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Bin Ouyang
National Key Laboratory of Science and Technology on Vessel Integrated Power System, Naval University of Engineering, Wuhan, China

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Journal article
Published: 04 April 2019 in Electronics
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In the model reference adaptive speed observer, the induction motor supply voltage is used as the input of the reference model. However, measuring the supply voltage complicates the system and increases the cost, so the command voltage calculated by the controller is generally used instead of the actual supply voltage in the drive system. However, due to the nonlinear effects of the inverter, the voltage calculated by the controller is different from the actual supply voltage, resulting in a speed observation deviation. This paper analyzes the multiple effects that cause the three-level neutral-point clamped (TL-NPC) inverter output voltage and command voltage deviation. A voltage deviation compensation measure based on the volt-second balance principle is proposed. In this context, the expression of the rotational speed deviation caused by the voltage deviation is derived rigorously and in detail. Finally, the effectiveness of the voltage compensation measure is verified by experiments. The experimental results are basically consistent with the theoretical derivation expressions. The method and analysis in this paper is applicable to induction motor speed sensorless control systems driven by two-level and other multilevel inverters.

ACS Style

Peifei Li; Lei Zhang; Bin Ouyang; Yong Liu. Nonlinear Effects of Three-Level Neutral-Point Clamped Inverter on Speed Sensorless Control of Induction Motor. Electronics 2019, 8, 402 .

AMA Style

Peifei Li, Lei Zhang, Bin Ouyang, Yong Liu. Nonlinear Effects of Three-Level Neutral-Point Clamped Inverter on Speed Sensorless Control of Induction Motor. Electronics. 2019; 8 (4):402.

Chicago/Turabian Style

Peifei Li; Lei Zhang; Bin Ouyang; Yong Liu. 2019. "Nonlinear Effects of Three-Level Neutral-Point Clamped Inverter on Speed Sensorless Control of Induction Motor." Electronics 8, no. 4: 402.

Original article
Published: 05 February 2019 in Journal of Electrical Engineering & Technology
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This paper systematically investigates the ground current crosstalk (GCC) of high-power cascaded chopper braking circuit (CCBC). Turning on and off the IGBTs of the CCBC will generate GCC problem between the upper and lower chopper braking circuits. The GCC may cause the freewheeling diode to be hard-off, resulting in strong electromagnetic interference and serious losses, and even causing the freewheeling diode to fail due to reverse recovery. This paper establishes the ground current model of CCBC and the GCC is predicted base on the model. To minimize the influence of GCC, the solutions of inserting damping resistors to the ground current path and optimizing IGBT timing are proposed. The correctness of the analysis is verified by simulations and experiments. The proposed methods are of great significance for improving the reliability of high-power cascaded chopper braking devices and reducing electromagnetic interference and losses.

ACS Style

Peifei Li; Lei Zhang; Xiaofei Zhai; Bin Ouyang. Ground Current Crosstalk Analysis and Suppression in High Power Cascaded Chopper Braking Circuit. Journal of Electrical Engineering & Technology 2019, 14, 719 -731.

AMA Style

Peifei Li, Lei Zhang, Xiaofei Zhai, Bin Ouyang. Ground Current Crosstalk Analysis and Suppression in High Power Cascaded Chopper Braking Circuit. Journal of Electrical Engineering & Technology. 2019; 14 (2):719-731.

Chicago/Turabian Style

Peifei Li; Lei Zhang; Xiaofei Zhai; Bin Ouyang. 2019. "Ground Current Crosstalk Analysis and Suppression in High Power Cascaded Chopper Braking Circuit." Journal of Electrical Engineering & Technology 14, no. 2: 719-731.