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Gaolin Wang,Ying Wang,Li Ding,Lei Yang,Ronggang Ni,Dianguo Xu 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6
Offline inductance identification of a permanent magnet synchronous motor (PMSM) is essential for the design of the closed-loop controller and position observer in sensorless vector controlled drives. On the base of the offline inductance identification method combining direct current (DC) offset and high frequency (HF) voltage injection which is fulfilled at standstill, this paper investigates the inverter nonlinearity effects on the inductance identification while considering harmonics in the induced HF current. The negative effects on d-q axis inductance identifications using HF signal injection are analyzed after self-learning of the inverter nonlinearity characteristics. Then, both the voltage error and the harmonic current can be described. In addition, different cases of voltage error distribution with different injection conditions are classified. The effects of inverter nonlinearities on the offline inductance identification using HF injection are validated on a 2.2 kW interior PMSM drive.
Offline Inductance Identification of PMSM with Adaptive Inverter Nonlinearity Compensation
Gaolin Wang,Ying Wang,Jiangbo Qi,Ronggang Ni,Wei Chen,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Offline inductance identification of permanent magnet synchronous motor (PMSM) is essential for self-tuning of closed-loop controller and position observer in sensorless vector controlled drives. This paper proposes an enhanced offline identification method fulfilled at standstill with adaptive inverter nonlinearity compensation for general-purpose drive applications. The d-q axis inductances can be obtained at standstill by using a voltage-sourceinverter fed drive. Influences of inverter nonlinearities on direct and quadrature inductance identifications exploiting high frequency (HF) voltage injection at different rotor positions are analyzed. Then an adaptive inverter nonlinearity compensation strategy employing a simple self-learning of compensation coefficients is proposed to enhance the accuracy of inductance identification. The feasibility of the proposed adaptive offline inductance identification method is validated on a 22kW interior PMSM.
Gaolin Wang,Bowen Wang,Nannan Zhao,Dianguo Xu 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
This paper presents a novel filtering method for speed measurements to improve the low-speed performance of the direct-drive permanent magnet traction machines for elevators. Based on the theory of nonlinear tracking differentiator (NTD), this method, which can act as a high performance filter of a raw speed signal, obtains a more accurate speed feedback signal when applying a low-resolution encoder. In addition, it can relieve the interference caused by the position derivative for speed sampling. By analyzing the frequency response of the NTD, the influence of its parameters on the performance of the speed filtering is investigated. Compared with different types of low-pass filters, the proposed method shows a shorter time delay and a stronger ability in terms of noise suppression when the parameters are selected carefully. In addition, when using the measured speed signal through a nonlinear tracking differentiator as the feedback of the system, the motor runs more steadily at low speeds. As a result, the riding comfort of a direct-drive elevator can be improved. The feasibility of the proposed strategy was verified on an 11.7kW elevator traction machine using a commercial inverter.
Wang, Gaolin,Wang, Bowen,Zhao, Nannan,Xu, Dianguo The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
This paper presents a novel filtering method for speed measurements to improve the low-speed performance of the direct-drive permanent magnet traction machines for elevators. Based on the theory of nonlinear tracking differentiator (NTD), this method, which can act as a high performance filter of a raw speed signal, obtains a more accurate speed feedback signal when applying a low-resolution encoder. In addition, it can relieve the interference caused by the position derivative for speed sampling. By analyzing the frequency response of the NTD, the influence of its parameters on the performance of the speed filtering is investigated. Compared with different types of low-pass filters, the proposed method shows a shorter time delay and a stronger ability in terms of noise suppression when the parameters are selected carefully. In addition, when using the measured speed signal through a nonlinear tracking differentiator as the feedback of the system, the motor runs more steadily at low speeds. As a result, the riding comfort of a direct-drive elevator can be improved. The feasibility of the proposed strategy was verified on an 11.7kW elevator traction machine using a commercial inverter.
Wang, Gaolin,Wang, Ying,Ding, Li,Yang, Lei,Ni, Ronggang,Xu, Dianguo The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6
Offline inductance identification of a permanent magnet synchronous motor (PMSM) is essential for the design of the closed-loop controller and position observer in sensorless vector controlled drives. On the base of the offline inductance identification method combining direct current (DC) offset and high frequency (HF) voltage injection which is fulfilled at standstill, this paper investigates the inverter nonlinearity effects on the inductance identification while considering harmonics in the induced HF current. The negative effects on d-q axis inductance identifications using HF signal injection are analyzed after self-learning of the inverter nonlinearity characteristics. Then, both the voltage error and the harmonic current can be described. In addition, different cases of voltage error distribution with different injection conditions are classified. The effects of inverter nonlinearities on the offline inductance identification using HF injection are validated on a 2.2 kW interior PMSM drive.
Bo Wang,Hongbo Wang,Yong Yu,Xin Lv,Gaolin Wang,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Nowadays, speed sensorless induction motor drives have been widely used in industrial applications. To improve the dynamic performance of the current loop, a sensorless robust predictive current controller combined with a speed adaptive full-order observer is presented in the paper. Based on the mathematical model of induction motor in discrete domain, the proposed controller is designed to replace the traditional PI controller. Compared with the PI control and traditional deadbeat predictive current control, the proposed method can significantly enhance the robustness of current feedback control. Meanwhile, a speed adaptive full-order observer is designed to obtain the motor rotor speed for the control scheme. The effectiveness of the proposed algorithm has been verified experimentally via a 3.7 kW electric drive system.
Robustness Improvement for Adaptive Full Order Observer in Sensorless Induction Motor Drives
Hongbo Wang,Wei Sun,Yong Yu,Gaolin Wang,Dianguo. Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The performance of adaptive full order observer for speed sensorless induction motor drives can be improved further though it has been researched for many years. A novel speed estimation algorithm with estimated rotor flux error and the corresponding feedback gain design method are proposed in this paper. Through Lyapunov’s theorem, the stability of proposed speed estimation algorithm is proved. The sensitivity of speed estimation to motor parameter deviation is reduced. Finally the feasibility of proposed two methods is verified by experiments.
Guoqiang Zhang,Gaolin Wang,Ronggang Ni,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
To suppress the position error harmonic ripples in back electromotive force (EMF) based methods for position sensorless interior permanent magnet synchronous motor (IPSMSM) drives, an adaptive notch filter (ANF) based harmonic self-compensated sliding-mode observer (SMO) is proposed. The inverter nonlinearities and flux spatial harmonics that induce the position error harmonic ripples are analyzed. The back-EMF information containing harmonics can be obtained through SMO, and then the least mean square (LMS) based ANF is adopted to realize back-EMF harmonic detecting and selfcompensating, thus eliminating the position error harmonic ripples. Due to the simple structure, the ANF based harmonic self-compensated SMO can be easily implemented on low-cost microchips with little computational burden. Experiments on a 2.2kW IPMSM sensorless vector controlled drive have been carried out to verify the proposed scheme.
Ronggang Ni,Gaolin Wang,Hanlin Zhan,Guoqiang Zhang,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes the extending application of permanent magnet synchronous machines (PMSMs) without damping windings, or non-line-start PMSMs (NLSPMSMs) to achieve effective soft start and synchronous switching from inverter drive to grid drive. The system electromechanical model during switching is deduced, and numerical analysis is adopted to verify the stability under grid drive. For the control strategy, two phase lock loops (PLLs) are adopted to obtain the phases of gird and inverter voltages. Then speed and current regulation is exerted to minimize the difference between inverter output and grid. Experiment results show that the 37kW NLSPMSM prototype can be safely switched to grid drive and robust to large load variation. Tested waveforms are coincident with numerical analysis.
Junya Huo,Hanlin Zhan,Gaolin Wang,Nannan Zhao,Dawei Ding,Lianghong Zhu,Dianguo Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the electrolytic capacitor-less PMSM drives, the LC resonance between small film capacitor in the DC bus and the inductance in the grid side is analyzed in this paper. Since the electrolytic capacitor is replaced by a small film capacitor in the DC bus, the LC resonance phenomena cannot be neglected, which will result in the underdamping characteristics of the electrolytic capacitor-less motor drives. Hence, the detailed model is established to reveal the resonance mechanism. Based on the model, a current harmonics suppression strategy is also proposed. The proposed control strategy can improve the power factor and reduce the current harmonics in the grid side. In addition, it can improve the system efficiency and enhance the stability of the drives. The proposed method is experimentally validated on an electrolytic capacitor-less PMSM drive applied in 1.5 HP variable frequency air-conditioner.