is analyzed to find its optimal energy efficiency point.The research content is as follows:(1)By collecting and collating data,we can understand the current peak shaving capacity and current situation of thermal power units in China,summarize and analyze the basic situation of wind abandonment in various regions of the country,summarize the peak shaving methods of thermal power units and the peak shaving strategies adopted by our country,List the factors that affect peak shaving ability.(2)Introduce the peak shaving process of thermal power units,and divide the peak shaving process into three phases:conventional peak shaving,no oil injection depth peak shaving,and oil injection depth peak shaving..It is divided into three stages in total to establish the peak shaving cost model of the thermal power unit.Then,the peak shaving cost calculation is performed using a single thermal power unit of common capacity as an example to obtain Curves of energy consumption cost of thermal power units at different stages.Finally,considering the start and stop costs of the unit,and based on the premise of complete wind power consumption,an economic dispatch model is established to solve the given system to obtain the operating cost of the system in different scenarios.At the same time,the analysis shows that the fluctuation of the wind power output curve will affect The size of the system's operating cost and a reasonable abandonment of wind are a reasonable choice to reduce the impact of wind power output curve fluctuations.(3)Considering the severe wind abandonment in some areas of China,wind power is included in the economic dispatch model,considering the three uncertain factors of wind power forecasting error,load forecasting error,and unit random failure,and taking into account the operational risk indicators,the wind power generation expectation model is established Then,combined with the content of the economic dispatch model of thermal power units based on full acceptance of wind power,a deep peak shaving economic dispatch model of thermal power units that allow wind curtailment is established,and the Pareto optimal solution set of the multi-objective model is solved by NSGA-II algorithm,using entropy The weight method determines the best advantage of the solution set,and simulates with a 41-node system to analyze the economics of the scheduling scheme from multiple perspectives;finally explores the operation strategy of the thermal power unit in different scenarios,and solves the scenario A by establishing an energy efficiency model When performing deep peak shaving,the critical output of the thermal power unit should be set to 45%,which is in the phase of peak shaving without oil;when performing deep peak shaving under scene B,the critical output of the thermal power unit should be set to 50%,which is The peak shaving stage is not put in oil;when the depth peak shaving is performed in scene C,the critical output of the thermal power unit should be set to 40%,which is in the stage of peak shaving.The research conclusion can provide reference for dispatchers to formulate peak shaving service plans.