Publication
June-Seok Lee and Kyo-Beum Lee, "Time-Offset Injection Method for Neutral-Point AC Ripple Voltage Reduction in a Three-Level Inverter," IEEE Transactions on Power Electronics, vol. 31, no. 3, pp. 1931-1941, March 2016.
2016
PEEMS
-
Oct. 4, 2023
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1. Authors: June-Seok Lee and Kyo-Beum Lee
2. Title: Time-Offset Injection Method for Neutral-Point AC Ripple Voltage Reduction in a Three-Level Inverter
3. Journal: IEEE Transactions on Power Electronics
4. Vol/no/pp: vol. 31, no. 3, pp. 1931-1941
5. Date: Mar. 2016
6. Abstract
: The purpose of neutral-point voltage balancing algorithms in the three-level neutral-point clamped (3L-NPC) topology is to eliminate the voltage unbalance of top- and bottom-side dc-link voltages (neutral-point voltage). These algorithms are divided into dc unbalance and ac unbalance compensation methods. The dc unbalance causes distortion of output currents; therefore, this problem has to be solved. The ac unbalance implies that there is an ac ripple in the top- and bottom-side dc-link voltages. In applications using 3L-NPC topology, a large dc-link capacitor value is required to mitigate this ac unbalance problem. As a result, the size and the cost of applications become large and expensive. In this paper, a compensation method for mitigating the ac unbalance of the neutral-point voltage is proposed, which causes the dc-link capacitor value to be small, when a carrier-based pulse width modulation method is applied. The proposed method compensates the ac unbalance of the neutral-point voltage by adding an optimal compensation value to the reference duty signals. This compensation value is calculated simply by currents and reference duty signals. The calculation process of the optimal compensation value is discussed, and the effectiveness of the proposed method is verified with simulations and experiments.
- Oct. 4, 2023 Hyun-Woo Sim, June-Seok Lee, and Kyo-Beum Lee, "Detecting Open-Switch Faults: Using Asymmetric Zero-Voltage Switching States," IEEE Industry Applications Magazine, vol. 22, no. 2, pp. 27-37, March/April 2016.
- Oct. 4, 2023 June-Seok Lee and Kyo-Beum Lee, "A Novel Carrier-Based PWM Method for Vienna Rectifier with a Variable Power Factor," IEEE Transactions on Industrial Electronics, vol. 63, no. 1, pp. 3-12, Jan. 2016.