Optimal Dispatch Of Power System Considering The Flexibility Of Demand Side And Power Generation Side

With the structure adjustment of the power supply side,the proportion of renewable energy such as wind power connected to the power grid is getting higher and higher.However,as the peak-to-valley difference of the power grid is increasing,and the new energy output such as wind power has the characteristics of uncertainty and anti-peak adjustment,the peak shift burden of the power system is greatly increasing due to the dual pressure of source side and load side,and the system needs more flexible capacity.The large-scale new energy integration is facing difficulties in terms of consumption.It is difficult to meet the peaking demand simply by relying on the existing adjustment capability of the system,and the flexible adjustment potential of the power system must be fully exploited to further promote the consumption of new energy.Therefore,it is of theoretical and practical value to study the power system optimal scheduling mode that considers the demand side response and flexible resources such as the thermal power flexibility transformation.In this paper,we study the optimal dispatch problem of wind power system considering the flexibility of demand side and power generation side,and deeply study the impact of demand side response and rapid thermal peak shaving on the wind power capacity of the power system,as follows:Firstly,the demand response theory research is carried out,and the demand response is classified from two aspects of measures and resources.The price demand response,the incentive demand response model and their related cost function are established.Then the demand side response resources are classified according to user categories.The load characteristics of typical industrial users,commercial users and resident users of power users are analyzed and the demand response model adapted to their power consumption characteristics is established,which lays a foundation for the establishment of power system scheduling model which considers multi-type demand response participation.Secondly,the main measures of the thermal power unit's flexibility transformation are studied.The peaking process of the thermal power unit is analyzed.The unit operating cost model considering the low-load fatigue life loss and the fuel cost of the thermal power unit is proposed,and the rapid depth of thermal power is considered.The peaking wind power system optimization scheduling model is used to study the effects of rapid deep peak regulation on the wind power consumption capacity of the system.The typical 10 machines system is used to analyze the example.The simulation results verify the correctness of the proposed model.Finally,considering the uncertain factors of wind power output,quantitatively assessing the risk of load shedding caused by fluctuations of wind power output,and aiming at the lowest comprehensive operating cost of the system,the optimized scheduling model of power system with wind power integration which considers multiple types of load demand response and thermal power operation flexibility is established.Besides,flow constraint is considered to ensure the security and stability of the system.The improved IEEE118 node system is used as an example to verify the effectiveness of the proposed model and method.