Analytical closed‐form expressions of DC current ripple for three‐level neutral point clamped inverters with space‐vector pulse‐width modulation

Li, Kai; Li, Mengshu; Liang, Zheng-feng; Zheng-hua, Dong; Shaoju, Tian

doi:10.1049/iet-pel.2015.0492

Cited by 18 publications

(9 citation statements)

References 20 publications

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“…The switching states and I NP for the optimized SVM are shown in Fig. 9 [19]. However, when [OON] and [PNO] are substituted, the second-largest current in SECTOR 1-(B) (I C or -I C ) flows into the neutral point.…”

Section: Proposed Optimized Svmmentioning

confidence: 99%

“…Although the performance of these solutions was excellent, they do not apply to three-level inverters. An analytical closed-form expression of DC-link ripple current for three-level NPC-type inverters has been proposed [19]. Based on analysis using this expression, an optimized switching method was introduced to reduce the DC-link ripple current for three-level inverters [20].…”

Section: Introductionmentioning

confidence: 99%

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Optimized Space-Vector Modulation to Reduce Neutral Point Current for Extending Capacitor Lifetime in Three-Level Inverters

Kim

Lee

2020

IEEE Access

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In this paper, an optimized space-vector modulation (SVM) to reduce DC-link ripple current in three-level inverters is presented. Various types of capacitors can be utilized to balance the voltage in the DC-link of voltage source inverters. Electrolytic capacitors are widely used owing to their large capacitance per volume. However, electrolytic capacitors have a short lifespan because the allowable ripple current is low. A conventional SVM that is focused on improving harmonic characteristics. Therefore, it cannot balance the DC-link ripple current properly because using some voltage vectors increases the DC-link ripple current. To overcome this limitation and extend the lifespan of the capacitors, an optimized SVM is proposed to reduce the DC-link ripple current. The proposed modulation scheme synthesizes the reference voltage by choosing voltage vectors that cause smaller increases in the DC-link ripple current, avoiding those that cause larger increases. The effectiveness of the proposed optimized SVM is verified by simulations and experimental results. INDEX TERMS Three-level inverter, dc-link ripple current, capacitor, space-vector modulation, reliability. SEOK-MIN KIM (Graduate Student Member, IEEE) received the B.S. degree in electronic engineering from Sejong University, Seoul, South Korea, in 2013, and the M.S. degree in space survey information technology and the Ph.D. degree in electrical and computer engineering from

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Section: Proposed Optimized Svmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimized Space-Vector Modulation to Reduce Neutral Point Current for Extending Capacitor Lifetime in Three-Level Inverters

Kim

Lee

2020

IEEE Access

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“…Since the calculation is very complex, the mathematical expression of the DC-link current ripple factor of three-level SVPWM, 2MV1Z, 3MV120 and 3MV are given directly, as shown in (17)- (20). The details for calculating K C for three-level SVPWM appear in [24] (see (17))…”

Section: Dc-link Current Ripple Factormentioning

confidence: 99%

“…According to [23, 24], DC‐link current ripple factor K C is defined as capacitor current ripple factor, which relates the RMS value of the DC‐link current to the output RMS current

K_{C} false(M, φ false) = \frac{I_{C_rms}}{I_{rms}} = \frac{\sqrt{I_{p - rms}^{2} - I_{p - ave}^{2}}}{I_{rms}}

where I C_ rms is the RMS current value of the DC capacitor, I rms is the RMS value of the output phase current, I p ‐ave and I p ‐rms are the average value and RMS value of i p (as shown in Fig. 1), respectively, M is the modulation ratio and φ is the power factor angle.…”

Section: Performance Analysismentioning

confidence: 99%

“…Since the calculation is very complex, the mathematical expression of the DC‐link current ripple factor of three‐level SVPWM, 2MV1Z, 3MV120 and 3MV are given directly, as shown in (17)–(20). The details for calculating K C for three‐level SVPWM appear in [24]

\begin{matrix} right leftthickmathspace.5em \\ K_{C_S V P W M_3 L} (M, φ) = \\ \{\begin{matrix} \{\frac{- 8 \sin^{2} φ + 10 + (5 - 2 \sqrt{3}) \sin 2 φ}{2 π} M \\ {- {[\frac{(\sqrt{2} π - 3 \sqrt{6}) \sin φ - 2 \sqrt{3} π \cos φ}{4 π}]}^{2} M^{2}\}}^{1 / 2}, (0 \leq M \leq \frac{1}{2}) \\ \{\frac{3 \sin 2 φ}{2 π} + \frac{3}{π} M - \frac{1}{64 π^{2} M^{2}} ([, ((, 3 \sqrt{6} + 6 \sqrt{6} M^{2})) \\ + 6 M \sqrt{2 - \frac{1}{2 M^{2}}} - 12 \sqrt{6} M + 2 \sqrt{2} π M^{2} - 12 \sqrt{2} M^{2} \arccos (\frac{1}{2 M})) \sin φ \\ {+ 4 \sqrt{6} π M^{2} \cos φ]}^{2} + \frac{2 M \cos 2 φ}{π} + false(M - π - 2 \sqrt{3} ... \end{matrix} \end{matrix}

…”

Section: Performance Analysismentioning

confidence: 99%

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Performance analysis of zero common‐mode voltage pulse‐width modulation techniques for three‐level neutral point clamped inverters

Zhao

et al. 2016

IET Power Electronics

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This study surveyed three zero common-mode voltage (CMV) pulse-width modulation (PWM) methods for threephase three-level neutral point clamped voltage source inverters, investigates their performance characteristics, and provides a comparison with the standard three-level and two-level space vector PWM methods. DC-link voltage utilisation, harmonic distortion factor, DC-link current ripple factor and power losses of each PWM method are thoroughly investigated by analysis, simulations and experiments. The research results illustrate the advantages and disadvantages of the compared methods and provide the basis for the selection and application of appropriate PWM methods in low CMV requirement fields.

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Zero-sequence voltage trajectory analysis for unbalanced distribution networks on single-line-to-ground fault condition

Meng

Wang

Tang

et al. 2018

Electric Power Systems Research

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Analytical closed‐form expressions of DC current ripple for three‐level neutral point clamped inverters with space‐vector pulse‐width modulation

Cited by 18 publications

References 20 publications

Optimized Space-Vector Modulation to Reduce Neutral Point Current for Extending Capacitor Lifetime in Three-Level Inverters

Optimized Space-Vector Modulation to Reduce Neutral Point Current for Extending Capacitor Lifetime in Three-Level Inverters

Performance analysis of zero common‐mode voltage pulse‐width modulation techniques for three‐level neutral point clamped inverters

Zero-sequence voltage trajectory analysis for unbalanced distribution networks on single-line-to-ground fault condition

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