Research on Neutral Point Potential Balance of Three-Level Inverter

摘要: With the rapid development of new energy and energy-saving technology, three-level inverter has gradually become core power conversion because its large output capacity, good dynamic performance, low harmonic content high inversion efficiency. In view inherent problem uneven DC side voltage distribution in T type inverter, this paper analyzes influence factors neutral point potential imbalance based on SVPWM (Space Vector Pulse width Modulation method), establishes midpoint average current mathematical model. According to state under different types vector action, a self-adaptive factor method is proposed, which can self-adjust according difference midpoint, expected effect obtained simulation.