Research On Aggregation Model And Elaborative Regulation Strategy Of Residential Heterogeneous Flexible Loads

Large-scale integration of renewable energy is inevitable in the development of Newtype Power System,and the adjustment of energy consumption structure on the demand side is also an essential requirement for intelligent energy systems.With the gradual popularization of a large number of residential loads,load cluster control has become an effective method to consume renewable energy and promote the economic and safe operation of the power system,because these loads have the characteristics of flexible dispatching and virtual energy storage.Although the amount of residential flexible loads is large,which can form aggregation effect,the heterogeneity of their parameters,types,and user behavior diversity increase the difficulty of control.On this basis,it is a hot issue that how to tap the existing controllable potential of heterogeneous flexible loads to contribute to the safe and economic operation of the power system.With the development of energy internet,the demand and forms of residential energy consumption have gradually diversified.Residential flexible loads are gradually becoming available in various energy forms.Residential energy conversion equipment,heating load,electrical load,etc.can constitute multi-energy heterogeneous loads.Therefore,it is a further issue that how to aggregate and coordinate these loads to improve the security and economic operation capability of multi-energy systems.Starting from the development path of smart grid,energy internet,and new-type power system,flexible load control requirements in terms of scenario evolution.implementation route upgradation,and key technology optimization are discussed.For specific technical requirements,corresponding optimization solutions are proposed from the aspects of residential flexible load aggregation and load control in electrical and multienergy scenarios.Finally,this thesis aims to achieve the reasonable development and utilization of flexible loads on demand side under the widespread penetration of renewable energy.It mainly includes the following contents:(1)Based on the existing load control framework and technology.the implementation framework of electrical heterogeneous flexible load control technology is proposed.The ubiquitous heterogeneity of residential flexible loads is analyzed from the aspects of parameters,types,and levels.The modeling and regulation difficulties brought by heterogeneity are discussed in depth.Based on the two characteristics of green power and multiple energy in the new-type power system,the evolution route and key technologies from electrical load control to multi-energy load control are proposed.The technical system of residential heterogeneous flexible load control is constructed.which provides a clear direction for load control development.(2)Focused on the time-space characteristics of flexible loads,the dynamics of typical flexible loads such as electric vehicles(EVs)and thermostatically controlled loads(TCLs)are aggregated in the time domain.Then a charging selection model of electric vehicles based on global information sharing is constructed,which depicts the charging behaviors changing process of large-scaled cross-regional electric vehicles.Based on this,the spatial aggregation model is established.Finally,a heterogeneous flexible load aggregation model considering the characteristics of multiple space-time scales is constructed,and more controllable potential is explored.(3)Considering the dynamic characteristics of heterogeneous flexible loads under conventional scheduling scenarios,the dynamic state evolution rule of large-scale groups is estimated by constructing a state space model and estimate situation of load population under multiple time scales.Further,based on the characteristics of response mode,dynamic power rebound,response cost,a fast control strategy of heterogeneous flexible loads for the economic operation of power system is designed to achieve the economic optimization.(4)Considering the dynamic characteristics of heterogeneous flexible loads under the emergency scenario of low frequency,a connection-oriented load instantaneous state estimation and correction method is proposed.The dynamic state of large-scale flexible loads can be calculated.Then,based on the characteristics of response rate and power rebound,a fast control strategy for heterogeneous flexible loads for the safe operation of power system is constructed.In this emergency scenario,the frequency drop of the system is effectively restrained and the operation safety is improved by adopting the proposed strategy.(5)Considering the multi-energy coupling characteristics of heterogeneous flexible loads in energy internet,carbon reduction is taken as the target to optimize residential energy dispatch when multi-energy heterogeneous flexible loads are coordinated and controlled.Then,a random low-carbon operation model is built,and the differentiated demands of hot water,heating,EV charging are considered to form a coordinated optimization and control strategy for residential multi-energy heterogeneous loads.Finally,residential energy consumption requirements and low-carbon goals can be achieved by multi-energy heterogeneous load control.