Over-current low voltage ride-through operation of grid-connected converters based on thermal analysis

Power electronic devices and components Pub Date : 2023-10-01 Epub Date: 2023-09-09 DOI:10.1016/j.pedc.2023.100044

Jiashi Wang, Mengqi Xu, Yuhao Qi, Ke Ma, Cai Xu

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Abstract

The grid-connected converters are becoming an important role in modern power grid. The grid codes have been proposed for the operation of grid-connected converters. The low voltage ride-through, namely one of the grid codes, is the operation of grid-connected converters under grid fault. The reactive power is generated by gird-connected converters to support grid under low voltage ride-through operation. However, the maximum reactive power is restricted by the capacity of converter, which is designed for long-term operation. Since the low voltage ride-through is a short-term operation, the maximum output reactive power can be enhanced. An over-current low voltage ride-through operation is proposed, and it is designed based on the maximum short-term capacity. The maximum short-term capacity is designed to ensure the junction temperature of semiconductor devices in the converter under the reliable operation, which is calculated based on thermal analysis. Furthermore, the different approaches to enhancing the maximum short-term capacity is analyzed.

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基于热分析的并网变换器过电流低电压穿越运行

并网变流器在现代电网中发挥着重要作用。已经提出了用于并网转换器操作的电网代码。低电压穿越，即电网代码之一，是并网变流器在电网故障下的运行。无功功率由并网变流器产生，以支持低电压穿越运行下的电网。然而，最大无功功率受到变流器容量的限制，变流器是为长期运行而设计的。由于低电压穿越是短期操作，因此可以提高最大输出无功功率。提出了一种过电流低电压穿越操作，并根据最大短期容量进行设计。最大短期容量是为了确保转换器中半导体器件在可靠运行下的结温而设计的，该容量是基于热分析计算的。此外，分析了提高最大短期容量的不同方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Power electronic devices and components Hardware and Architecture, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Safety, Risk, Reliability and Quality

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

80 days