Submodule power balancing control of modular multilevel converters under capacitor degradation

For the single-phase high-power railway traction system, the inevitable second-order resonating power has become a critical issue to the traction system. In this paper, a power decoupling solution is proposed to replace the conventional passive LC resonance filter by utilizing the buck-type bidirectional DC/DC converter (BBDC) of Hybrid Electric Multiple Units (HEMU), which is designed to power the train in non-electrified routes using the on-board battery. By considering both the current ripples in the battery mode and the power decoupling in the catenary mode, the corresponding parameter design process of the BBDC is presented. Based on the power coupling phenomenon and the spectrum characteristic of the BBDC, a direct resonance control method is proposed to decouple the low-order resonating power. Simulations and experiments are carried out to validate the effectiveness of the new proposal. The results demonstrate that the proposal is almost the same as using the conventional passive LC resonance filter for power decoupling in both steady and dynamic operation scenarios. 1

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“…2). Based on ( 5) and (7), there are A2k=•••= A6=A4=0 and 2ωLcs=1/(2ωCcs). Thus, ics can be expressed as ( )…”

Section: B Power Coupling Feature Of the Bbdcmentioning

confidence: 99%

“…However, this hardware solution occupies large volume and heavy weight. Moreover, the capacitor also inevitably suffers from its aging issue, which will worsen the performance over time [7], [8]. Hence, a software-based solution of suppressing the second-order voltage fluctuation is valuable for practical applications.…”

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confidence: 99%

Resonating Power Decoupling Using Multifunctional Bidirectional DC/DC Converter in Hybrid Railway Traction Application

Shen

Chen

Jin

et al. 2022

IEEE Trans. Power Electron.

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“…Thereby, the fluctuating power is absorbed, and the DC-link voltage can be smooth without the low-frequency component [4]. However, the hardware solution using the LC resonant filter is of low power density and low reliability [5,6]. Therefore, more efforts have been made on the software solutions to remove the bulky LC resonant filter.…”

Section: Introductionmentioning

confidence: 99%

Beat‐less algorithm based on dual‐frequency compensation in railway traction applications

Shen

Chen

Kuang³

et al. 2021

IET Power Electronics

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The beat phenomenon can be a critical issue in railway traction applications. This paper proposes a dual-frequency compensation (DFC) method for the beat-less algorithm to shift the spectrum of the beat voltages to a higher-frequency region. Two variables for frequency compensation are derived by mathematical calculations based on the singlefrequency compensation (SFC) method. The applicability and superiority of the DFC method are analyzed. It is proposed that the DFC method can be a transition between the modulation index compensation (MIC) method and the SFC method, so the beat phenomenon can be greatly suppressed in the full speed range. The implementation of the DFC method is proposed to guide how to generate the two variables. The experimental verification is carried out on the StarSim hardware-in-loop platform, and the results demonstrate that the DFC method is more effective compared with the SFC method for beat phenomenon suppression. It also shows the modulation index with the DFC method is higher than that with the MIC method.

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A Modified MPPT-based Model Predictive Control for a Single-stage Modular Multilevel Converter in Grid-connected Photovoltaic Applications

Akbari

Shadlu

2023

2023 14th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

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Submodule power balancing control of modular multilevel converters under capacitor degradation

Cited by 4 publications

References 44 publications

Resonating Power Decoupling Using Multifunctional Bidirectional DC/DC Converter in Hybrid Railway Traction Application

Resonating Power Decoupling Using Multifunctional Bidirectional DC/DC Converter in Hybrid Railway Traction Application

Beat‐less algorithm based on dual‐frequency compensation in railway traction applications

A Modified MPPT-based Model Predictive Control for a Single-stage Modular Multilevel Converter in Grid-connected Photovoltaic Applications

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