Research On Heat-electricity Combined Scheduling Method Of Peak Load Regulation Based On Heat Storage Electric Boiler In The Secondary Heat Supply Network

Due to its special geographical environment,the "Three North" region has severe problems of wind abandonment in the winter heating period.To solve this problem,scholars at home and abroad generally start from the solution of the thermoelectric coupling,and propose many solutions to solve the “power subject to heat” constrain of the thermal power units,low electric loads during the peak hours of winter heating at night,and a small proportion of wind power grid space,these solutions can all solve the severe problem of wind abandonment to some extent.The daily peak regulation of the electric boiler in the secondary heat supply network is a typical scheme for curtailed wind power accommodation,but the current research on this proposal does not consider the characteristics of the heating network.That is,the heat energy transmission of the heating network is assumed to be instantaneous transmission,which is obviously inconsistent with the actual situation.This paper discusses using the heat storage electric boiler to further accommodate wind power following the strategy of daily peak-load regulation by installing a heat storage electric boiler in the secondary heat supply network and based on the characteristics of the heating network,and establishes a set of optimal scheduling strategies for combined heat and power systems for the "Three North" region.Firstly,on the basis of taking into account the delay and attenuation characteristics of the heating network,the mechanism of two types of typical decoupled thermal power units to improve wind power accommodation with centralized configuration electric boilers at heat source and distributed configuration electric boilers at secondary heat supply network are analyzed.The optimal dispatching model of the electricity-heating combined system for two schemes are developed.Through example simulation,the effects of wind power accommodation and economy of the two schemes are compared and analyzed.Secondly,on the basis of the daily peak-load regulation scheme of the distributed electric boilers in the secondary heat supply network,a proposal is proposed to use the heat storage electric boiler to further accommodate wind power.The dissipating wind mechanism of the day-peaking scheme of the heat storage electric boiler with distributed configuration in the secondary heat supply network is analyzed.The mathematical model of the heat storage electric boiler is established,and the condition of electro-thermal conversion start-stop for the heat storage electric boiler is proposed.Finally,taking into account the delay characteristics and attenuation characteristics of the heating network,the dispatching model of the electricity-heating combined system based on the heat storage electric boiler for daily peak-load regulation at the secondary heat supply network is developed which uses the minimum total coal consumption of the system as the objective function.The improved particle swarm optimization algorithm to solve the model is studied to improve the optimization efficiency.The influence of heat storage capacity and wind power penetration capacity on the rate of wind power curtailment are compared and analyzed.The theoretical analysis and the example simulation show that the secondary heat network distributed configuration electric boiler scheme is better than the heat source centralized configuration electric boiler scheme in the effect of eliminating wind,and configuring the heat storage electric boiler at the secondary heat supply network can further accommodate wind power.The larger heat storage capacity of electric boiler,the lower the rate of wind power curtailment,the better the effect of eliminating wind.