Generalized Sensorless Capacitor Voltage Balancing technique for Modular Multilevel Converter with increased output voltage levels

Gobburi, Hari Babu; Borghate, Vijay B.; Meshram, P. M.

doi:10.1109/pesgre45664.2020.9070556

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…To generate the PWM pulses for N HBSMs conventionally, the triangular carrier of each SM and modulating signal are compared. 13,15,17,18 The proposed approach compares the PWM reference with the SM numbers in the range of 1 to N.…”

Section: Generation Of Pwm Pulsesmentioning

confidence: 99%

“…12 Therefore, the carrier based high-switching frequency methods such as phase disposition PWM (PDPWM) and phase-shifted carrier PWM (PSCPWM) are the alternative and widely applied on MMCs. [13][14][15][16][17][18] The PDPWM has better harmonic performance but suffers from uneven power distribution. 19 This is solved by sorting the capacitors and generated 2N + 1 levels.…”

Section: Introductionmentioning

confidence: 99%

“…However, the reduced switching frequency methods demand the large size capacitors to minimize the capacitor voltage fluctuations 12 . Therefore, the carrier based high‐switching frequency methods such as phase disposition PWM (PDPWM) and phase‐shifted carrier PWM (PSCPWM) are the alternative and widely applied on MMCs 13–18 …”

Section: Introductionmentioning

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: Generation Of Pwm Pulsesmentioning

confidence: 99%

Section: Introductionmentioning

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

Self Cite

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show abstract

“…Hence, the cost may increase with the huge number of SMs. The SM patterns are exchanged among the SMs to ensure the sensorless capacitor voltage balancing 36–38 . But, the carrier requirement increases with the increase in SM count.…”

Section: Introductionmentioning

confidence: 99%

“…The SM patterns are exchanged among the SMs to ensure the sensorless capacitor voltage balancing. [36][37][38] But, the carrier requirement increases with the increase in SM count. A matrix modulation method is presented in Liu and Peng.…”

Section: Introductionmentioning

confidence: 99%

Sensorless voltage balancing method for modular multilevel converter

Gobburi

Borghate

Meshram

2022

Circuit Theory & Apps

Self Cite

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Modular multilevel converters (MMCs) have become prominent for high and medium power applications. The phase-disposition pulse width modulation (PDPWM) technique is a carrier-based method that generates good quality output. However, it has the inherent problem of uneven power distribution. Conventionally, this is solved by expensive voltage and current measurements. In this paper, a capacitor voltage balancing method is presented for MMC, which eliminates the need for voltage and current sensors. It also ensures uniform power distribution among the submodules (SMs). In addition, it needs only one carrier per phase, and one PWM reference, for either upper arm or lower arm to produce N + 1 level with N SMs per arm. The capacitor voltage balancing method is analyzed mathematically and verified for the MMC with two-level half-bridge SMs. The same method is also extended to the MMC with three-level flying capacitor SMs. MATLAB/SIMULINK simulations and experimental results on a laboratory prototype are presented to verify the theoretical concepts. K E Y W O R D Smodular multilevel converter (MMC), sensorless voltage balancing, single-carrier PWM, three-level flying capacitor submodule (3L-FCSM)

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Voltage Balancing method for Modular Multilevel Converter with Sensorless Operation

Gobburi¹,

Borghate²,

Meshram³

2022

2022 IEEE IAS Global Conference on Emerging Technologies (GlobConET)

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Generalized Sensorless Capacitor Voltage Balancing technique for Modular Multilevel Converter with increased output voltage levels

Cited by 5 publications

References 12 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

Sensorless voltage balancing method for modular multilevel converter

Voltage Balancing method for Modular Multilevel Converter with Sensorless Operation

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