Research On Control Model And Control Method Of Air Conditioning Loads For Renewable Energy Consumption

At present,as the problem of fossil energy depletion and environmental pollution is becoming more and more serious,more and more renewable energies are connected to the large power grid.However,due to the intermittency and volatility of renewable energy,a great deal of energy curtailment is made in order to meet the requirements of power grid security,stability,economic operation and power quality.The air conditioning load(ACL)has the characteristics of large quantities,fast response and heat storage characteristics,therefore it is an ideal dispatchable load.By changing the state of the clustered ACLs,the balance of power supply and demand can be meet.Therefore,with the increasing proportion of wind power generation and photovoltaic power generation,the utilization of ACLs to reduce the power curtailment will have great development prospects.The main work of this thesis is as follows:(1)Firstly,the way and the advantage of direct load control(DLC)to realize the control of ACLs is analyzed;Then,the first order differential model,discrete model and SQ linear model of a ACL are built,and the effects of each model are pointed out in this theis.The dynamic response of the ACLs at different temperature setting values and different diversity is studied by Monte Carlo simulation experiment The simulation results show that the power of the ACLs varies by temperature change,and diversity has inhibitory effect on power fluctuation.(2)Since the most current scheduling strategies did not fully consider the user’s comfort problem,this these proposes bidirectional selection mechanism based on dispatching center and user sides.Then,the two cluster model of cluster air conditioning based on different parameters and user tolerance values is established.The dispatching center selects ACLs based on the tolerance value of the users,so that the interests and comfort of the users can be fully considered.Besides,according to that the switch control leads to frequent ON/OFF,and the temperature control is easy to make the user uncomfortable,this paper proposes a dual stage ACL control method based on switch control and temperature control,and the cooperative mode of switch control and temperature control in this method is also discussed.This method combines the advantages of the two kinds of control methods,and reduce the burden of control of the dispatching center.By conducting the simulation,the effectiveness of the two clustering model and the dual stage control method proposed in this paper are verified.(3)According to the influence factors existing in actual application of ACLs in the wind power and photovoltaic power consumption,this thesis analyzes the influence on the consumption result.The communication delay problems,influence of outdoor temperature,load rebound problem and self-quit problem,are all analyzed in detail,and the corresponding solutions or suggestions are given in this thesis,which has the theoretical guidance meaning in practice.