Research On Risk Dispatching Strategy Considering Demand Response And Line Reliability

Power grid dispatching has always been an important part of the power system.The quality of the dispatching strategy is directly related to the stability and security of the power system.Because of the expansion of the power grid and the increase of the power load,greater demands are being placed on the economy and security of the dispatching strategy.The increasing of renewable energy and the deepening of power market reform have bought unprecedented uncertainty to the power system.In order to improve the stability and reliability of power system,aiming at the shortcomings of traditional dispatching methods,this paper focuses on risk dispatching strategies that consider demand response and line reliability.The main work is as follows:(1)There may be large fluctuation between the forecasting load and the actual load,and the plan based on a single forecast load lacks flexibility and reliability.Typical scenario set using similar daily loads is proposed to describe the load.The hierarchical clustering method is used to solve the problem that how to determine the number of clusters in the K-means clustering method.A demand response model including interruptible load and transferable load is further proposed.In the IEEE 118 node case,interruptible load,transferable load,and thermal power unit are used to deal with load scenarios of different forecasting deviation,and the effect is analyzed.(2)In order to improve the flexibility and reliability of power system dispatching,a two-stage grid risk dispatching decision method considering load fluctuation and transmission line reliability is proposed.Based on the hierarchical clustering of similar daily load to generate typical scenarios,the risk dispatching is decomposed into two stages: day-ahead period and real-time period.In the day-ahead period,the unit combination and output are arranged with the predicted load.In the real-time period,demand response including interruptible load and transferable load is taken into consideration on load side,which can provide dynamic correction compensation for the day-ahead power generation plan under typical load scenarios with different probabilities.At the same time,the “N-1” tidal flow in the real-time period is quantified as the risk value.Then risk value is introduced into the objective function,which is optimized together with the cost of power generation side and load side.The IEEE6 and IEEE118 node cases are analyzed with actual grid load of a certain place,and the validity of the model is verified.(3)“Regional Power Grid Whole-Process Risk Assessment and Dispatch Assistant System” is developed,which can make the risk assessment and provide the dispatching suggestion for three stages including day-ahead,day-in and real-time during the entire operation of the power system.The system is composed of a user-side system and a server-side system.The server-side system is responsible for the acquisition and integration of various types of information,and provides data support and computing support for each functional module.The user-side system provides corresponding requests to the server-side based on user's operations,and displays the results intuitively and efficiently.