A NPC IGBT based medium voltage inverter applied to salient pole wound rotor synchronous machine

Cunha, Gilberto da; Candido, Diogo Brum; Dias, Adriano da Silva; Sari, Marcio; Torri, Paulo Jose

doi:10.1109/cobep.2013.6785214

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The unreliable cycloconverter is replaced by a pulsewidthmodulated (PWM) voltage source inverter for energy conversion and control [9]. Pairs of parallel-connected 6.5-kV 600-A insulated-gate bipolar transistors (IGBTs) serve as the switching elements in a three-level topology [10], [11].…”

Section: A Medium-voltage Three-level Invertermentioning

confidence: 99%

Control of Large Salient Pole Synchronous Machines using Synchronous Optimal Pulsewidth Modulation

Holtz

Cunha

Petry

et al. 2014

IEEE Trans. Ind. Electron.

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High-power grinding mills are used in the cement and mining industries to crush clinker or copper ore and grind these materials to fine powder. The multimegawatt speed-controlled mill drives operate at a very low angular speed. Synchronous motors with a high number of pole pairs are used as the prime movers. They are traditionally fed by load-commutated thyristorized cycloconverters. These are prone to failure modes that can lead to excessive torque pulsations and high overcurrents. The huge stator, which was built as a separate ring-shaped structure around the tubular mill, may then get mechanically displaced, and the operation of the plant is interrupted. A novel and reliable direct drive uses a voltage source inverter that operates at the unity power factor for increased efficiency. Synchronous optimal pulsewidth modulation ensures a low harmonic current distortion and reduced switching losses at a very low switching frequency. The optimization of the pulse patterns takes the anisotropic magnetic properties of a separately excited synchronous motor into account. The implementation in a 23-MW semiautonomous grinding mill installed in a Zambian copper mine is intended.

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Section: A Medium-voltage Three-level Invertermentioning

confidence: 99%

Control of Large Salient Pole Synchronous Machines using Synchronous Optimal Pulsewidth Modulation

Holtz

Cunha

Petry

et al. 2014

IEEE Trans. Ind. Electron.

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“…Topologies with low number of levels, widely used in industrial high-power motor drives such as NPC and HNPC [10]- [18], have restrictions on output switching frequency due to the low number of switching devices in addition to the thermal limitations when operated at medium voltage applications. That limits the motor voltages maximum switching frequency, allowing only a few switchings per cycle, and consequently, carrier based and space vector modulations are not the most adequate choice for those applications.…”

Section: Introductionmentioning

confidence: 99%

FPGA Digital Architecture for Multilevel Synchronous Optimal PulseWidth ModulationWith Seamless Pulse Pattern Transitions

Lago¹,

Steckling²,

Heldwein³

2023

Eletrônica de Potência

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Multilevel medium voltage inverters have become an important technology in the power electronics industry to drive high-power motors.Since these converters are typically operated at very low switching frequencies, the use of modulation based on predefined switching patterns such as Synchronous Optimal Pulse Width Modulation (SOP) is advantageous. However, digital realization of this kind of modulator poses a challenge since the typical digital signal processors do not have a direct way to implement this type of modulation, and real-time modulator reconfiguration is typically used whenever the control strategy needs to change the count of switching per cycle of the fundamental. When implemented via software this leads to possible discontinuities in the process, imposes additional time restrictions and has the potential to cause currents and torque disturbances. This work presents a novel solution for the digital implementation of such a modulator based on multilevel waveform pattern decomposition that can handle switching patterns with different counts of switching per cycle in a single modulation structure, without requiring any dynamic reconfiguration. This, in addition to a hardware-based approach through an FPGA device, provide a modulation with very low harmonic distortion and seamless transitions when the number of switching per cycle is changed. The proposal is tested on an experimental setup of a 5-level NPC Hbridge (HNPC) inverter driving a Permanent Magnet Synchronous Machine (PMSM).

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A New Multinivel Converter Based on the Use of Interleaving Technique and Cascade Association

Queiroz

Oliveira

Praça

et al. 2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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A NPC IGBT based medium voltage inverter applied to salient pole wound rotor synchronous machine

Cited by 3 publications

References 8 publications

Control of Large Salient Pole Synchronous Machines using Synchronous Optimal Pulsewidth Modulation

Control of Large Salient Pole Synchronous Machines using Synchronous Optimal Pulsewidth Modulation

FPGA Digital Architecture for Multilevel Synchronous Optimal PulseWidth ModulationWith Seamless Pulse Pattern Transitions

A New Multinivel Converter Based on the Use of Interleaving Technique and Cascade Association

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