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Three-level Inverter Direct Torque Control of Induction Motor Based on Virtual Vectors
Zhuohui Tan,Yongdong Li,Hu Hu,Min Li,Jie Chen 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
Multilevel inverter has attracted great interest in high-voltage high-power field because of its less distorted output. In this paper, a direct torque control (DTC) technique based on a three-level neutral-point-clamped (NPC) inverter is presented. In order to solve the intrinsic neutral-point voltage-balancing problem and to obtain a high performance DTC, a special vector selection method is introduced and the concept of virtual vector is developed. By using the proposed PWM strategy, a MRAS speed sensor-less DTC drive can be achieved without sensing the neutral-point voltage. The strategy can be verified by simulation and experimental results.<br/>
Position Sensorless Vector Control of the Brushless Synchronous Motor
Hongwu She,Bo Qu,Jingkui Shi,Zhuohui Tan,Jie Shen 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The position sensorless vector control scheme for the brushless excited synchronous motor based on the IGCT converter is presented in this paper. Since the instantaneous excitation current cannot be directly measured in this application, an adaptive rotor position and speed observer, which does not rely on the explicit estimation of the excitation current, is developed for the brushless excited synchronous motor. The roughly estimation of the excitation current is based on the average model of the excitation machine and the rotating rectification diode. The control algorithms are implemented and validated in a 2*27MVA motor pump-back test bench.
High-Performance Complex Controller for High-Power Converters with Low Pulse Ratios
Jingkui Shi,Jie Shen,Bo Qu,Hongwu She,Zhuohui Tan 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
For high-power converters with low pulse ratios (e.g. 80 Hz load frequency with 600Hz carrier frequency for a 27 MVA Variable Frequency Drive), the current control loop design has been a challenge due to the large signal delay and potentially higher-order plant (LCL filter between the converter and machines). The stability issue and cross-coupling effect is a problem in such application. In this paper, a complex current controller with excellent dynamic performance is proposed. The design is done by using the “double-sided frequency modeling” methodology. The stability, decoupling-effect, dynamic response and the robustness of the control loop are analyzed, which provides a design guideline for such applications. The performance of the proposed strategy and the improved state feedback method are compared. And finally simulation results are presented to validate the controller design and analysis.
Bo Qu,Jingkui Shi,Hongwu She,Jie Shen,Stefan Schroeder,Zhuohui Tan,Kunlun Chen,Jianmei Zhang,Yulong Li,Fan Zhang,Richard Zhang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, control strategies of a 22 MW / 27 MVA machine test bench using pumpback topology are introduced. The current loop design at extremely low pulse ratios (e.g. 600 Hz carrier frequency / 80 Hz load frequency) is developed. The system stability and dynamic response are analyzed. The challenges for high-power machine control with a sine filter and a transformer connected between the voltage-source-inverter and the machine are listed and solutions are given. Afterwards, some specific test modes are introduced as well. Finally, the control strategy is validated with the motor test at the customer site.