Active Power Decoupling for a Modified Modular Multilevel Converter to Decrease Submodule Capacitor Voltage Ripples and Power Losses

Jia, Guanlong; Chen, Min; Tang, Song; Zhang, Chenghao; Zhu, Guannan

doi:10.1109/tpel.2020.3016493

Cited by 40 publications

(13 citation statements)

References 32 publications

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“…In simulations, the maximum voltage of the decoupling capacitor is 1574 V shown in Fig 8(c), which is nearly consistent with (25). Because the switching ripples are not considered in (24), the maximum current of the decoupling capacitor in Fig 8(c) (495 A) is much higher, which is still lower than that in battery mode (418 A + 100 A). The results show that the BBDC designed for the battery mode still can be applied to the power decoupling mode.…”

Section: Discussionsupporting

confidence: 63%

See 1 more Smart Citation

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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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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Section: Discussionsupporting

confidence: 63%

“…( 26) and (27) show that the heating loss of the filter inductor Lcs and IGBT bridge-arm in power decoupling mode is smaller than that in battery mode. (24) and (27) indicate that the maximum current in power decoupling mode still meets the requirements designed for battery mode.…”

Section: ) Current and Voltage Stress Analysismentioning

confidence: 96%

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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“…Despite the reduction of SM voltage ripples, it requires twice the number of IGBTs and capacitors compared to the conventional MMC. The work [20] proposes a modified MMC with an (APF) that connects this filter between the last SM in the upper arm and the first SM in the lower arm to divert the power ripples into the capacitor of the APF. However, this modified topology also increases the number of IGBTs and capacitors.…”

Section: Issn: 2088-8694 mentioning

confidence: 99%

“…The upper and the lower arm energy are obtained by integrating (19) and (20). When it comes to VSD application, the term 𝑚/𝜔 is constant, therefore the third term on the right-hand side of ( 21) and ( 22) is constant.…”

Section: During Low-speed Constant Torque Operationmentioning

confidence: 99%

A modified CPS-PWM for capacitor voltage reduction of MMC based variable speed drive

Bashir

Zidan

Memon

2022

IJPEDS

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<span>In recent years, modular multilevel converters (MMC) have become one of the most popular multilevel converter topologies. Despite its growing popularity, MMC is still less widespread in variable speed drives (VSDs) applications. The reason for this is that the voltage ripple of the MMC submodules (SM) increases during the low-speed constant torque operation. In this paper, carrier phase shift-pulse width modulation (CPS-PWM) is modified to reduce the average voltage of SM and thus accommodate more ripples without exceeding the maximum SM voltage. The proposed method does not involve the injection of circulating current components, thereby resulting in less power loss. In addition to that, the necessity for increasing the SM capacitor rating during low-speed operation is not required. Extensive simulation has been conducted under various speed commands to validate the effectiveness of this method.</span>

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“…The current SM capacitor ripple analysis of the MMC mainly focuses on the typical MMC topology [23][24][25][26][27][28][29][30][31], and focuses on analysing the SM capacitor voltage ripple and its low frequency ripple suppression. There are few analyses on the capacitor ripple of SMs connected to PV panels or other distributed generators.…”

Section: Introductionmentioning

confidence: 99%

Unbalanced power control of a modular multilevel converter with photovoltaic resources and the capacitor voltage ripple analysis

Liu

Zhang

Wang

et al. 2022

IET Power Electronics

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The modular multilevel photovoltaic (PV) converter can achieve independent power control and help to increase the efficiency of the system. However, the output power among PV modules is unbalanced, which will result in the power loss of system if not properly controlled. This paper first introduces a power control scheme to adjust the power distribution among dc grid, ac grid and PV modules, and presents the mathematical bases of the scheme and the unbalanced power control of the strategy. However, the voltage ripple of MMC sub module (SM) capacitor is also an important parameter. In this system, the SM voltage ripple has not been analysed in relevant articles. Because there are many variables, it is not easy to analyse. Here, the voltage ripple law of the SM capacitor is analysed, by simplifying variables and presenting a fast analytical method, which has reference significance for the selection of SM capacitor. Matlab simulation and the hardware in the loop simulation experiment built by StarSim of Modelling Tech verify the effectiveness of the introduced control strategy and the correctness of the SM capacitor ripple analysis.

show abstract

Active Power Decoupling for a Modified Modular Multilevel Converter to Decrease Submodule Capacitor Voltage Ripples and Power Losses

Cited by 40 publications

References 32 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

A modified CPS-PWM for capacitor voltage reduction of MMC based variable speed drive

Unbalanced power control of a modular multilevel converter with photovoltaic resources and the capacitor voltage ripple analysis

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