Improved NPC Inverters without Short-Circuit and Dead-time Issues

Khan, Ashraf Ali; Khan, Usman Ali; Ahmed, Hafiz Furqan; Cha, Honnyong; Ahmed, Shehab

doi:10.1109/tpel.2021.3103159

Cited by 20 publications

(8 citation statements)

References 42 publications

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“…As shown in (6), to obtain the coupled thermal impedance Z th(ha−xy) between IGBT modules, 1200W thermal loads are applied to the three IGBT modules respectively, then the temperature responses (T h(IGBT 1) , T h(IGBT 2) , and T h(IGBT 3) ) of the monitoring points (h1, h2, and h3) are recorded, and the heatsink-ambient coupled thermal impedance Z th(ha−xy) can be thereby obtained, as shown in Fig. 8 (b).…”

Section: ) Parameter Extraction Of Coupled Thermal Impedance Between ...mentioning

confidence: 91%

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Improved Temperature Monitoring and Protection Method of Three-Level NPC Application Based on Half-Bridge IGBT Modules

et al. 2022

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The overheating stress of power devices is the main cause of converter system failures, so real-time temperature acquisition, as well as timely over-temperature protection, under various operating conditions are key to achieving a more reliable energy conversion. In this paper, an improved threedimensional (3-D) coupled thermal model for insulated gate bipolar transistors (IGBTs) and related heatsink is constructed by considering the thermal coupling effects at both the device-and the module level. Furthermore, the coupled thermal impedance parameters are thereby extracted based on the finiteelement method (FEM), so that the dynamic loss and transient temperature distribution under actual working conditions can be obtained based on this electro-thermal coupling model. Meanwhile, to avoid the overheating damage of power devices due to untimely action of the negative temperature coefficient (NTC) thermistor over-temperature protection, this article aims at the idle IGBT device in the three-level neutral-point clamped (NPC) application using IGBT half-bridge modules, combined with the emitter terminal temperature, and finally realizes the multiple over-temperature protection settings. The improved temperature monitoring methods proposed in this paper are realized by the drive and control circuits and verified through simulation and experimental results.INDEX TERMS Reliability, half-bridge IGBT module, three-level NPC topology, temperature monitoring, over-temperature protection.

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Section: ) Parameter Extraction Of Coupled Thermal Impedance Between ...mentioning

confidence: 91%

“…Take the research object of this article, the three-level NPC inverter based on IGBT modules, as an example [6]. When the inverter is equipped with a motor load for speed regulation, the current is large and the speed is low at startup, which will inevitably cause large junction temperature fluctuations.…”

Section: ) For Condition Monitoringmentioning

confidence: 99%

Improved Temperature Monitoring and Protection Method of Three-Level NPC Application Based on Half-Bridge IGBT Modules

et al. 2022

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“…However, the NPC faces challenges such as power quality improvement, rejection of common mode voltage (CMV), DC-link capacitor balancing, and reliability limitations. 5,[7][8][9] To address these problems, several derived structures have been proposed. Among them, two configurations are widely studied and developed: the active NPC (ANPC) 1 and T-type (T-NPC) inverter, [10][11][12][13] which was used in this work.…”

Section: Introductionmentioning

confidence: 99%

“…Cascaded inverters synthesize output voltage by adding voltages from cascaded H-bridge cells, making them highly modular and capable of reaching higher output voltage. 5,6 Multilevel inverter configurations in medium and high power applications have been limited to synthetize threelevel output voltages because of the imbalance in its constituting DC link capacitor voltages and the need of complex driving circuit and control. These configurations have attained industrial maturity and are commercially available.…”

Section: Introductionmentioning

confidence: 99%

Simplified selective harmonic elimination PWM for three‐level five‐phase T‐NPC inverter

Bennacer

Bentafat

Benachour

et al. 2023

Circuit Theory & Apps

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SummaryThis paper presents a selective harmonic PWM strategy (HSE‐PWM) to control a five‐phase three‐level T‐NPC inverter. The proposed method aims to reduce switching losses and directly eliminate specific orders of harmonics, while also controlling the fundamental magnitude. MATLAB/Simulink simulations are conducted using an RL load, and the implementation is tested using a simplified method on an STM32F4 controller board. Experimental tests are then carried out to validate the simulation results. Additionally, power losses and efficiency are studied using Plecs software. The paper explores four different cases of switching angles number and proposes three SHE methods: a simple SHE based on Newton Raphson's method, SHE with current THD optimization, and SHE with common mode voltage (CMV) optimization using the PSO algorithm. The proposed methods provide complete control over the fundamental of the output voltage and the selected harmonics while reducing switching losses. A comparison is carried out in terms of voltage waveform, maximum CMV, fundamental magnitude, total harmonic distortion (THD), and power efficiency for the three methods. The paper concludes that the proposed modulation can be useful in high‐power applications.

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“…Khan et al introduce a neutral point clamped inverter, which consisted of single-phase and three-phase inverters. The inverter could avoid the operation failure during dead time, which would cause the distortion of the AC output waveform and THD problems [33].…”

Section: Introductionmentioning

confidence: 99%

A Novel VFVDC Optimized Full Bridge Inverter Control Strategy for Independent Solar Power Systems

Liu

Lin

et al. 2022

IEEE Access

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This research explored the independent solar power system (ISPS), including the maximum power point tracking (MPPT) technology and the DC (direct current) to AC (alternating current) full-bridge inverter (FBI) control technology. This study combined the perturb and observe (P&O) algorithm based on the output voltage control strategy and the proposed optimized FBI control strategy to the ISPS. The proposed variable frequency and variable duty cycle (VFVDC) optimized FBI control strategy had adjustable frequency and duty cycle. The proposed VFVDC control strategy was compared with the sinusoidal pulse width modulation (SPWM). When the output of FBI was at a low voltage level, the operating frequency was 10 kHz. Conversely, when the FBI gave a high voltage level output, the operating frequency was 1 kHz. This control improved the switching loss of 4 power MOSFETs in the FBI and thus improved the performance with a low harmonic amount. To further verify the explored system, this study used MATLAB to compare the proposed control strategy and SPWM control method. The simulation results verified that the proposed control strategy total harmonic distortion (THD) = 1.02% was better than the SPWM control method THD = 3.23%, then the low pass filter (LPF) volume was reduced. Finally, the actual ISPS was used for actual measurement and verification. The proposed control strategy had a low harmonic level, can operate stably and effectively, and thus be used for the actual fulfillment of electricity needs. INDEX TERMSVariable frequency and variable duty cycle control strategy, maximum power point tracking, solar power systems, full bridge inverter.

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Improved NPC Inverters without Short-Circuit and Dead-time Issues

Cited by 20 publications

References 42 publications

Improved Temperature Monitoring and Protection Method of Three-Level NPC Application Based on Half-Bridge IGBT Modules

Improved Temperature Monitoring and Protection Method of Three-Level NPC Application Based on Half-Bridge IGBT Modules

Simplified selective harmonic elimination PWM for three‐level five‐phase T‐NPC inverter

A Novel VFVDC Optimized Full Bridge Inverter Control Strategy for Independent Solar Power Systems

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