Research on Neutral Point Potential Balance of Three-Level Inverter

Jing Cui-Ru, Li Qian, Wu Yi-fei, Shi-Zhou Xu, Fu Qiang
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引用次数: 1

Abstract

With the rapid development of new energy and the energy-saving technology, three-level inverter has gradually become the core of power conversion because of its large output capacity, good dynamic performance, low harmonic content and high inversion efficiency. In the view of the inherent problem of uneven DC side voltage distribution in T type three-level inverter, this paper analyzes the influence factors of neutral point potential imbalance based on SVPWM (Space Vector Pulse width Modulation method), and establishes the midpoint average current mathematical model. According to the current state of the midpoint under different types of vector action, a self-adaptive distribution factor method is proposed, which can self-adjust according to the potential difference of the midpoint, and the expected effect is obtained in the simulation.
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三电平逆变器中性点电位平衡研究
随着新能源和节能技术的快速发展,三电平逆变器因其输出容量大、动态性能好、谐波含量低、逆变效率高等优点,逐渐成为电力转换的核心。针对T型三电平逆变器直流侧电压分布不均匀的固有问题,本文基于空间矢量脉宽调制方法(SVPWM)分析了中点电位不平衡的影响因素,建立了中点平均电流数学模型。根据中点在不同类型矢量作用下的当前状态,提出了一种自适应分布因子方法,该方法可以根据中点的电位差进行自调整,并在仿真中获得了预期的效果。
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