摘要
用一台逆变器驱动两台永磁同步电机串联系统,可以通过控制不同平面的电压矢量实现对两台电机的独立解耦控制。该文提出在一台六相逆变器的六相平面和三相平面下同时注入旋转高频电压信号,通过解调静止坐标系下电流响应的负序分量来分别获得两台电机的转子初始位置角。同时为了提高观测精度,利用解调电流响应中正序分量所获得的误差角对解耦获得的转子初始位置角进行补偿。此外,对于六相串联三相永磁同步电机(PMSM)系统,考虑到系统中两台电机的浅磁饱和特性,在极性判断中利用了与传统单台永磁同步电机相反的结果来进行判断。根据该文所设计的旋转高频电压注入法,可以实现两台电机转子初始位置解耦观测。六相PMSM和三相PMSM的估计误差绝对值的平均值分别为3.72°和1.81°。最后,实验验证了所提观测算法的有效性。
In reality,through the special winding connection mode,it can be realized that only one set of driving systems controls the series or parallel decoupling and independent operation of multiple multiphase motors.It not only reduces the size of the system,but also saves much cost of designing the drive system.As the number of motors increases,the number of encoders used to detect rotor position angle and speed increases,and the cost increases.Therefore,sensorless control technology has become the main research direction in the field of motor control for pursuing low cost and high control accuracy.For permanent magnet synchronous motors(PMSM),especially six-phase series three-phase double motor systems,accurate decoupling observation of initial rotor position is the first step to realizing sensorless control of dual motors and the key to ensuring a smooth start.Therefore,this paper proposes a method of rotating high-frequency voltage injection to realize the decoupling observation of the initial rotor position of a six-phase series three-phase PMSM system.Firstly,rotating high-frequency voltages are injected simultaneously in the six-phase and three-phase planes,and the preliminary rotor position angles of the two motors are obtained by demodulating the negative sequence components of their current responses.Secondly,to improve the estimation accuracy,the error angle contained in the positive sequence component of the current response is extracted and used to compensate for the rotor position angle.In addition,the two motors are designed as shallow magnetic saturated PMSM to prevent the over-current caused by magnetic circuit saturation.When the pulse voltage of equal amplitude and width is applied to the positive and negative sides of d-axis,the current response amplitude of the d-axis forward is smaller than that of the reverse.Consequently,the polarity of the magnetic poles of the two motors is judged.As a result,the decoupled observation of the two motors’rotor initial position is completed.An experimental stud
作者
陈涛
周扬忠
屈艾文
钟天云
Chen Tao;Zhou Yangzhong;Qu Aiwen;Zhong Tianyun(Fujian Key Laboratory of New Energy Generation and Power Conversion Fuzhou University,Fuzhou 350116 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第8期2073-2085,共13页
Transactions of China Electrotechnical Society
关键词
六相串联三相永磁同步电机(PMSM)系统
旋转高频电压
浅磁饱和
转子初始位置
解耦观测
Six-phase and three-phase permanent magnet synchronous motor(PMSM)series-connected system
rotating high-frequency voltage
shallow magnetic saturation
initial position of rotor
decoupling observation
