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

Feng, Zhijian; Zhang, Xing; Wang, Jianbo; Yu, Shaolin

doi:10.3390/en13051159

Cited by 28 publications

(15 citation statements)

References 17 publications

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“…It is worth mentioning that three-level converters are the most popular choices in the family of multilevel converters and the most available in different industrial applications. Compared with other multi-level topologies, three-level converters have low switching losses, smaller AC side filter size, and less complexity, as well as the lowest associated costs [36]. Among all the existing three-level topologies, the NPC converters are the most popular topologies [24,37].…”

Section: Physical Model Of Hanpc Invertersmentioning

confidence: 99%

“…Nevertheless, in some of the fault scenarios, the inverter has to be controlled with decreased MI. Furthermore, some studies consider the diagnosis and fault tolerance for different T-type and NPC inverters as shown in [31][32][33][34][35][36]. In these studies, the diagnosis was performed for the open-circuit fault within the proposed topology concerning the turn-on time for fault control.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Physical Model Of Hanpc Invertersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…However, briefly after the commercial introduction of SiC power devices, when the SiC technology was still relatively new, the cost of such power devices was significantly higher compared to conventional Si IGBTs. Thus, different hybrid Si/SiC ANPC topologies were introduced, in which SiC MOSFETs can be applied as the power devices for two or four out of six devices per leg depending on the preferred PWM technique, showcasing satisfactory results in terms of achieving a balance between cost and performance [18][19][20][21][22]. Nevertheless, even though the hybrid topologies should be considered when the cost is taken into account, the all-SiC system is still unmatched when strictly performance and maximization of efficiency are considered [19].…”

Section: Introductionmentioning

confidence: 99%

All-SiC ANPC Submodule for an Advanced 1.5 kV EV Charging System under Various Modulation Methods

et al. 2021

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This work is focused on the design and experimental validation of the all-SiC active neutral-point clamped (ANPC) submodule for an advanced electric vehicle (EV) charging station. The topology of the station is based on a three-wire bipolar DC bus (±750 V) connecting an ac grid converter, isolated DC-DC converters, and a non-isolated DC-DC converter with a battery energy storage. Thus, in all types of power converters, the same three-level submodule may be applied. In this paper, a submodule rated at 1/3 of the nominal power of the grid converter (20 kVA) is discussed. In particular, four different modulation strategies for the 1.5 kV ANPC submodule, exclusively employing fast silicon carbide (SiC) MOSFETs, are considered, and their impact on the submodule performance is analyzed. Moreover, the simulation study is included. Finally, the laboratory prototype is described and experimentally verified at a switching frequency of 64 kHz. It is shown that the system can operate with all of the modulations, while techniques PWM2 and PWM3 emerge as the most efficient, and alternating between them, depending on the load, should be considered to maximize the efficiency. Furthermore, the results showcase that the impact of the different PWM techniques on switching oscillations, including overvoltages, can be nearly fully omitted for a parasitic inductance optimized circuit, and the choice of modulation should be based on power loss and/or other factors.

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“…These multilevel topologies allow the output voltage to be closer to the sinusoidal wave by increasing the number of voltage levels, and reducing the harmonic distortion, as reported in the literature [2][3][4]. The major multilevel topologies that have been studied are neutral point clamped (NPC) [5,6], active net point clamped (ANPC) [7][8][9], flying capacitor (FC) [10][11][12], and cascaded multilevel inverter (CMLI) [13,14]. The ANPC application has a high cost since it has a relatively large number of switching devices.…”

Section: Introductionmentioning

confidence: 99%

A Novel Zero Dead-Time PWM Method to Improve the Current Distortion of a Three-Level NPC Inverter

et al. 2020

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This paper proposes a novel pulse width modulation (PWM) for a three-level neutral point clamped (NPC) voltage source inverter (VSI). When the conventional PWM method is used in three-level NPC VSI, dead time is required to prevent a short circuit caused by the operation of complementary devices on the upper and lower arms. However, current distortion is increased because of the dead time and it can also cause a voltage unbalance in the dc-link. To solve this problem, we propose a zero dead-time width modulation (ZDPWM) which does not require dead time used in complementary operation. The proposed technique applies the offset voltage to the space vector pulse width modulation (SVPWM) reference voltage for the same modulation index (MI) as the conventional SVPWM, but any complementary switching operation needs dead time. In addition, the proposed method is divided into four operation sections using the reference voltage and phase current to operate switching devices which flow the current depending on the section. This ZDPWM method is simply implemented by carrier and reference voltage that reduce the current distortion, because complementary operation that needs dead time is not implemented. However, the operation section is delayed due to the sampling delay that occurs during the experiment. Therefore, in this paper, we conduct a modeling of sampling delay to improve the delay of operation section. To verify the principle and feasibility of the proposed ZDPWM method, a simulation and experiment are implemented.

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

Cited by 28 publications

References 17 publications

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

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

All-SiC ANPC Submodule for an Advanced 1.5 kV EV Charging System under Various Modulation Methods

A Novel Zero Dead-Time PWM Method to Improve the Current Distortion of a Three-Level NPC Inverter

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