Current Dynamically Predicting Control of PMSM Targeting the Current Vectors

Hexu Sun,Kai Jing,Yan Dong,Yi Zheng 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

This paper present a current predicting control method for PMSM (permanent magnet synchronous motor) to improve the tracking performance of stator current, which regards the current vector as the control target. Solving the model state equation in the static frame (α-β frame), the dynamic change of current vector will be gained as three independent terms. These change terms, which contain the prediction of current vector, are discretized and simplified by Taylor series expansion and used to get the voltage vector as the predictive control quantity. SVPWM will transform the control voltage to the switching signal of inverter, which is newly deduced for the current vector. Simulation and experiment results are given to testy and verify the performance of this method.

Current Dynamically Predicting Control of PMSM Targeting the Current Vectors

Sun, Hexu,Jing, Kai,Dong, Yan,Zheng, Yi The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

This paper present a current predicting control method for PMSM (permanent magnet synchronous motor) to improve the tracking performance of stator current, which regards the current vector as the control target. Solving the model state equation in the static frame (α-β frame), the dynamic change of current vector will be gained as three independent terms. These change terms, which contain the prediction of current vector, are discretized and simplified by Taylor series expansion and used to get the voltage vector as the predictive control quantity. SVPWM will transform the control voltage to the switching signal of inverter, which is newly deduced for the current vector. Simulation and experiment results are given to testy and verify the performance of this method.

Torque Ripple Suppression Method for BLDCM Drive Based on Four-Switch Three-Phase Inverter

Pan, Lei,Sun, Hexu,Wang, Beibei,Su, Gang,Wang, Xiuli,Peng, Guili The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4

A novel inverter fault-tolerant control scheme is proposed to drive brushless DC motor. A fault-tolerant inverter and its three fault-tolerant schemes (i.e., phase A fault-tolerant, phase B fault-tolerant, and phase C fault-tolerant) are analyzed. Eight voltage vectors are summarized and a voltage vector selection table is used in the control scheme to improve the midpoint current of the split capacitors. A stator flux observer is proposed. The observer can improve flux estimation, which does not require any speed adaptation mechanism and is immune to speed estimation error. Global stability of the flux observer is guaranteed by the Lyapunov stability analysis. A novel stator resistance estimator is incorporated into the sensorless drive to compensate for the effects of stator resistance variation. DC offset effects are mitigated by introducing an integral component in the observer gains. Finally, a control system based on the control scheme is established. Simulation and experiment results show that the method is correct and feasible.

Torque Ripple Suppression Method for BLDCM Drive Based on Four-Switch Three-Phase Inverter

Lei Pan,Hexu Sun,Beibei Wang,Gang Su,Xiuli Wang,Guili Peng 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4

A novel inverter fault-tolerant control scheme is proposed to drive brushless DC motor. A fault-tolerant inverter and its three fault-tolerant schemes (i.e., phase A fault-tolerant, phase B fault-tolerant, and phase C fault-tolerant) are analyzed. Eight voltage vectors are summarized and a voltage vector selection table is used in the control scheme to improve the midpoint current of the split capacitors. A stator flux observer is proposed. The observer can improve flux estimation, which does not require any speed adaptation mechanism and is immune to speed estimation error. Global stability of the flux observer is guaranteed by the Lyapunov stability analysis. A novel stator resistance estimator is incorporated into the sensorless drive to compensate for the effects of stator resistance variation. DC offset effects are mitigated by introducing an integral component in the observer gains. Finally, a control system based on the control scheme is established. Simulation and experiment results show that the method is correct and feasible.

ESL--Z- Source Inverter

Pan, Lei,Sun, Hexu,Wang, Beibei,Dong, Yan,Gao, Rui The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.2

On the basis of the traditional ZSI (Z-source inverter), this paper presents a ESL-${\Gamma}$-ZSI, which uses a unique ${\Gamma}$-shaped impedance network and an extended SL network for boosting its output voltage in addition to their usual voltage-buck behavior. The inverter can increase the boost factor through adjusting shoot-through duty ratio and increasing the number of inductors. Capacitor voltage stress of ESL-${\Gamma}$-ZSI is a constant when 1>D>0, and ESL-${\Gamma}$-ZSI has small inductor current stress. The working principle of ESL-${\Gamma}$-ZSI and comparison with the classical ZSI and SL- ZSI are analyzed in detail. The power loss comparison between ESL-${\Gamma}$-ZSI and Cuk converter is analyzed detailedly. Simulation and experimental results are given to demonstrate the operation features of the inverter.

ESL-Γ-Z- Source Inverter

Lei Pan,Hexu Sun,Beibei Wang,Yan Dong,Rui Gao 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.2

On the basis of the traditional ZSI (Z-source inverter), this paper presents a ESL-Γ-ZSI, which uses a unique Γ-shaped impedance network and an extended SL network for boosting its output voltage in addition to their usual voltage-buck behavior. The inverter can increase the boost factor through adjusting shoot-through duty ratio and increasing the number of inductors. Capacitor voltage stress of ESL-Γ-ZSI is a constant when 1>D>0, and ESL-Γ-ZSI has small inductor current stress. The working principle of ESL-Γ-ZSI and comparison with the classical ZSI and SL- ZSI are analyzed in detail. The power loss comparison between ESL-Γ-ZSI and Cuk converter is analyzed detailedly. Simulation and experimental results are given to demonstrate the operation features of the inverter.

Analysis, Modeling and Control of a Non-grid-connected Source-Load Collaboration Wind-Hydrogen System

Jing Kai,Liu Chang,Cao Xin,Sun Hexu,Dong Yan 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5

Non-grid-connected wind power water-electrolytic hydrogen production system is an eff ective solution to wind power curtailment. However, the stability of the Source power supply is aff ected by the intermittent and volatility of the wind energy, which will lead to low effi ciency of hydrogen production on the Load. In this paper, a novel non-grid-connected Source-Load collaboration wind-hydrogen system is proposed to adapt to the variation of wind energy, which directly connects the Source wind turbines and the Load hydrogen production devices through a DC bus with a super capacitor group and auxiliary AC grid power supply. For the system, quasi-Z-source rectifi ers with a wide DC voltage adjustment range are developed for the Source and a modular proton exchange membrane (PEM) water electrolytic hydrogen production array is designed for adjusting the Load capacity. The basic architecture and the modelling method of the Source, the Load and DC bus are analyzed. A control strategy for the system is put forward to regulate the size of the PEM array with three diff erent operating modes and DC voltage collaboratively, by which the power fl ow management between the Source and the Load can be realized according to the wind power variation. Finally, two cases are carried out in the presence of diffi dent randomly varying wind power. The results show that the proposed non-grid-connected Source-Load collaboration of the wind-hydrogen system can maximize wind energy utilization of the Source and increase the effi ciency of hydrogen production of the Load in the case of wind power fl uctuations.

Cross-coupling control method of the two-axis linear motor based on second-order terminal sliding mode

Zheng Li,Qingshan Zhang,Jinfeng An,Huixian Liu,Hexu Sun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3

When the dual-axis linear motor is processing components, its accuracy will be affected by the uncertainty and nonlinearity of the system, and the complexity of the processing curve trajectory. The goal is to improve the machining accuracy and response speed of the XY dual-axis permanent magnet synchronous linear motor two-dimensional platform, improve the anti-interference ability, and reduce the contour error. This paper proposes a coupled control method based on dual closed-loop single-axis high-order terminal sliding mode position control (TSMC). First, an improved mathematical model of equivalent contour error is established. Combine the coordinated controller to get the coupling link. Then, to accelerate error convergence and suppress chattering, a high-order terminal sliding mode controller is designed. The single-axis current controller is designed using high-order sliding mode algorithms. Simulations and experiments show the effectiveness and feasibility of the proposed method.

Model predictive control of nine-switch converter with output filter for independent control of two loads

Pang, Yi,Zhang, Jingmei,Xu, Dongxing,Yin, Chang,Wu, Zifeng,Sun, Hexu,Pan, Lei The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1

This paper proposes a model predictive control (MPC) algorithm designed for nine-switch converter with output filter (NSCOF) to control two three-phase AC loads independently. A state function of each leg of nine-switch converter (NSC) is established to characterize the internal conditions of the NSC because the traditional model of the NSCOF does not involve the interior model of the NSC. Based on the NSCOF model with the state function of each leg, a prediction model of NSCOF is constructed. The two AC terminals of NSCOF are treated as one module when the MPC is designed. The proposed MPC achieves controlling two three-phase AC loads working under different frequency modes. Furthermore, this algorithm is independent of the modulation method for reducing the difficulty of the controller design and its limits. The simulation and experimental results reveal that the steady-state and dynamic response performance of NSCOF are substantially improved using MPC.

Full-coefficient Intelligent Adaptive Position Control of Permanent Magnet Synchronous Linear Motor

Li Zheng,Wang Kangtao,Wang Jinsong,Zhang Lucheng,Sun Hexu 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3

Permanent magnet synchronous linear motor (PMLSM) can directly convert electrical energy into mechanical energy. Compared with rotary motors, it can not only reduce the energy consumption of the system but also does not require an intermediate transmission device, which improves the operation accuracy and reduces the energy loss caused by mechanical structures such as gears. Given the increasing requirements for the control speed and accuracy of linear motors, a control method that considers both steady-state and dynamic performance is required. Therefore, this paper designs an intelligent adaptive position controller based on the motor characteristic model, and it can be seen through simulation and experiments that the controller designed in this paper has higher steady-state accuracy and faster response than traditional PI control. Speed and other advantages make the linear motor control system have both high control accuracy, fast response speed, strong robustness and other excellent performances, and can replace the work of traditional rotary motors with linear motors.