Sang-Won An, Seok-Min Kim, and Kyo-Beum Lee, "Optimized Space-Vector Modulation to Reduce Neutral Point Current for Extending Capacitor Lifetime in Three-Level Inverters," IEEE Access, vol. 8, pp. 97689–97697, May 2020. -SCIE > Paper

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Paper

International Journals Sang-Won An, Seok-Min Kim, and Kyo-Beum Lee, "Optimized Space-Vector Modulation to Reduce Neutral Point Current for Extending Capacitor Lifetime in Three-Level Inverters," IEEE Access, vol. 8, pp. 97689–97697, May 2020. -SCIE

2020

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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.

 

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