Elimination of zero sequence circulating current between parallel operating three-level inverters

Li, Kai; Wang, Xiaodong; Dong, Zhenhua; Wang, Xianzhi; Guerrero, Josep M.; Vasquez, Juan C.; Wang, Qingsong

doi:10.1109/iecon.2016.7793891

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…Based on the current sharing and NPP balance control proposed in this paper, PI control of ZSCC [36] and the proposed method are used to verify the effect of the circulating current suppression, respectively. The following are three cases of parameter mismatch for two parallel‐connected inverters.…”

Section: Experimental Verificationmentioning

confidence: 99%

Stability analysis and duty cycle limitation of grid‐connected current control strategy for multiple parallel three‐level T‐type grid‐connected inverters

Liu

Sun

Ren

et al. 2020

IET power electron.

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Multiple parallel three‐level T‐type inverters (3LT2Is) have become the trend in large‐power low‐voltage applications. In parallel operation of modular 3LT2Is, three aspects including current sharing control, circulating current suppression and neutral‐point potential (NPP) balance control should be considered. In this study, a grid‐connected current control strategy with the ability to independently adjust three control objectives is proposed for the multiple parallel three‐level T‐type grid‐connected inverters. The duty cycle limitation among current sharing, NPP balancing and circulating current and their influence are analysed in detail. The stability analysis of multi‐paralleled inverters on the basis of the single‐phase equivalent circuit is carried out considering the influence of circulating current. Experimental results prove the validity of the proposed control strategy.

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Section: Experimental Verificationmentioning

confidence: 99%

Stability analysis and duty cycle limitation of grid‐connected current control strategy for multiple parallel three‐level T‐type grid‐connected inverters

Liu

Sun

Ren

et al. 2020

IET power electron.

View full text Add to dashboard Cite

show abstract

“…Besides, all the methods mentioned above are mainly focused on two‐level inverters. In [25], an improved zero common‐mode voltage PWM (ZCMV‐PWM) technique and ZSCC feedback control method is presented to suppress the ZSCC between parallel operating 3LT 2 Is. However, the additional electric circuit used for the neutral point potentials (NPPs) balance control increases the cost and size.…”

Section: Introductionmentioning

confidence: 99%

Elimination of zero sequence circulating currents in paralleled three‐level T‐type inverters with a model predictive control strategy

Wang

Zou

Ying

et al. 2018

IET Power Electronics

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The configuration of modular paralleled three-level T-type inverters (3LT 2 Is) has been widely utilised to extend the system power rating. However, zero sequence circulating currents (ZSCCs) are generated when sharing the common DC-link and the AC side without isolated transformers. This study presents a novel model predictive control (MPC) based strategy to eliminate the ZSCC in parallel operating 3LT 2 Is. Both the differences of common-mode voltages (CMVs) and neutral point potentials (NPPs) between paralleled 3LT 2 Is are investigated to be the potential exciting sources of the ZSCC based on the developed model of the ZSCC. According to this conclusion, an MPC-based zero CMV method which adds an additional term to the cost function is used to reduce the differences of CMVs between paralleled 3LT 2 Is. Besides, a closed-loop ZSCC feedback control method is further introduced to compensate the ZSCC by modifying the cost function. With the proposed MPC-based ZSCC elimination strategy, the ZSCC between the paralleled 3LT 2 Is can be effectively eliminated in both steady and dynamic states. Besides, good performances can be achieved for both load current tracking and NPP balance control. Simulation and experimental results validate the effectiveness of the proposed ZSCC elimination strategy.

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Analysis of Circulating Harmonic Currents in Paralleled Three Level ANPC Inverters using SVM

Niu

Chen

Zhang

et al. 2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Elimination of zero sequence circulating current between parallel operating three-level inverters

Cited by 11 publications

References 19 publications

Stability analysis and duty cycle limitation of grid‐connected current control strategy for multiple parallel three‐level T‐type grid‐connected inverters

Stability analysis and duty cycle limitation of grid‐connected current control strategy for multiple parallel three‐level T‐type grid‐connected inverters

Elimination of zero sequence circulating currents in paralleled three‐level T‐type inverters with a model predictive control strategy

Analysis of Circulating Harmonic Currents in Paralleled Three Level ANPC Inverters using SVM

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