Impact of Nonlinearity on Type-3 WT's Fault Current

Yuanzhu Chang, Jiabing Hu, E. Zhang, Xiaojie Zhang
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引用次数: 2

Abstract

Due to Type-3 wind turbine (WT) has already become a highly penetrated power source in modern power systems, characterizing its properties during short circuit is a basic requirement for system analysis. However, although nonlinearity, such as saturation effect of doubly fed induction generator (DFIG) and the dynamic of phase-locked loop (PLL), is a critical determinant, it has been simply ignored in the existing literatures. This paper is focusing on the impact of nonlinearity on Type-3 WT's fault current. First, a 10kW experimental prototype is carefully designed in laboratorial scale to demonstrate the dynamic performance of Type-3 WT during low voltage ride through (LVRT). Then, the impact of those nonlinear elements on fault current is quantified through the comparisons with the analytical results that are calculated without the consideration of nonlinearity. It shows that the nonlinear feature mainly influences the maximum value of fault current in the instant control time scale. Hence, expressions and method are proposed to evaluate the actual momentary current of a Type-3 WT. The conclusion of this paper is expected to be implemented in rating circuit breakers and other equipment.
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非线性对3型小波故障电流的影响
由于3型风力发电机组已成为现代电力系统中高度渗透的电源,表征其短路特性是系统分析的基本要求。然而,尽管非线性,如双馈感应发电机(DFIG)的饱和效应和锁相环(PLL)的动态,是一个关键的决定因素,但在现有的文献中被简单地忽略了。本文主要研究非线性对3型小波故障电流的影响。首先,在实验室规模上精心设计了一个10kW的实验样机,以演示3型WT在低电压穿越(LVRT)期间的动态性能。然后,通过与不考虑非线性因素的解析计算结果的比较,量化这些非线性因素对故障电流的影响。结果表明,在瞬时控制时间尺度上,非线性特性主要影响故障电流的最大值。由此,提出了3型小波实际瞬时电流的计算表达式和方法。本文的结论有望应用于额定断路器等设备。
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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