This paper proposes a virtual position-offset injection based permanent magnet temperature estimation approach for permanent magnet synchronous machines(PMSMs). The concept of virtual position-offset injection is math...This paper proposes a virtual position-offset injection based permanent magnet temperature estimation approach for permanent magnet synchronous machines(PMSMs). The concept of virtual position-offset injection is mathematically transforming the machine model to a virtual frame with a position-offset. The virtual frame temperature estimation model is derived to calculate the permanent magnet temperature(PMT) directly from the measurements with computation efficiency. The estimation model involves a combined inductance term, which can simplify the establishment of saturation compensation model with less measurements. Moreover, resistance and inverter distorted terms are cancelled in the estimation model, which can improve the robustness to the winding temperature rise and inverter distortion. The proposed approach can achieve simplified computation in temperature estimation and reduced memory usage in saturation compensation. While existing model-based approaches could be affected by either the need of resistance and inverter information or complex saturation compensation. Experiments are conducted on the test machine to verify the proposed approach under various operating conditions.展开更多
Permanent magnet synchronous motors(PMSMs)driven by voltage source inverters(VSIs)with pulse width modulation(PWM)are widely used.Given the impact of acoustic noise on the environment and human ears,the comfort level ...Permanent magnet synchronous motors(PMSMs)driven by voltage source inverters(VSIs)with pulse width modulation(PWM)are widely used.Given the impact of acoustic noise on the environment and human ears,the comfort level of the high-frequency vibration noise emitted by PMSMs has become an important factor.This study introduces the current mainstream high-frequency vibration noise suppression strategies for PMSMs by reducing the high-frequency current harmonics of stator windings,including spread spectrum technology,vector position exchange technology,and interleaved parallel technology.Furthermore,this study analyzed and compared the advantages and disadvantages of various suppression strategies.展开更多
A model predictive current control(MPCC)with adaptive-adjusting method of timescales for permanent magnet synchronous motors(PMSMs)is proposed in this paper to improve the dynamic response and prediction accuracy in t...A model predictive current control(MPCC)with adaptive-adjusting method of timescales for permanent magnet synchronous motors(PMSMs)is proposed in this paper to improve the dynamic response and prediction accuracy in transient-state,while lessening the computational burden and improving the control performance in steady-state.The timescale characteristics of different parts of MPCC,such as signal sampling,prediction calculation,control output,model error correction,are analyzed,and the algorithm architecture of MPCC with multi-timescale is proposed.The difference between reference and actual speed,and the change rate of actual speed are utilized to discriminate the transient state of speed change and load change,respectively.Adaptive-adjusting method of control period and prediction stepsize are illustrated in detail after operation condition discrimination.Experimental results of a PMSM are presented to validate the effectiveness of proposed MPCC.In addition,comparative evaluation of single-step MPCC with fixed timescale and proposed MPCC is conducted,which demonstrates the superiority of proposed control strategy.展开更多
针对并网风电场中,经典一次调频控制方法存在抗干扰能力弱、机组易脱网的问题,提出一种基于滑模变结构的风电机组一次调频控制算法。首先,在永磁同步风电机组工作原理的基础上,建立含有大电网的风电机组模型。其次,为了解决传统比例积...针对并网风电场中,经典一次调频控制方法存在抗干扰能力弱、机组易脱网的问题,提出一种基于滑模变结构的风电机组一次调频控制算法。首先,在永磁同步风电机组工作原理的基础上,建立含有大电网的风电机组模型。其次,为了解决传统比例积分微分(proportional integral differential,PID)控制下抗干扰能力弱的问题、引入经典滑模变结构控制器。然后,针对经典滑模变结构控制器导致执行机构存在抖振较多的缺点,提出一种基于sigmoid函数趋近率的滑模变结构一次调频控制算法。最后,通过MATLAB/Simulink对风电机组一次调频进行建模仿真,并与经典控制算法相比,验证了所提算法的可行性,在风速波动和电网故障的环境下,滑模变结构一次调频控制算法更具有效性。展开更多
目前工业上在对永磁同步电机(permanent magnetic synchronous motor,PMSM)进行控制时,常认为电流环的调节过程远快于转速环的调节过程,进而忽略电流环中反电动势扰动项的变化。但对于采用PI控制且机械时间常数与电磁时间常数相差不大...目前工业上在对永磁同步电机(permanent magnetic synchronous motor,PMSM)进行控制时,常认为电流环的调节过程远快于转速环的调节过程,进而忽略电流环中反电动势扰动项的变化。但对于采用PI控制且机械时间常数与电磁时间常数相差不大或更小的电机而言,若直接对电流环中的反电动势扰动项进行忽略,将会导致电机的动态响应性能恶化。为解决上述问题,本文首先建立了永磁同步电机调速系统的数学模型,并根据此数学模型推导了PI控制条件下电机动态性能变差的原因,以及反电动势扰动项能否进行忽略的条件,针对无法忽略的情况本文在传统内模控制的基础之上设计了一种二自由度内模控制器,该控制器具有2个可独立调节的参数,可分别调节电流环的跟踪特性与鲁棒特性和抗干扰特性。最后,利用Matlab/Simulink对所设计的二自由度内模控制器与传统的PI控制器进行对比仿真实验。结果表明,相比于PI控制器,所设计的二自由度内模控制器使电流环具有更好的跟踪性和鲁棒性,解决了特殊情况下电机动态响应性能变差的问题。展开更多
基金supported in part by the National Natural Science Foundation of China under Grant 52105079 and 62103455。
文摘This paper proposes a virtual position-offset injection based permanent magnet temperature estimation approach for permanent magnet synchronous machines(PMSMs). The concept of virtual position-offset injection is mathematically transforming the machine model to a virtual frame with a position-offset. The virtual frame temperature estimation model is derived to calculate the permanent magnet temperature(PMT) directly from the measurements with computation efficiency. The estimation model involves a combined inductance term, which can simplify the establishment of saturation compensation model with less measurements. Moreover, resistance and inverter distorted terms are cancelled in the estimation model, which can improve the robustness to the winding temperature rise and inverter distortion. The proposed approach can achieve simplified computation in temperature estimation and reduced memory usage in saturation compensation. While existing model-based approaches could be affected by either the need of resistance and inverter information or complex saturation compensation. Experiments are conducted on the test machine to verify the proposed approach under various operating conditions.
基金Supported by the National Natural Science Foundation of China(52207043)‘New Era Longjiang Excellent Master's and Doctoral Dissertations'Project Funding(LJYXL2022-054).
文摘Permanent magnet synchronous motors(PMSMs)driven by voltage source inverters(VSIs)with pulse width modulation(PWM)are widely used.Given the impact of acoustic noise on the environment and human ears,the comfort level of the high-frequency vibration noise emitted by PMSMs has become an important factor.This study introduces the current mainstream high-frequency vibration noise suppression strategies for PMSMs by reducing the high-frequency current harmonics of stator windings,including spread spectrum technology,vector position exchange technology,and interleaved parallel technology.Furthermore,this study analyzed and compared the advantages and disadvantages of various suppression strategies.
基金supported in part by the National Natural Science Foundation of China under Grant 52077054in part by the Natural Science Foundation of Hebei Province under Grant E2019202092+2 种基金in part by the China Postdoctoral Science Foundation under Grant 2021T140077 and 2020M681446in part by the State Key Laboratory of Reliability and Intelligence of Electrical Equipment under Grant EERI_PI2020002in part by the Funds for Creative Research Groups of Hebei Province under Grant E2020202142.
文摘A model predictive current control(MPCC)with adaptive-adjusting method of timescales for permanent magnet synchronous motors(PMSMs)is proposed in this paper to improve the dynamic response and prediction accuracy in transient-state,while lessening the computational burden and improving the control performance in steady-state.The timescale characteristics of different parts of MPCC,such as signal sampling,prediction calculation,control output,model error correction,are analyzed,and the algorithm architecture of MPCC with multi-timescale is proposed.The difference between reference and actual speed,and the change rate of actual speed are utilized to discriminate the transient state of speed change and load change,respectively.Adaptive-adjusting method of control period and prediction stepsize are illustrated in detail after operation condition discrimination.Experimental results of a PMSM are presented to validate the effectiveness of proposed MPCC.In addition,comparative evaluation of single-step MPCC with fixed timescale and proposed MPCC is conducted,which demonstrates the superiority of proposed control strategy.
文摘针对并网风电场中,经典一次调频控制方法存在抗干扰能力弱、机组易脱网的问题,提出一种基于滑模变结构的风电机组一次调频控制算法。首先,在永磁同步风电机组工作原理的基础上,建立含有大电网的风电机组模型。其次,为了解决传统比例积分微分(proportional integral differential,PID)控制下抗干扰能力弱的问题、引入经典滑模变结构控制器。然后,针对经典滑模变结构控制器导致执行机构存在抖振较多的缺点,提出一种基于sigmoid函数趋近率的滑模变结构一次调频控制算法。最后,通过MATLAB/Simulink对风电机组一次调频进行建模仿真,并与经典控制算法相比,验证了所提算法的可行性,在风速波动和电网故障的环境下,滑模变结构一次调频控制算法更具有效性。
文摘目前工业上在对永磁同步电机(permanent magnetic synchronous motor,PMSM)进行控制时,常认为电流环的调节过程远快于转速环的调节过程,进而忽略电流环中反电动势扰动项的变化。但对于采用PI控制且机械时间常数与电磁时间常数相差不大或更小的电机而言,若直接对电流环中的反电动势扰动项进行忽略,将会导致电机的动态响应性能恶化。为解决上述问题,本文首先建立了永磁同步电机调速系统的数学模型,并根据此数学模型推导了PI控制条件下电机动态性能变差的原因,以及反电动势扰动项能否进行忽略的条件,针对无法忽略的情况本文在传统内模控制的基础之上设计了一种二自由度内模控制器,该控制器具有2个可独立调节的参数,可分别调节电流环的跟踪特性与鲁棒特性和抗干扰特性。最后,利用Matlab/Simulink对所设计的二自由度内模控制器与传统的PI控制器进行对比仿真实验。结果表明,相比于PI控制器,所设计的二自由度内模控制器使电流环具有更好的跟踪性和鲁棒性,解决了特殊情况下电机动态响应性能变差的问题。
