Proceedings ArticleDOI
Analysis of common mode voltage-"neutral shift" in medium voltage PWM adjustable speed drive (MV-ASD) systems
D. Rendusara,E. Cengelci,Prasad Enjeti,V.R. Stefanovic,W. Gray +4 more
- Vol. 2, pp 935-940
TLDR
In this paper, an analysis of common mode voltage or neutral shift in the new emerging voltage source inverter type medium voltage adjustable speed drive (MV-ASD) systems is presented.Abstract:
In this paper analysis of common mode voltage or "neutral shift" in the new emerging voltage source inverter type medium voltage adjustable speed drive (MV-ASD) systems is presented. Both cascaded multi-level (CML) inverter and 3-level NPC inverter topologies are analyzed. An equivalent circuit model to determine the common mode voltage stress is presented. Analysis and simulation results are discussed and worst case common mode voltage excursion is computed for an example 800 HP, 4160 V MV-ASD. It is shown that certain system components are excessively stressed and in the MV-ASD system these data are particularly useful in specifying system components and for proper design of the system. Possible effects of common mode voltage and its dv/dt on medium voltage motor bearings are discussed. A new. Multi-level PWM strategy is introduced which results in zero common-mode voltage. Simulation results are shown to illustrate the effectiveness of these schemes, Finally, experimental results from a 800 HP, 4160 V, MN-ASD system are presented.read more
Citations
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Journal ArticleDOI
Implementation and control of distributed PWM cascaded multilevel inverters with minimal harmonic distortion and common-mode voltage
TL;DR: In this article, the authors describe the implementation and control of an integrated power bridge, designed with its own digital signal processor and associated control circuitry to synchronize the multiple power bridges through a dynamically fast data communication network.
Journal ArticleDOI
A new modulation method to reduce common-mode voltages in multilevel inverters
TL;DR: Experimental results confirm that the proposed modulation strategy for multilevel inverters, which selects voltage vectors that generate zero common-mode voltage in the load, is highly effective and simple to implement in a modern microprocessor.
Journal ArticleDOI
Direct-Matrix-Converter-Based Drive for a Three-Phase Open-End-Winding AC Machine With Advanced Features
TL;DR: This paper describes how matrix converters, one at each side of a three-phase open-end-winding ac machine, achieve the following features simultaneously: machine phase voltage up to 1.5 times the input phase voltage in the linear modulation mode, extending the rated torque operation region to 150% of the rated speed of the machine.
Journal ArticleDOI
Hybrid Selective Harmonic Elimination PWM for Common-Mode Voltage Reduction in Three-Level Neutral-Point-Clamped Inverters for Variable Speed Induction Drives
TL;DR: Experimental results show that the proposed hybrid SHEPWM scheme could meet the modulation index need of the motor and reduce the common-mode voltage in the drive, and the two SHEP WM schemes could transition smoothly.
Journal ArticleDOI
A Virtual Space Vector Modulation Technique for the Reduction of Common-Mode Voltages in Both Magnitude and Third-Order Component
TL;DR: In this paper, a virtual space vector modulation technique was proposed to reduce both magnitude and third-order harmonic component of the common-mode voltage (CMV) in a two-level voltage-source inverter.
References
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Journal ArticleDOI
A new approach to enhance power quality for medium voltage AC drives
TL;DR: In this article, a new approach to medium-voltage variable-frequency static AC motor drives was proposed to improve the power quality of the motor by improving motor voltage and current waveforms.
Multilevel inverter modulation schemes to eliminate common-mode voltage
TL;DR: In this paper, it is shown that inverters which have an odd number of levels can generate zero common-mode voltage by switching among certain states, and therefore motor bearing currents will be eliminated and conducted electromagnetic interference (EMI) will be reduced.
Journal ArticleDOI
Source of induction motor bearing currents caused by PWM inverters
TL;DR: In this paper, it is shown that in an inverter-motor system, the common mode voltages generated by a PWM inverter, which are attributed to PWM switching harmonics, couple through parasitic capacitances from stator windings to the rotor body and then returns through the motor bearings to the commonly grounded stator case as a closed loop circuit.
Journal ArticleDOI
Multilevel inverter modulation schemes to eliminate common-mode voltages
TL;DR: In this article, the authors proposed an approach to eliminate common-mode voltage when using multilevel PWM inverters, which has an odd number of levels, by switching among certain states.