High-speed Permanent Magnet Synchronous Motor Control System For Hydrogen Fuel Cell Centrifugal Fans

Due to the working condition requirements of hydrogen fuel cell centrifugal fan drive motors,high-speed permanent magnet synchronous motors are more suitable for use as drive motors for hydrogen fuel cell centrifugal fans compared to ordinary permanent magnet synchronous motors.At present,the drive motor speed of hydrogen fuel cell centrifugal fan is mainly concentrated between 15,000-50,000 rpm,and the highest is 80,000 rpm,so this thesis will target on the research of 40,000 rpm algorithm optimization and 120,000 rpm breakthrough research.However,the control of high-speed permanent magnet synchronous motor needs to cope with high speed and counter potential,which requires high motor current response capability and control accuracy;the main difficulty in its control is the design and optimization of control algorithm.The purpose of this thesis is to propose a systematic solution for the high-speed control scheme of a permanent magnet synchronous motor in the hydrogen fuel cell centrifugal fan operating conditions.In order to achieve this purpose,the high-speed permanent magnet synchronous motor control system is thoroughly analyzed and studied in this thesis,and three links of super-helical sliding mode observer,small capacitor rectifier circuit,and hardware phase shifting circuit are selected for the study.The Super-Twisting Algorithm is improved to optimize its parameter selection capability and to improve the jitter problem by using it as the convergence rate of the sliding mode observer,by choosing a small capacitor rectifier circuit instead of a large electrolytic capacitor rectifier circuit,and by improving the phase shift circuit for high-speed permanent magnet synchronous motors.The article firstly introduces the background,significance,research status and development trend of the research topic,then analyzes the mathematical model of high-speed permanent magnet synchronous motor in both stationary and rotating cases and introduces the principle of vector control,then the article builds and simulates the vector control system of high-speed permanent magnet synchronous motor,and then studies the common sliding mode observer in vector control.The sliding mode observer is briefly introduced and an improved second-order superhelix sliding mode control strategy is proposed.Finally,the software and hardware implementation of the high-speed permanent magnet synchronous motor control system in this thesis is introduced in detail and the feasibility of this system is analyzed experimentally.In this thesis,for the 40,000 rpm working condition of the high-speed permanent magnet synchronous motor,the global search characteristic of the Beetle Antennae search algorithm is used to improve the Grey Wolf Optimization algorithm,so as to avoid the local optimum problem of the gray wolf algorithm,and then the improved gray wolf optimization algorithm is used to calculate an expected value,and then the expected value and the actual value are substituted into the formula as the system parameter variables of the second-order Super-Twisting Algorithm,so as to realize the second-order Super-Twisting Algorithm in terms of parameter selection capability and convergence speed of the improved second-order Super-Twisting Algorithm as the convergence rate of the sliding mode observer an improved second-order superhelix sliding mode observer is designed to suppress the jittering problem of the existing sliding mode observer.This improved sliding mode observer has better robustness and immunity to perturbation and is better able to adapt to complex operating environments and changing operating conditions demands.Second,for the high-speed permanent magnet synchronous motor drive circuit board,this thesis uses a small capacitor rectifier circuit instead of a large electrolytic capacitor rectifier circuit,which not only improves the space utilization of the drive board but also reduces the cost and avoids the problem that large electrolytic capacitors are prone to aging and failure.In this thesis,an improved hardware phase-shifting circuit is designed for 120,000 rpm operation of high-speed permanent magnet synchronous motors to assist the rotor position detection algorithm in 120,000 rpm square wave control operation for accurate detection of motor rotor bits.In this thesis,physical tests are conducted using the physical equipment of Suzhou E-Drive Intelligent Technology Co.,Ltd.The results show that the improved second-order super spiral sliding mode observer maintains good convergence speed and anti-disturbance while the small capacitor rectifier circuit and the improved phase shifting circuit show their own advantages and meet the requirements of stable voltage and rotor position detection during high-speed operation.