Aggregation Modeling And Application Of Air-conditioner In Power System

With the rapid increase of air conditioner load,the load characteristics have a great negative impact on the safe and stable operation of the system.On the other hand,the dispatch of air conditioner load is flexible and has little impact on users' comfort level,and it has great potential to participate in system scheduling after aggregation,which has become a world research hotspot.But at present,the research on the modeling of air conditioner aggregation and its application is still in the initial stage.In order to reduce the negative effects of air conditioner load on the grid,it is necessary to study the modeling of air conditioner load aggregation to fully tap its demand response potential,and maintain the safe and economical operation of power grid.In China's sales market,the share of inverter air conditioner is increasing day by day,and it has become the mainstream of air-conditioning industry.Based on the model of inverter air conditioner load in this paper,a control model for static voltage stability based on air conditioner load regulation and a control model for peak shaving based on the modeling of air conditioner load aggregation are established to promote the coordinated development of air conditioner load and power grid.Firstly,the necessity of air conditioner load aggregation and its participation in the operation of power system is analyzed and the purpose of modeling of air conditioner load aggregation is summarized.The research status of passive aggregation and active aggregation of air conditioner load is expounded in this paper respectively,as well as the application of air conditioner load in the operation of power system,which is laid the foundation for the follow-up research.Secondly,the first-order equivalent thermal parameters model is established for inverter air conditioner,and then the reduction potential and controlled time are researched considering human comfort.The system PV curve is obtained from the continuous power flow to calculate the system static voltage stability margin and the control mode of static voltage stability is proposed.On this basis,the control strategy of voltage stability and air conditioner load are put forward and simulated in the IEEE 14-bus system.The result shows that the air conditioner load is effective in improving the voltage stability of the system.Finally,a control strategy for peak shaving based on the modeling of air conditioner load aggregation is researched.Based on the model of inverter air conditioner,the relationship of inverter air conditioner between power and SOC and ambient temperature is deduced.Air conditioning load aggregation model is established,and the peak shaving potential of aggregated air conditioner is analyzed.The peak shaving scheduling plan for power company is set to minimize the power scheduling cost and meet the constraints of load aggregators output and the total amount of system peak load.The optimal control model of aggregated air conditioner load is established to maximize the profit of load aggregators and meet the constraints of load aggregators output and the changes of SOC state.The case study shows that the power demand of the air conditioner load can be changed by controlling the SOC state,and the proposed control strategy based on aggregated air conditioner load can play the role of peak shaving.