± 180° Discontinuous PWM for Single-Phase PWM Converter of High-Speed Railway Propulsion System

Song, Min-Sup; Cho, Inho; Lee, Jae-Bum

doi:10.3390/en13071550

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…As shown in the power switch technology scaling illustration in Figure 7, the insulated-gate bipolar transistor (IGBT) is the most suitable switch type for our application. A single-phase inverter in the H-bridge topology consists of four IGBT switching devices, as shown in Figure 8 [13]. When switches S1, S3 and S2, S4 are alternately switched on and off at a frequency of fs, an alternating voltage waveform is produced across the drive coils in the launcher.…”

Section: Power Stagementioning

confidence: 99%

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Design and Implementation of a Linear Induction Launcher with a New Excitation System Utilizing Multi-Stage Inverters

Dogangunes,

Balikci

2024

Energies

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Linear induction launchers (LILs) are a specific subtype of linear motors. However, LILs are air-core machines that consistently operate in a transient rather than a steady state. Moreover, their operating currents and voltages exceed those of traditional machines. The execution time of LILs often remains within a few milliseconds, and it is essential to manage extremely high-power levels quickly. The control methods for LILs differ from those used for regular machines due to the differences from conventional linear motors. In this respect, there are still challenges to be overcome in power systems designed for LILs in the literature. This study has developed a novel power energization system to address these challenges, particularly in terms of inadequate V/f control and the unnecessary energization of regions along the barrel where no projectile is present. It focuses on the system’s design using multi-stage H-bridge inverters to produce a sinusoidal current for section-by-section polyphase excitation. An FPGA-based electronics control system generates bipolar PWM fiber-optical signals for IGBT switches for scalar V/f control of the inverters. Distributed multi-inverters power each stage of the launcher’s barrel and are controlled by the FPGA to create the travelling electromagnetic wave package. Three-dimensional FEM analysis is used for observation of the trigger timing to ensure positive force along the barrel. By driving each inverter independently, the coils on the barrel are excited sequentially based on the position of the projectile. This study also explains the implementation of a laboratory-scale barrel prototype, a 40 mm aluminum projectile, its power electronics, and the control part of the multi-stage inverters. In this study, 3300 V–1200 A IGBTs and 8.8 mF–2000 V DC-Link capacitors were used in the H-bridge inverter modules. Experimental studies have been conducted on the launcher, and the results obtained, including achieving a velocity of 30 m/s, are consistent with the electromagnetic simulations. It has been observed that the launcher, powered by the proposed system, is approximately 57.14% more efficient compared to the version energized by a single inverter.

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Section: Power Stagementioning

confidence: 99%

“…A single-phase inverter in the H-bridge topology consists of four IGBT switching devices, as shown in Figure 8 [13]. When switches S1, S3 and S2, S4 are alternately switched on and off at a frequency of fs, an alternating voltage waveform is produced across the drive coils in the launcher.…”

Section: Power Stagementioning

confidence: 99%

Design and Implementation of a Linear Induction Launcher with a New Excitation System Utilizing Multi-Stage Inverters

Dogangunes,

Balikci

2024

Energies

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“…Here, E is the unit voltage level of the capacitor and means one third of the DC-link voltage Vdc. In MNRV DPWM, a ±180º clamped switching state is introduced to reduce switching loss and redundancy [39]. When Vcmd > 0, in UCM, VCMD_A is clamped to a Vdc value and VCMD_B is classified to LVR or SVR according to the magnitude of VCMD_B, and in LCM, VCMD_B is clamped to 0 value and VCMD_A is divided to LVR or SVR depending to the magnitude of VCMD_A.…”

Section: B Design Principles Of Fb Mnrv Dpwmmentioning

confidence: 99%

Full-Bridge Diode-Clamped Four-Level Symmetric Switching Converter

Song,

Kim,

Lee

2023

IEEE Access

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In this paper, we propose a novel full-bridge (FB) diode-clamped four-level symmetric switching converter. Multi-neighboring reference vector discontinuous PWM (MNRV DPWM) for FB topology was implemented through symmetric half-bridge (HB)-based control using an offset voltage addition method. A diode-clamped four-level symmetrical switching circuit with pulse-amplitude modulation (PAM) was proposed and its working principle was explained in detail. Voltage gain, duty loss factor, and zero-voltage-switching (ZVS) condition were derived by analyzing the steady-state operating characteristics of the proposed converter. The required input and output capacitance values were also calculated explicitly. The voltages across the series-connected input DC-link capacitors were well balanced and the output voltage was controlled in a simple linear manner by PAM. The proposed method has the advantage of reducing circulating current compared to the existing phase-shift method because there is an additional powering period. The effectiveness of the proposed converter was verified through simulation and prototype experiments. The power conversion efficiency exceeded 91.44% at an output power (PO) of 250W or higher, with a peak efficiency of 95.23% achieved at PO=750W.

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Pulse-Amplitude-Modulation Full-Bridge Diode-Clamped Multilevel LLC Resonant Converter Using Multi-Neighboring Reference Vector Discontinuous PWM

Song

Lee

2022

Energies

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A full-bridge diode-clamped multilevel LLC resonant converter suitable for power conversion systems that use high input voltage, such as railway vehicles, is proposed in this paper. In order to eliminate the voltage deviations of the capacitors connected in series to the high voltage input DC link, a novel modulation strategy referred to as multi-neighboring reference vector discontinuous pulse-width modulation (MNRV DPWM) is proposed. Unlike the existing two-level resonant converter that varies the operating frequency to hold the output voltage constant, the proposed multilevel resonant converter modulates the amplitude of the fundamental wave input to a resonance tank while fixing the operating frequency at the resonance point. Therefore, the design of passive elements becomes easier, and stable operation is possible over a wide operating range with only one power conversion stage. In this paper, the control algorithm and operation characteristics of the newly proposed full-bridge diode-clamped four-level LLC resonant converter are analyzed in detail and design guidelines are presented. The feasibility of the proposed converter is verified through a simulation and an experiment with a prototype converter.

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± 180° Discontinuous PWM for Single-Phase PWM Converter of High-Speed Railway Propulsion System

Cited by 3 publications

References 23 publications

Design and Implementation of a Linear Induction Launcher with a New Excitation System Utilizing Multi-Stage Inverters

Design and Implementation of a Linear Induction Launcher with a New Excitation System Utilizing Multi-Stage Inverters

Full-Bridge Diode-Clamped Four-Level Symmetric Switching Converter

Pulse-Amplitude-Modulation Full-Bridge Diode-Clamped Multilevel LLC Resonant Converter Using Multi-Neighboring Reference Vector Discontinuous PWM

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