A Decoupled Circulating Current Suppressing Strategy For Modular Multilevel Converter

Mao, Shukai; Li, Binbin; Zhang, Shuxin; Xu, Dianguo; Ji-zhong, Chen; Wang, Xiaoqing

doi:10.1109/spec.2018.8636081

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…Further, the RMS current magnitudes of circulating current are calculated from the harmonic spectrums shown in Figure 18A and B. Also, the actual capacitor sizing required for a voltage ripple of 6 V is calculated as per Mao et al 30 Considering the second harmonic component of circulating current in Figure 18B, the inductor size is calculated as given by Qingrui et al 31 All these parameters are compared with and without current control and tabulated in Table 4 . It is observed that enabling of control technique helps in reducing the sizing of capacitor and arm inductor.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…It is well‐known that simultaneous insertion or bypass of one SM from upper and lower arm will not have any influence on the output voltage as given by Equation (2). But, it will have an impact on circulating current 30 . Therefore, one SM from upper and lower arm is inserted during N − 1 insertion and bypassed during N + 1 insertion.…”

Section: Proposed Voltage Balance Control Methodsmentioning

confidence: 99%

“…But, it will have an impact on circulating current. 30 Therefore, one SM from upper and lower arm is inserted during N 1 insertion and bypassed during N + 1 insertion. With this, the total insertion of SMs and arm inductor drop are modified as shown in Figure 11A and B, respectively.…”

Section: Circulating Current Analysismentioning

confidence: 99%

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A level enhanced voltage balancing method for modular multilevel converter without using sensors

Gobburi

Borghate

Meshram

2022

Circuit Theory & Apps

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The intrinsic characteristics such as modular structure, filterless operation, and absence of DC-link capacitor have made the modular multilevel converter (MMC) superior to the conventional multilevel converters. However, the submodule (SM) capacitor voltage balancing is crucial. This paper presents a voltage balance control method for MMC. The proposed method generates 2N + 1 levels (where N is the number of SMs per arm) which halves the step size of output voltage and improves the harmonic performance as compared to N + 1 level generation. It requires only one carrier per phase and no voltage and current measurements are needed for the implementation. Therefore, the proposed method makes the system cost-effective and reduces the implementation issues related with carrier-based methods substantially. It also alleviates the non-uniform charge distribution problem with the phase disposition pulse width modulation (PDPWM) technique. Further, a detailed mathematical analysis is presented which enhances the understanding of balancing algorithm. In addition to this, the circulating current with 2N + 1 modulation is analyzed and a control technique is presented. The proposed voltage balancing method is simulated comprehensively in MATLAB/SIMULINK software and validated by the experimental results obtained from a laboratory prototype.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Proposed Voltage Balance Control Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A level enhanced voltage balancing method for modular multilevel converter without using sensors

Gobburi

Borghate

Meshram

2022

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…VSC-HVDC is widely used in island systems, wind farm grid connections [1] , and large-scale urban power supplies. As an important part of the flexible DC system, the modular MMC has the advantages of a strong fault protection ability, scalability, low output voltage ripple characteristics, high efficiency, and high modularity, and is widely used in the VSC-HVDC [2] .…”

Section: Introductionmentioning

confidence: 99%

Control Strategy of Circulating Current Suppression for Modular Multilevel Converter

Wang,

Zheng,

Zhong

et al. 2023

J. Phys.: Conf. Ser.

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The structural characteristics of modular multilevel converters (MMC) lead to circulating current problems, which increases the requirements for device capacity and withstand voltage levels. Therefore, this paper proposes a circulating current suppression strategy based on new sliding mode control. This strategy uses a variable approach rate to reduce chattering caused by sliding mode control. Compared with the circulating current suppression strategy using traditional PI control, it enhances the anti-interference of the circulating current suppression strategy. Finally, this paper builds the MATLAB/Simulink simulation model and experimental platform. The results show that the strategy has good anti-interference performance.

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A Decoupled Circulating Current Suppressing Strategy For Modular Multilevel Converter

Cited by 2 publications

References 11 publications

A level enhanced voltage balancing method for modular multilevel converter without using sensors

A level enhanced voltage balancing method for modular multilevel converter without using sensors

Control Strategy of Circulating Current Suppression for Modular Multilevel Converter

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