An Improved PWM Strategy for “SiC+Si” Three-Level Active Neutral Point Clamped Converter in High-Power High-Frequency Applications

He, Jiangbiao; Zhang, Di; Pan, Di

doi:10.1109/ecce.2018.8557800

Cited by 37 publications

(12 citation statements)

References 9 publications

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“…6 (a) is proposed. It uses the modulation strategy proposed in [15] where the inner switching devices (S1 -S4) are commutating at the carrier frequency and the outer switching devices (S5 -S6) are commutating at the fundamental line T frequency. In [16], the topology shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A High Efficiency and Low Cost ANPC Inverter Using Hybrid Si/SiC Switches

Woldegiorgis

Wei

et al. 2021

IEEE Open J. Ind. Applicat.

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This paper presents a performance investigation and design optimization of a high efficiency three-level Active Neutral Point Clamped (ANPC) inverter topology using hybrid Si/SiC switches. It uses a modulation strategy that produces a cluster of low frequency switches commutating at fundamental line frequency (realized with Si IGBTs) and high frequency switches commutating at carrier frequency (realized with hybrid Si/SiC switches) to facilitate a tradeoff between the inverter efficiency and cost. A generalized Si/SiC current rating ratio optimization algorithm is presented for the hybrid Si/SiC switches based on the power loss profile of ANPC inverter. This algorithm determines the optimal current rating ratio between the Si IGBT and SiC MOSFET for the hybrid Si/SiC switches based on the inverter operating specification and Si/SiC gate control technique to achieve the best tradeoff between cost, loss and reliability. The performance of the proposed ANPC inverter system is investigated and compared with other similar ANPC inverter systems. The proposed ANPC inverter system achieves higher efficiency compared to an all Si IGBT based ANPC inverter system, all SiC MOSFET based ANPC inverter system, and other ANPC inverter systems consisting mixed Si IGBT and SiC MOSFET devices. On the other hand, the semiconductor device cost of the proposed ANPC inverter system is much lower than an all SiC MOSFET based ANPC inverter system and the mixed Si IGBT and SiC MOSFET based ANPC inverter systems while it is on par with an all Si IGBT based ANPC inverter system.

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Section: Introductionmentioning

confidence: 99%

A High Efficiency and Low Cost ANPC Inverter Using Hybrid Si/SiC Switches

Woldegiorgis

Wei

et al. 2021

IEEE Open J. Ind. Applicat.

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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%

“…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. In [8][9][10][11], a medium-voltage MW-scale high-frequency SiC and Si ANPC inverter was introduced for both single-phase and three-phase pump-back tests.…”

Section: Introductionmentioning

confidence: 99%

“…In [8][9][10][11], the outer tubes connected to the bus and clamp tubes in the ANPC topology were replaced by SiC devices. In [8][9][10][11], a medium-voltage MW-scale high-frequency SiC and Si ANPC inverter was introduced for both single-phase and three-phase pump-back tests. Specific modulation strategy was developed so that the switches commutate only in smaller commutation loops where the loop inductance is kept at the minimum.…”

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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“…To overcome this problem, the active clamped diodes were replaced by active switches, achieving and an active neutral point clamped (ANPC) topology [9]. Although two more switches are used, it provides an additional switching state to facilitate loss distribution balancing for the whole system [10][11][12][13][14]. Among the many studies undertaken on new modulation schemes for controlling the ANPC converter, the authors of [15] proposed a new modulation scheme to perform a new commutation loop that offers better switching performance with lower stress on each switch.…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

2020

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Three-level converters are the most important technologies used in high power applications. Among these technologies, active neutral point clamped (ANPC) converters are mainly used for industrial applications. Meanwhile, recent developments have reduced losses and increased efficiency by using a hybrid combination of Si-IGBT and SiC-MOSFET switches to achieve hybrid ANPC (HANPC) converters. Open-circuit failure is regarded as a common and serious problem that affects the operational performance. In this paper, an effective fault-tolerant method is proposed for HANPC converters to safely re-utilize normal operation and increase the reliability of the system under fault conditions. Sequentially, regarding different topologies with reference to earlier fault tolerance methods which could not be applied to the HANPC, the proposed strategy enables continuous operation under faulty conditions effectively without using any additional devices by creating new voltage references, voltage offset, and switching sequences under the faulty conditions. Consequently, no additional costs or changes are associated with the inverter. A detailed analysis of the proposed strategy is presented highlighting the effects on the voltage, currents, and the corresponding total harmonic distortion (THD). The simulation and experimental results demonstrate the capability and effectiveness of the proposed method to maintain normal operation and eliminate the output distortion.

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An Improved PWM Strategy for “SiC+Si” Three-Level Active Neutral Point Clamped Converter in High-Power High-Frequency Applications

Cited by 37 publications

References 9 publications

A High Efficiency and Low Cost ANPC Inverter Using Hybrid Si/SiC Switches

A High Efficiency and Low Cost ANPC Inverter Using Hybrid Si/SiC Switches

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

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

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