A carrier-based PWM scheme for neutral-point voltage balancing in three-level inverters

Tallam, R.M.; Naik, R.; Nondahl, Thomas A.

doi:10.1109/apec.2004.1296090

Cited by 51 publications

(55 citation statements)

References 10 publications

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“…Numerous studies about the CB-PWM strategy for the three-level NPC VSI have been published [12], which assists to understand the proposed method in this paper. (2) locates the non-zero voltage vectors in the center of a sampling period [14]- [16].…”

Section: Conventional Cb-pwm Strategymentioning

confidence: 99%

“…They could be mainly classified into carrier-based pulsewidth modulation (CB-PWM) [11][12][13][14][15][16][17][18], space vector modulation (SVM) [19][20][21][22][23][24][25][26], and selective harmonic elimination (SHE) [27][28][29][30]. Among these PWM strategies, the CB-PWM has probably been the most popular due to its simplicity of implementation, which based on the comparison between the modulation reference signals and two triangular carriers.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with SPWM, the non-sinusoidal CB-PWM strategies can extend the linear modulation ranges make it possible to increase the fundamental of the output voltages. Reference [12] presented the CB-PWM strategies, which are essentially two modulation modes (unipolar mode and dipolar mode). The application of both modulation modes to three-level NPC VSI has been equated output voltages.…”

Section: Introductionmentioning

confidence: 99%

“…In recent year, several modulation strategies for a threelevel NPC VSI have been developed [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. They could be mainly classified into carrier-based pulsewidth modulation (CB-PWM) [11][12][13][14][15][16][17][18], space vector modulation (SVM) [19][20][21][22][23][24][25][26], and selective harmonic elimination (SHE) [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Modified Unipolar Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source Inverters

Srirattanawichaikul¹,

Premrudeepreechacharn²,

Kumsuwan³

2014

Journal of Electrical Engineering and Technology

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-This paper presents a simple modified unipolar carrier-based pulsewidth modulation (CB-PWM) strategy for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). Analytical expressions for the relationship between modulation reference signals and output voltages are derived. The proposed modulation technique for the three-level NPC VSI includes the maximum and minimum of the three-phase sinusoidal reference voltages with zero-sequence voltage injection concept. The proposed modified CB-PWM strategy incorporates a novel method that requires only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. It has the advantages of being simplifying the algorithm with no need of complex two/multi-carrier pulsewidth modulation or space vector modulation (SVM) and it's also simple to implement. The possibility of the proposed CB-PWM technique has been verified though computer simulation and experimental results.

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Section: Conventional Cb-pwm Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modified Unipolar Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source Inverters

Srirattanawichaikul¹,

Premrudeepreechacharn²,

Kumsuwan³

2014

Journal of Electrical Engineering and Technology

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“…The work on [10] proved that the switching pulses for the inverter can be generated by using dilated and shifted versions of synthesis scaling function ( , ) …”

Section: Table I Operation States Of the Single-phase Three-level Invmentioning

confidence: 99%

Wavelet PWM Technique for Single-Phase Three-Level Inverters

Zheng¹,

Zhang²,

Qiu³

et al. 2015

Journal of Power Electronics

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The wavelet PWM (WPWM) technique has been applied in two-level inverters successfully, but directly applying the WPWM technique to three-level inverters is impossible. This paper proposes a WPWM technique suitable for a single-phase three-level inverter. The work analyzes the control strategy with the WPWM and obtains the design of its parameters. Compared with the SPWM technique for a single-phase three-level inverter under the same conditions, the WPWM can obtain high magnitudes of the output fundamental frequency component, low total harmonic distortion, and simpler digital implementation. The feasibility experiment is given to verify of the proposed WPWM technique.

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A hybrid discontinuous PWM algorithm of balancing neutral point voltage for 3L‐NPC inverter

Zhong

2021

Circuit Theory & Apps

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Wider linear modulation range, less switching loss, and simplicity are the goals pursued by various modulation methods of multilevel inverters. This paper proposes a new hybrid discontinuous pulsewidth modulation (HDPWM) strategy for three-level neutral-point-clamped (3L-NPC) inverter that can achieve the above goals to a certain extent. According to the position of the reference voltage vector and the actual situation of the neutral point voltage, different control modes and clamping types are selected. The neutral point voltage is controlled by DPWM strategy, which can not only greatly reduce the switch loss but also maintain the balance of the neutral point voltage and expand the linear modulation range. The implementation of the algorithm combines the advantages of carrier-based PWM (CBPWM) and space vector PWM (SVPWM). There is no need to select the nearest three vectors (NTVs) and calculate their dwell time. Only the reference voltage needs to be modified according to the control requirements, and then by comparing the modified reference voltage with the carrier, the driver pulse required by the switching devices can be generated. Compared with the existing PWM methods, it is more simple and easy to implement. Experimental results verify the validity of the method.clamping type, hybrid discontinuous pulsewidth modulation, neutral point voltage balancing, output level sequence type, space vector pulsewidth modulation | INTRODUCTIONCompared with traditional two-level (2L) voltage source inverter (VSI), three-level neutral-point-clamped (3L-NPC) inverter has prominent advantages of simple structure, low total harmonic distortion (THD) of output voltage (or current), and low voltage stress on switching devices. 1-3 Therefore, since its introduction in 1981, 4 3L-NPC inverter has been used more and more widely, especially in medium-voltage applications.The neutral point (NP) voltage unbalance is an inherent drawback of 3L-NPC inverter, which is caused by the unbalanced charging and discharging of two DC link capacitors. The NP voltage unbalance includes AC low-frequency oscillation and DC offset. By increasing the capacitance of DC link capacitor, AC oscillation can be suppressed to a certain extent, but DC offset cannot be eliminated. Therefore, in comparison, the harm of DC offset is greater and must be avoided by other measures to ensure the stability and reliability of the inverter.

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A carrier-based PWM scheme for neutral-point voltage balancing in three-level inverters

Cited by 51 publications

References 10 publications

Modified Unipolar Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source Inverters

Modified Unipolar Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source Inverters

Wavelet PWM Technique for Single-Phase Three-Level Inverters

A hybrid discontinuous PWM algorithm of balancing neutral point voltage for 3L‐NPC inverter

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