Research On The Control Strategy Of Typical Load Under Flexible Load Aggregator

Power industry as the the most important basic energy industry in the development of national economy,plays an important role in promoting economic and social development and safeguarding national energy security.In recent years,the power industry has developed rapidly and achieved outstanding results,but it has also revealed some problems.Large scale renewable energy sources connected to power grid increase the randomness and volatility of the supply side.Because of the limited load capacity and consumption ability,the solar and wind can not be fully utilized.On the other hand,the continuous growth of new load proportion such as electric vehicles and the demand elasticity of traditional load under economic incentives increase the randomness of the demand side.It is difficult to achieve grid power balance and operation scheduling in the alternate electrical power systems with renewable energy sources which characterized by the strong randomness of supply and demand.In this background,the traditional mode which consider generate electricity as the only schedulable resource has been difficult to ensure the security,stability and economic of power system operation.So,the research aimed at enhancing the response level of demand side and utilizing flexible load to participate in grid collaborative control is gradually paid close attention to scholars both at home and abroad.Traditional power system has been running in "power load tracking" mode.Demand side flexible load as schedulable resource which can response grid requirements and balance power supply and demand has been regarded as passive load for a long time.The scheduling potential of this kind of load has not been used and therefore wasted.Because of the small load capacity and dispersed geographical location,power systems has no interest in managing individually.Flexible load has flexible scheduling mode and enormous potential through aggregate management.Though reasonable regulation strategy,flexible load can participate in electricity market.In addition,the advanced measurement system and energy management system are constructed to provide technical support for the aggregation management of the fragmentation resources in the demand side.The power system reform is developed to create a favorable external environment for the demand response.Therefore,it is necessary and feasible to aggregate and manage flexible loads.Though the precision and personalized control strategy,flexible load as the market main body individuation will easily involved in electric power market game and system coordinative optimization.This article focuses on the aggregate management of demand side flexible load and the formulation of control strategy.The main work content and research results are as follows:1.The concept of Flexible Load Aggregator(FLA)is put forward based on the characteristics of the demand side flexible load and the development demand of the alternate electrical power systems with renewable energy sources.The system architecture and unresolved key technologies of FLA are analyzed.The control structure,control mode and operation mechanism of FLA are studied.FLA as a virtual power generation and demand side response platform system within a wide range,aggregates demand side flexible Load though centralize-distribution architecture,and manages users in the form of "host" through signing contract.The consumption behavior of controlled equipment can be adjust to response to grid scheduling requirements and auxiliary service.2.Ice storage air conditioning are selected as the typical controlled object and its consumption characteristics and dispatch potential are analyzed.The working principle and key factors of ice storage air conditioning are expounded.The various operation modes and control strategies of ice storage air conditioning are compared.The dispatch potential of independent users is calculated quantitatively.3.According to different application scenarios,the control strategy and optimization model of ice storage air conditioning under the FLA are put forward,and verified by the simulation example.In the scenario that FLA participates in the system energy optimization,an optimized power utilization strategy is proposed to reduce the user operating cost and smooth the load fluctuation of the grid.In the scenario that FLA provides auxiliary service to power grid dispatch center,the peak averting strategy and curtailed wind consumption strategy are presented to meet the demand of the power grid and improve the priority in the user side.Through simulation results,the control strategies in this paper are proved effective at balancing the demand of grid and users.