Optimal Overlap-Time Distribution of Space Vector Modulation for Current-Source Rectifier

Liu, Pengcheng; Wang, Zheng; Xu, Yan; Xiao, Huafeng; Li, Yunwei

doi:10.1109/tie.2020.2989714

Cited by 21 publications

(5 citation statements)

References 22 publications

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“…In addition, to maintain the continuity of the DC link current, the overlap-time has to be introduced between two switching signals during commutation (Suroso and Noguchi, 2020;Liu et al, 2021). To guarantee the commutation of the low-speed switches is completed, the delay of switching pulses caused by the overlaptime cannot be ignored as well.…”

Section: Frontiers In Energy Researchmentioning

confidence: 99%

A strategy for improving the SHEPWM commutation speed of CSI through hybrid switches

Wang

Xia²,

Rui³

et al. 2023

Front. Energy Res.

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High-power current source inverters (CSI) usually operate at a low switching frequency to reduce switching loss. To suppress low-order harmonics and simplify filter design, the selective harmonic elimination pulse width modulation (SHEPWM) technique is a feasible common modulation strategy in industrial applications. This paper proposes an operational strategy that uses an H7 current source inverter (H7-CSI) with hybrid switches to perform the SHEPWM technique. On the basis of retaining the conventional H6 inverter bridge, the commutation speed of the CSI is improved by an additional shunt-connected high-performance power switch. The proposed scheme solves the problem that the CSIs built with low-speed switches (such as GTOs) may have difficulty for implementing the setting pulse widths of null states, while further reducing the switching losses at an acceptable cost. In addition, mitigating the influence of overlap-time by optimizing the driving signal of the H6 converter bridge. Finally, simulation and experiments have verified the effectiveness of the proposed CSI scheme.

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Section: Frontiers In Energy Researchmentioning

confidence: 99%

A strategy for improving the SHEPWM commutation speed of CSI through hybrid switches

Wang

Xia²,

Rui³

et al. 2023

Front. Energy Res.

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“…In (19), D epv means the duty error of the voltage source inverter due to the gate oxide degradation when the pole current is positive. D env also represents the duty error of the voltage source inverter due to the gate oxide degradation when the pole current is negative.…”

Section: Performance Variation Of Grid-connected Voltage Source Inver...mentioning

confidence: 99%

“…These duty errors change the output quality of the voltage source converter. Furthermore, an overlap time is required in the current source converter to prevent an overvoltage of the DC link inductor from occurring when all upper or lower switches are turned off simultaneously [19]. Like the voltage source converter, the overlap time, T don , and T doff generate the duty errors in the current vector, resulting in changes in the output quality of the current source converter.…”

Section: Introductionmentioning

confidence: 99%

Impacts of SiC-MOSFET Gate Oxide Degradation on Three-Phase Voltage and Current Source Inverters

2022

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In this paper, the performance variations of SiC MOSFET-based voltage and current source inverters under gate oxide degradation are studied. It is confirmed that the turn-on and turn-off delays of SiC MOSFETs change significantly by high electric field stress, which accelerates the gate oxide degradation. Variations in the turn-on and turn-off delays of switching devices extend or reduce the duty error of voltage source inverters and current source inverters. The performance variations of the voltage and current source inverter due to the duty error changes caused by the gate oxide degradation are analyzed through simulations. As a result, the gate oxide degradation worsens the performance of the voltage source inverter. Furthermore, the negative gate oxide degradation, which lowers the threshold voltage, decreases the performance of the current source inverter.

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“…Among offline methods, selective harmonics elimination/selective harmonics compensation (SHE/SHC) pulse width modulation (PWM) [10][11][12][13] is often used for mediumvoltage high-power applications; this method does not require a fast dynamic response and has a low switching frequency to reduce switching losses. The sinusoidal PWM 14,15 , space vector PWM [16][17][18] , and carrier-based PWM 19,20 are online methods. A typical CSR is a six-switch rectifier, as illustrated in Figure 1, in which unidirectional switches can be im- plemented with reverse blocking IGBTs (RB-IGBTs) or diodes in series with MOSFETs or IGBTs.…”

Section: Introductionmentioning

confidence: 99%

Variable Pulse Density Modulation for a Buck-Type Three-Switch Current Source Rectifier

Ngo-,

Nguyen,

Nguyen-

2023

Sci. Tech. Dev. J.

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With flexible voltage adjustment without an intermediate DC/DC converter, short-circuit protection, self-starting, high reliability, and three-phase current source rectifiers (CSRs) are being widely used in high-power medium-voltage applications and low-power low-voltage applications. Modulation methods significantly affect the performance of CSRs and can be categorized into offline modulation methods, such as selective harmonic elimination/compensation pulse width modulation (SHE/SHC-PWM), and online modulation methods, such as space vector pulse width modulation (SV-PWM) and carrier-based pulse width modulation (CB-PWM). The SHE/SHC-PWM is popular in high-power medium-voltage applications that do not require a fast dynamic response and have a low switching frequency. Online modulations considerably improve the dynamic response and performance of the CSR; however, high computational power, such as digital signal processors (DSPs), is required at higher switching frequencies, leading to greater system complexity and cost. In this paper, an offline method based on variable pulse density modulation (VPDM) of power switches to synthesize sinusoidal input currents and control power transfer with pulse width modulation (PWM) is proposed. The proposed modulation is applicable to the three-switch buck-type VIENNA rectifier, showing the capability of improving the input current total harmonic distortion (THD) with respect to the SHE-PWM and is comparable to online modulations at a sufficiently high switching frequency. The simulation and experimental results basically prove the feasibility of the proposed modulation.

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Optimal Overlap-Time Distribution of Space Vector Modulation for Current-Source Rectifier

Cited by 21 publications

References 22 publications

A strategy for improving the SHEPWM commutation speed of CSI through hybrid switches

A strategy for improving the SHEPWM commutation speed of CSI through hybrid switches

Impacts of SiC-MOSFET Gate Oxide Degradation on Three-Phase Voltage and Current Source Inverters

Variable Pulse Density Modulation for a Buck-Type Three-Switch Current Source Rectifier

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