基于去趋势分析的大规模双馈风电场送出变压器差动保护

doi:10.11930/j.issn.1004-9649.202210091

中国电力 ›› 2023, Vol. 56 ›› Issue (7): 186-197.DOI: 10.11930/j.issn.1004-9649.202210091

基于去趋势分析的大规模双馈风电场送出变压器差动保护

徐艳春¹, 范钟耀¹, 孙思涵¹, MI Lu²

1. 梯级水电站运行与控制湖北省重点实验室（三峡大学），湖北宜昌 443002;
2. 德克萨斯农工大学电气与计算机工程学院，美国德克萨斯州卡城 77840

收稿日期:2022-10-24 修回日期:2023-05-17 发布日期:2023-07-28
作者简介:徐艳春(1973-),女,通信作者,副教授,博士,从事主动配电网电能质量检测、电力系统保护与控制研究,E-mail:xyc7309@163.com;范钟耀(1998-),男,硕士研究生,从事风力发电及其对继电保护的影响研究,E-mail:fanzyao@163.com
基金资助:
国家自然科学基金资助项目（51707102）。

Differential Protection of Transmission Transformer for Large-Scale Doubly-Fed Wind Farms Based on Detrended Analysis

XU Yanchun¹, FAN Zhongyao¹, SUN Sihan¹, MI Lu²

1. Hubei Provincial Key Laboratory of Operation and Control of Cascaded Hydropower Station, China Three Gorges University, Yichang 443002, China;
2. Department of Electrical and Computer Engineering, Texas A&M University, College Station 77840, USA

Received:2022-10-24 Revised:2023-05-17 Published:2023-07-28
Supported by:
This work is supported by National Natural Science Foundation of China (No.51707102).

摘要/Abstract

摘要： 由于双馈风电场输出的故障电流具有频偏特性且含有较大的谐波分量，当双馈风电场送出变压器发生内部故障时，变压器差动电流中二次谐波与基波的比值增大，使得变压器差动保护面临延时动作的风险；且系统发生故障时，双馈风电场输出的故障电流中存在大量非周期分量，会使得送出变压器中的电流互感器更易发生饱和现象，致使传统变压器差动保护的可靠性降低。提出了基于去趋势分析的大规模风电场送出变压器的差动保护方案。首先，将采样电流通过滑动数据窗进行去趋势分析得到去趋势残差函数，然后，结合电流波形斜率特征完成对变压器励磁涌流及故障差流（包含电流互感器饱和状态下）的有效区分。最后，在PSCAD中搭建了双馈风电场送出系统，在不同工况下验证且分析了所提保护方案的适用性。

关键词: 变压器差动保护, 双馈风电场, 二次谐波, 电流互感器饱和, 去趋势分析

Abstract: Since the fault current output from the doubly-fed wind farm has frequency deviation characteristics and contains large harmonic components, when an internal fault occurs in the transmission transformer for the doubly-fed wind farm, the ratio of the second harmonic to the fundamental wave in the differential current of the transformer increases, which makes the differential protection of the transformer face the risk of delay action. Moreover, when the system fails, a large number of non-periodic components in the fault current output from the doubly-fed wind farm will make the current transformer in the transmission transformer more prone to saturation, resulting in reduced reliability of the differential protection of traditional transformers. This paper proposes a differential protection scheme for the transmission transformer for large-scale wind farms based on detrended analysis. Firstly, the sampling current is processed by detrended analysis through the sliding data window to obtain the detrended residual function, and then the slope characteristics of the current waveform are utilized to complete the effective distinction between the magnetizing inrush current and the fault differential current (including the current transformer saturation state) of the transformer. The proposed protection scheme is validated to be applicable under different operating conditions by building a transmission system for the doubly-fed wind farm in PSCAD.

Key words: differential protection of transformer, doubly-fed wind farm, second harmonic, current transformer saturation, detrended analysis

徐艳春, 范钟耀, 孙思涵, MI Lu. 基于去趋势分析的大规模双馈风电场送出变压器差动保护[J]. 中国电力, 2023, 56(7): 186-197.

XU Yanchun, FAN Zhongyao, SUN Sihan, MI Lu. Differential Protection of Transmission Transformer for Large-Scale Doubly-Fed Wind Farms Based on Detrended Analysis[J]. Electric Power, 2023, 56(7): 186-197.

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基于去趋势分析的大规模双馈风电场送出变压器差动保护

Differential Protection of Transmission Transformer for Large-Scale Doubly-Fed Wind Farms Based on Detrended Analysis

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基于去趋势分析的大规模双馈风电场送出变压器差动保护

Differential Protection of Transmission Transformer for Large-Scale Doubly-Fed Wind Farms Based on Detrended Analysis

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