Performance Optimization Of Single Rotor Compressor For Household Air Conditioner Based On Near-Sparse Response Surface

In the research of frequency conversion energy saving technology,single rotor compressor has the advantages of high efficiency,low consumption and strong adaptability to the power grid.It is one of the core components of household inverter air conditioners to achieve stepless speed regulation and precise temperature control.However,due to the limitation of working conditions,single-rotor compressors cannot be installed with position sensors and there are periodic load fluctuations in their own structures.As a result,existing household inverter air conditioners still have large low-frequency speed fluctuations,which is easy to cause noise pollution.The sine fundamental wave feedforward compensation current method can effectively suppress the low-frequency speed fluctuation of the single-rotor compressor,and has obvious noise reduction effect.However,this method ignores the higherorder harmonic components in the load,resulting in unstable noise suppression effects;in addition,the simulation model of the motor control system is too costly when performing simulation optimization.Aiming at the problem of noise reduction control of single-rotor compressors,this paper proposes a performance optimization method for household airconditioning rotor compressors based on near-sparse response surface.The main contents and innovations are as follows:(1)On the basis of Hisense inverter air conditioner single rotor compressor,this paper analyzes the working principle and corresponding simulation model of the three major components of the compressor,compression pump,permanent magnet synchronous motor and motor control system.Firstly,the rotor force of the single-rotor compression pump is introduced.By acquiring the relevant data of the inlet and exhaust pressures at 1800 r / min,the load torque model is built on the MATLAB platform;then,the principle of motor control is discussed based on coordinate conversion,And built the mathematical model required for the optimization simulation of permanent magnet synchronous motors;then,the feedforward compensation module was built for the problem of excessive vibration of single rotor compressors at low frequency,and the corresponding motors of single rotor compressors were built based on Simulink Control system simulation model.Finally,it is proposed that there is a certain mapping relationship between the feedforward compensation current of the singlerotor compressor and the speed fluctuation,referred to as the black box model,and the coefficients of the feedforward compensation current are simulated and optimized using the whale optimization algorithm,and the black box model is verified.Effectiveness.(2)Due to the high cost of the simulation of the black box model,when the motor control system of the single-rotor compressor performs feedforward compensation simulation,the single simulation time of the motor control system based on simulink is long(about 10 seconds),which is not conducive to calling the black box model multiple Perform parameter optimization.In order to improve the simulation efficiency,this paper proposes to construct a near-sparse response surface model,also known as a proxy model,to approximate and replace the black box model,and introduces the construction method of near-sparse response surface in detail,including experimental design,basis function construction and coefficients Solve etc.Test cases show that the proxy model is close to the optimization results of the black box model(respectively 148.53 r / min and 143.50 r / min),and its optimization efficiency has been improved by about 324 times(the optimization time is 93.16 s and 30189.52 s respectively).(3)Supported by the project fund of the National Natural Science Foundation of China with the project number 5195125 "Efficient Simulation and Optimization Method for Multidomain Multiphysics of Complex Products Based on Sparse Spectrum",a single rotor compressor vibration test experimental platform was built to compensate for the first-order sine wave The effect is compared with the compensation effect of the feedforward compensation module based on the near-sparse response surface model optimization proposed in this paper.The vibration displacement,velocity and acceleration of single-rotor compressors under first-order sine wave feedforward compensation(46.4 μm,8.58 mm / s,1.59 m / s2,respectively)are all response surface model optimization compensation effects(25.7 μm,respectively),4.75 mm / s,0.878 m / s2)1.80 times,the results show that the feedforward compensation module composed of sine fundamental wave and higher-order harmonics proposed in this paper is more effective for the vibration suppression of single-rotor compressor under low-frequency operating conditions.For obvious.