International Journals 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, Mar. 2016. -SCI
2016
본문
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 dclink 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.
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