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首页> 外文期刊>IEEE Transactions on Industrial Electronics >Modulation Methods for Neutral-Point-Clamped Wind Power Converter Achieving Loss and Thermal Redistribution Under Low-Voltage Ride-Through
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Modulation Methods for Neutral-Point-Clamped Wind Power Converter Achieving Loss and Thermal Redistribution Under Low-Voltage Ride-Through

机译：低压穿越时实现损耗和热再分布的中性点钳位风电变流器的调制方法

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摘要

The three-level neutral-point (NP)-clamped (3L-NPC) converter is a promising multilevel topology in the application of megawatt wind power generation systems. However, the growing requirements by grid codes may impose high stress and even give reliability problem to this converter topology. This paper investigates the loss and thermal performances of a 10-MW 3L-NPC wind power inverter undergoing low-voltage ride-through (LVRT) operation. A series of new space vector modulation methods is then proposed to relocate the thermal loading among the power switching devices. It is concluded that, with the proposed modulation methods, the thermal distribution in the 3L-NPC wind power inverter undergoing LVRT becomes more equal, and the junction temperature of the most stressed devices can be also relieved. Also, the control ability of the dc-bus NP potential, which is one of the crucial considerations for the 3L-NPC converter, is even more improved by the proposed modulation methods.
机译：在兆瓦级风力发电系统的应用中，三级中性点（NP）钳位（3L-NPC）转换器是一种很有前途的多级拓扑。但是，网格代码不断增长的要求可能会带来很高的压力，甚至给此转换器拓扑带来可靠性问题。本文研究了正在经历低压穿越（LVRT）操作的10兆瓦3L-NPC风力发电逆变器的损耗和热性能。然后提出了一系列新的空间矢量调制方法，以在电源开关设备之间重新分配热负载。结论是，采用所提出的调制方法，经过LVRT的3L-NPC风力发电逆变器中的热分布变得更加均等，并且还可以缓解受压最大的器件的结温。而且，通过提出的调制方法甚至可以进一步提高对3L-NPC转换器至关重要的直流总线NP电位的控制能力。

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