Time-Offset Injection Method for Neutral-Point AC Ripple Voltage Reduction in a Three-Level Inverter


The purpose of neutral-point voltage balancing algorithms within the three-level neutral-point clamped (3L-NPC) topology is to eliminate the voltage unbalance of prime- and bottom-facet dc-link voltages (neutral-purpose voltage). These algorithms are divided into dc unbalance and ac unbalance compensation ways. The dc unbalance causes distortion of output currents; therefore, this downside needs to be solved. The ac unbalance implies that there's an ac ripple within the top- and bottom-aspect dc-link voltages. In applications using 3L-NPC topology, a large dc-link capacitor value is needed to mitigate this ac unbalance drawback. Thus, the dimensions and the value of applications become giant and expensive. In this paper, a compensation methodology for mitigating the ac unbalance of the neutral-point voltage is proposed, that causes the dc-link capacitor worth to be tiny, when a carrier-based mostly pulse width modulation technique is applied. The proposed methodology compensates the ac unbalance of the neutral-point voltage by adding an optimal compensation worth to the reference duty signals. This compensation price is calculated merely by currents and reference duty signals. The calculation process of the optimal compensation value is discussed, and also the effectiveness of the proposed technique is verified with simulations and experiments.

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