A Wind Power Accommodation Dispatching Research Including Depth Peak Regulation Of Thermal Power Units Cooperated With Two Stage Demand Response

With the continuous growth of installed capacity of wind power in China,the problem of large-scale wind power consumption has become increasingly prominent.Especially in northeast of China,north China and northwest of China,In these regions,the combined heat and power units in the winter heating period have "set power by heat" constraints which cause the lack of adjusting load capacity of units,and the traditional thermal power units’ adjust load capacity is limited,So the units can not provide sufficient wind power interconnection space.At the same time,due to the reverse peak regulation characteristics of wind power,the combination of the two reasons cause the serious wind abandonment phenomenon in this area.To solve the serious wind abandonment problems,this paper proposes a CHP system which is suitable for winter lotus source coordination scheduling scheme of the region,the electric heat storage device decoupling combined heat and power units’ " set power by heat " constraints and transform the depth of the thermal power units to increase the load capacity,at the same time,in order to consume wind power more effective,we introduce two stage demand side response to coordinate with that model above.Firstly,in order to reduce the influence of the uncertainty of wind power output on the system,we should predict the wind power.In this paper,a combination prediction method based on XGboost-SVM-RF is proposed,and we establish the combination prediction model.Based on the measured data of a wind farm in northern China,we compare the influence of the combined prediction method and the XGboost algorithm,SVM algorithm,RF algorithm on the prediction accuracy of wine power.Then,we analyze the work principle of heat storage device and regenerative electric boiler,the principle of installing heat storage device to decoupling "set power by heat" constraints and the principle of wind power consumption by installing heat storage device coordinate with regenerative electric boiler.The process of deep peak regulation of thermal power unit is analyzed,which is divided into three stages:conventional peak regulation,steady combustion peak regulation without oil injection,and combustion assist peak regulation with oil injection,and we establish the cost function model of three stages.Based on the principles and models above,a scheduling scheme of combined heat and power system which including heat storage device,regenerative electric boiler and deep peak regulation of thermal power units is established.And then through simulation examples we analyze the positive influence of the scheduling scheme on wind power accommodation and system economy.Finally,we introduce a two-stage demand response to coordinate with the combined heat and power model above.In the day before,we introduces a price demand response based on consumer psychology model which based on the representative historical data and gives full consideration to the user’s response rule about the change of electricity price which is more in line with the actual users,and it can provide the greatest degree to peak load shifting in order to provide spaces for wind power accommodation.In intra-day it introduces the incentive demand response to cooperate with dispatch.It forms a coordinated absorption and abandonment wind dispatching scheme for integrating sources on the power generation side and demand side.An numerical example of a local power grid in the region shows that the two-stage demand response can fully mobilize the resources of the generation side and the demand side,it increases the wind power consumption capacity of the combined heat and power system and it can improve the economy of the system.