Evaluation of Different Si/SiC Hybrid Three-Level Active NPC Inverters for High Power Density

Zhang, Li; Lou, Xiutao; Li, Chushan; Wu, Feng; Gu, Y. T.; Chen, Guang; Xu, Dewei

doi:10.1109/tpel.2019.2962907

Cited by 66 publications

(27 citation statements)

References 30 publications

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“…As far as the price of SiC devices is concerned, if all six switching devices in the ANPC topology are replaced with SiC devices, the high cost will limit the widespread application of such products. Considering this problem, many studies have proposed hybrid applications of SiC and silicon (Si) devices, that is, only some of the devices in a system or topology are replaced with SiC devices [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In [5], a Si CSI (current source inverter)/SiC VSI (voltage source inverter) series inverter system was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…This hybrid topology can increase efficiency by 66%. In addition, based on the diversity of ANPC topology commutation modes, various hybrid SiC and Si configuration schemes have also been proposed [8][9][10][11][12][13][14][15][16][17][18][19]. In [8][9][10][11], the outer tubes connected to the bus and clamp tubes in the ANPC topology were replaced by SiC devices.…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency of this SiC and Si ANPC topology under different modulation strategies was compared in [12]. In [13][14][15][16][17][18][19], the two tubes in the ANPC topology, except the outer tubes connected to the bus and clamp tubes, were replaced by SiC devices. In [13][14][15], specific SPWM (sinusoidal pulse width modulation) modulation strategies were applied to concentrate switching losses on SiC devices to achieve high efficiency and high power density.…”

Section: Introductionmentioning

confidence: 99%

“…In [16,17], new SVPWM modulations were used to concentrate switching losses on SiC devices. In [18,19], the efficiency comparison analysis of the two topologies (4SiC and 2SiC) was performed.…”

Section: Introductionmentioning

confidence: 99%

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A High-Efficiency Three-Level ANPC Inverter Based on Hybrid SiC and Si Devices

et al. 2020

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Silicon carbide (SiC) devices have excellent performance, such as higher switching frequency and lower switching loss compared with traditional silicon (Si) devices. The application of SiC devices in inverters can achieve higher efficiency and power density. In recent years, the production process of SiC devices has become more mature, but the cost is still several times that of traditional Si devices. In order to balance cost and efficiency, replacing only some of the Si devices with SiC devices in a topology is a better choice. This paper proposed a high-efficiency hybrid active neutral point clamped (ANPC) three-level inverter which has only two SiC devices and the other devices are Si devices. A specific modulation strategy was applied to concentrate switching losses on the SiC devices and reduce the on-state loss through parallel operation during freewheeling intervals. Theoretical efficiency curves and experimental verification of the proposed hybrid scheme with Si-only and SiC-only schemes were carried out.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A High-Efficiency Three-Level ANPC Inverter Based on Hybrid SiC and Si Devices

et al. 2020

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“…That is, when the fault-phase voltage is offset to this range, the fault point can not arcing, and the ground fault is effectively suppressed. Additionally, according to different application scenarios, the topology structure of the active inverter can be single-phase H-bridge, cascaded H-bridge, modular multilevel converter (MMC), and multi-material devices [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ]. In order to achieve the high voltage output of the active inverter, the multilevel topology or cascaded H-bridge can be adopted [ 44 , 45 , 46 , 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

Faulty Feeder Identification Based on Data Analysis and Similarity Comparison for Flexible Grounding System in Electric Distribution Networks

Liu

Zhang

et al. 2020

Sensors

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Reliability and safety are the most important indicators in the electric system. When a ground fault occurs, the electrical equipment and personnel will be greatly threatened. Due to the zero-sequence voltage/current sensor networks applied in the system, the fault identification and diagnosis technology are developing rapidly, including the application of ground fault suppression. A flexible grounding system (FGS) is a new technology applied to arc extinguishing in medium and high voltage electric distribution networks. Its characteristic is that when the single-phase ground fault occurs, the power-electronic-based device is put into the electric system to compensate and suppress the ground point current to be close to zero in a very short time. In order to implement the above process, the corresponding faulty feeder identification method needs to meet the requirements of rapidity and accuracy. In this article, based on the real-time sampled data from the zero-sequence current/voltage sensors, an improved faulty feeder identification method combining wavelet packet transform (WPT) and grey T-type correlation degree is proposed, which features both accuracy and rapidity. The former is used to reconstruct the transient characteristic signal, and the latter is responsible for calculating and comparing the similarity of relative variation trend. Simulation results verify the rationality and effectiveness of the proposed method and analysis.

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