Research On Temperature Control Load Scheduling Strategy Based On Second-order Thermodynamic Model

With the improvement of the electrification on the power system demand-side and the enhancement of the large cities population agglomeration effect,the peak-to-valley difference of regional load has gradually widened,and the contradiction between local power supply and demand has further aggravated.In the power system,demand-side flexible load resources,such as thermostatically controlled loads(TCLs),have huge demand response potential.Effective use of such abundant demand-side resources can solve the current contradiction between power supply and demand.However,the optimal dispatching of power system requires higher accuracy and reliability of the demand response(DR).Therefore,it is of great significance to study the aggregate response model and dispatch strategy of TCLs.In this paper,the second-order equivalent thermal parameter model of TCLs for practical application scenarios is constructed based on the thermodynamic characteristics of TCLs.The equivalent energy storage model and its scheduling model are established based on the secondorder equivalent thermal parameter model of TCLs.Then,based on the response characteristics of TCLs in the scheduling,a cost model is established,and a market clearing method considering the participating of TCLs in the power market is proposed.The main works of this paper are as follows:(1)Based on the change of the TCLs DR model affected by the heterogeneity of the building environment and user preferences,this paper takes the second-order equivalent thermal parameter model to minimize the error between the simulated temperature and the measured temperature as the optimization goal,and proposes a parameter identification method of the second-order TCLs equivalent thermal parameter model with the parameter time-varying characteristics,and then a more accurate thermodynamic model of TCLs is established.(2)Based on the TCLs second-order equivalent thermal parameter model,the TCLs equivalent energy storage model established.Based on existing research,the charge and discharge power of TCLs equivalent energy storage model is redefined.The relationship between the heat exchange power of the equivalent energy storage model and the electrical energy storage is discussed,and the TCLs equivalent energy storage model is introduced into the day-ahead scheduling model by establishing corresponding constraints.The performance of the proposed model in day-ahead scheduling is more in line with the true response potential of the TCLs.(3)By DR characteristics of the second-order TCLs equivalent energy storage model in day-ahead scheduling,the cost model of the TCLs aggregator was established,and then non-increasing segmented bidding model of TCLs aggregator was established based on the marginal cost bidding strategy.Considering the effectiveness of the competitive power market with TCLs,an enhanced constraint model that considers the non-increasing segmented bidding of the TCLs aggregator is proposed to guarantee orderly power quantity settlement of each bid segment.To solve the inaccurate settlement problem caused by the non-increasing segmented bidding in the traditional power market optimization clearing model,which enables the TCLs aggregator to obtain economic benefits that match its response potential and cost in market competition.