Differential Protection of Main Transformer of Doubly-Fed Wind Farm Based on Current Synthesized Vector Trajectory Characteristics

doi:10.11930/j.issn.1004-9649.202401014

Abstract

Abstract:

During the fault ride-through process of the doubly-fed wind farms, the short-circuit current provided by the wind farm side exhibits frequency deviation, which leads to errors in the Fourier algorithm based phasor extraction. Additionally, the second harmonic restraint element may act incorrectly, leading to longterm blockage of the differential protection. This paper proposes a novel time-domain protection scheme based on the characteristics of the current synthesis vector trajectory. Based on the intrinsic differences between internal faults and external faults of transformers, two current synthesis vectors are constructed accordingly, and corresponding protection schemes are designed according to the trajectory characteristics of each synthesis vector. A simulation model of the control and protection of the delivery system of doubly-fed wind farms is constructed in PSCAD/EMTDC. Experimental results show that the proposed scheme can identify various internal faults and is not affected by the interference of magnetizing inrush current, current transformer (CT) saturation accompanying external faults and CT measurement errors accompanying external faults. The proposed scheme can operate in 15ms at the fastest and the average operation time is less than a fundamental frequency cycle.

Key words: doubly-fed wind farm, main transformer protection, synthesized vector, inrush current, current transformer saturation

Xupeng SONG, Xiaoyang YANG, Zhengzhen FAN. Differential Protection of Main Transformer of Doubly-Fed Wind Farm Based on Current Synthesized Vector Trajectory Characteristics[J]. Electric Power, 2025, 58(2): 9-21.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202401014

https://www.electricpower.com.cn/EN/Y2025/V58/I2/9

Figures/Tables 15

References 26

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案例	故障类型	动作结果			动作时间/s
案例	故障类型	文献[20]	文献[22]	本文	文献[20]	文献[22]	本文
1	正常运行	不动作	不动作	不动作
2	区外三相故障	不动作	不动作	不动作
3	区外三相故障（CT饱和）	误动作	不动作	不动作	0.025
4	空载合闸（剩磁0、合闸角0°）	不动作	不动作	不动作
5	空载合闸（剩磁0、合闸角90°）	不动作	不动作	不动作
6	空载合闸（剩磁0.9、合闸角90°）	不动作	不动作	不动作
7	空载合闸于A相匝间故障	动作	动作	动作	0.02	0.02	0.0167
8	A相匝间故障（匝比5%）	动作	动作	动作	0.02	0.02	0.0159
9	A相匝间故障（匝比20%）	动作	动作	动作	0.02	0.02	0.0160
10	低压侧AB相间故障	动作	动作	动作	0.02	0.02	0.0152
11	低压侧三相故障	动作	动作	动作	0.02	0.02	0.0152
12	低压侧三相高阻故障	动作	动作	动作	0.02	0.02	0.0151
13	高压侧A相接地故障	动作	动作	动作	0.02	0.02	0.0157
14	低电压穿越时区内故障	动作	动作	动作	0.02	0.02	0.0181

案例	故障类型	动作结果			动作时间/s
案例	故障类型	文献[20]	文献[22]	本文	文献[20]	文献[22]	本文
1	正常运行	不动作	不动作	不动作
2	区外三相故障	不动作	不动作	不动作
3	区外三相故障（CT饱和）	误动作	不动作	不动作	0.025
4	空载合闸（剩磁0、合闸角0°）	不动作	不动作	不动作
5	空载合闸（剩磁0、合闸角90°）	不动作	不动作	不动作
6	空载合闸（剩磁0.9、合闸角90°）	不动作	不动作	不动作
7	空载合闸于A相匝间故障	动作	动作	动作	0.02	0.02	0.0167
8	A相匝间故障（匝比5%）	动作	动作	动作	0.02	0.02	0.0159
9	A相匝间故障（匝比20%）	动作	动作	动作	0.02	0.02	0.0160
10	低压侧AB相间故障	动作	动作	动作	0.02	0.02	0.0152
11	低压侧三相故障	动作	动作	动作	0.02	0.02	0.0152
12	低压侧三相高阻故障	动作	动作	动作	0.02	0.02	0.0151
13	高压侧A相接地故障	动作	动作	动作	0.02	0.02	0.0157
14	低电压穿越时区内故障	动作	动作	动作	0.02	0.02	0.0181

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