Research On Regulation Technology Of Inverter Air Conditioning Load Virtual Synchronous Machine For Fast Grid Frequency Modulation

With the rapid development of society and economy,the power load has increased on a large scale,and the installed capacity of generators has been rising continuously.At the same time,the peak-to-valley gap in the the grid is further widening,and the capacity utilization of generators continues to decline.In the summer power peak,air conditioning has become an indispensable equipment for people.In the context of flexible load regulation,inverter air conditioning loads are favored by flexible load regulation researchers due to their large number,wide distribution,and controllable power.Therefore,the inverter air conditioner is taken as the research object in this paper.Combining the traditional control model,control mode and adjustable potential analysis of the inverter air conditioner,the model and control mode of the inverter air conditioning load virtual synchronous machine group is studied.In this paper,a set of control technology and strategy for the inverter air conditioning load virtual synchronous machine group is proposed to participate in the interaction of power grid based on fast frequency identification.The main research of this paper is as follows:Firstly,the starting and stoping control and temperature control of the inverter air conditioner are studied,and the adjustable potential of the inverter air conditioner is analyzed.From the introduction of the operating principle of the inverter air conditioner,based on the decentralized inverter air conditioning modeling and its simulation,the two most common control methods of the inverter air conditioner are analyzed,which are starting and stoping control and temperature control.In order to effectively analyze the adjustable potential of inverter air conditioners in different operating states,an adjustable potential evaluation model based on virtual storage by air-conditioned room was established,and simulations of virtual storage were performed based on a single air conditioning model.Secondly,a virtual synchronous machine control model of inverter air conditioning load based on fast frequency identification was established.A virtual synchronous machine control model for the load of a inverter air conditioner is proposed,whose essence is to control the speed of the air conditioner compressor motor,so as to precisely regulate the load.Based on the operating principle of the inverter air conditioner,the the traditional control of inverter air conditioner is modified by load virtual synchronous machine controlling.A frequency identification algorithm suitable for air conditioning equipment to quickly measure the frequency of the power grid was proposed as the basis for the control of the air conditioning load virtual synchronous machine.A mathematical model for the control of the air conditioning load virtual synchronous machine is established,which is convenient for further analysis of the control strategy of the air conditioning load virtual synchronous machine.Finally,a control strategy for inverter air conditioning load virtual synchronous machine group is proposed to participate in rapid frequency modulation of power grid.A motor aggregation method is employed based on the homology of induction motors.An aggregation model of the inverter air conditioning load virtual synchronous machine group is established.The appropriate characteristic parameters of the air conditioning compressor motor are selected,fuzzy C-means clustering is used,and the equivalent motors are grouped After aggregation,a control model of the inverter air conditioning load virtual synchronous machine group is obtained.A control architecture for the inverter air conditioning load virtual synchronous machine group is proposed to participate in the grid interaction.Based on this architecture,a parameter adaptive strategy and a secondary frequency modulation strategy for inverter air conditioning load virtual synchronous machine groups are proposed to participate in the fast frequency modulation of the power grid.Based on the IEEE 2-machine and 5-node system,the frequency modulation simulation of the load virtual synchronous machine groups was performed on Simulink,which verified the correctness of the model and the effectiveness of the control strategy.