Abstract
The three-level neutral point clamp topology has attracted applications in medium-voltage high-power drive systems in recent years. Since the topology utilizes a neutral point voltage to achieve half bus voltage withstanding of power devices and three-level output voltage delivery, it is critical to balance the neutral point voltage in occasions of disturbed or even continuous unbalance load conditions. This paper proposes a couple of balancing techniques based on space vector modulation principle and experimentally compares their effectiveness against the existing method.
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