Research On Source-load Dispatch Strategy Of Wind-fire System Based On Chp With Heat Storage

The problem of wind abandonment during the winter heating period of the "three north"areas has always been a bottleneck restricting the development and utilization of China's wind power resources,which directly affects the implementation and promotion of China's energy structure adjustment,energy conservation and emission reduction policies.There are three main reasons for the wind abandonment problem,which are considered from the point of view of the source grid load:the source side is that the wind power output is random,intermittent and fluctuating,and is limited by the heat and electricity operation mode of the cogeneration unit It is not conducive to large-scale wind power consumption in the power grid;the grid side is an area with sufficient wind energy resources,and often has insufficient self-containment capacity,and is limited by the transmission channel of the grid.It is very difficult to send wind power to the outside;the characteristics of inverse peaks restrict its scale of grid connection.To this end,from the perspective of decoupling thermoelectric coupling constraints,improving anti-peaking characteristics,and improving the regulation ability of the power system,this article discusses the necessity of using energy storage and price-type demand response to enhance the grid's wind power consumption capacity.In addition,in the context of the rapid development of energy interconnection,electricity and heat systems will be closely combined to form a comprehensive system with coordinated dispatching of electricity and heat.Fossil energy consumption and improving wind power grid-connected capacity are topics of research value.First,the working principle and thermoelectric characteristics of common cogeneration units are analyzed,and the influence of adding heat storage devices on the thermoelectric characteristics of cogeneration units and the decoupling mechanism of thermal storage devices are discussed.Based on the combined heat and power cogeneration unit with heat storage,the effect of adding battery energy storage on the thermoelectric characteristics of the system and the mechanism of absorbing and abandoning the wind are analyzed.Then,considering from the source side,in view of the conflict of electricity and heating during the winter heating period in the "Three North" region,a coordinated scheduling model for joint operation of heat storage combined heat and power generation units and battery-containing energy storage wind farms is established,using a combined heat and energy storage system The control characteristics of the system can realize the translation of energy in the space-time scale,thereby promoting the consumption of abandoned wind.The method uses time-shared electricity prices as a guide,with the goal of the largest combined power generation of combined heat and power and wind power;comprehensively considering the impact of electricity prices at various periods and the limit of the number of charge and discharge times for battery energy storage,comparing the single energy storage mode and the joint energy storage mode The wind curtailment effect and operating income.Simulation examples are solved in CPLEX software.The results verify the feasibility of the given method,which can effectively promote wind power consumption and increase system revenue.Finally,starting from both sides of the source and load,an optimized dispatch model of combined heat and power cogeneration unit with wind power generation and wind power generation considering the demand response and environmental protection cost is established.The source side uses a heat storage device to break the coupling constraint of CHP units to heat the electricity Side to integrate demand response to adjust the user's electrical load curve.By optimizing the output of each unit and the demand curve of electric load,the amount of wind power connected to the grid is increased,and the emission of sulfur and nitrate compounds is reduced.The model takes the minimum system operating cost as the goal,comprehensively considers the source-side environmental protection tax and Dutch-side user's electricity consumption satisfaction constraints,and solves it through CPLEX.Finally,taking the IEEE-30 node system as an example for analysis,the results of the calculation example show that the model can ensure the power quality of the user side while taking into account the operating cost of the power generation side,which can effectively promote wind power consumption and reduce pollutant emissions.