Novel Protection of the Power Collecting Lines in PMSG Wind Farms

doi:10.7652/xjtuxb201701019

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Novel Protection of the Power Collecting Lines in PMSG Wind Farms

更新时间：2025-07-09

- Novel Protection of the Power Collecting Lines in PMSG Wind Farms
- Vol. 51, Issue 1, Pages: 122-127(2017)
- 作者机构：
  
  西安交通大学电气工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201701019
  CLC： TM77
- Online First：10 January 2017，
  
  Published：2017
- 稿件说明：
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Novel Protection of the Power Collecting Lines in PMSG Wind Farms[J]. 2017, 51(1): 122-127.
DOI：

Novel Protection of the Power Collecting Lines in PMSG Wind Farms[J]. 2017, 51(1): 122-127. DOI： 10.7652/xjtuxb201701019.

摘要

针对传统三段式电流保护应用于风电场集电线时选择性和速动性不能兼顾的问题

在分析风电场集电线拓扑结构和故障特征的基础上

结合熔断器保护曲线和风机的低电压穿越特性

提出了一种能适用于风电场集电线的反时限电流保护新方法。以直驱风电场为对象

分析得出了传统三段式电流保护不适应于风电场集电线保护的结论

并且给出了新方法的整定原则

即根据熔断器下游经不同过渡阻抗故障后集电线电流与熔断器电流的最大差值关系得到集电线反时限电流保护的理论曲线

最后借助EMTP-PSCAD软件平台搭建直驱风电场模型对理论分析进行了验证。仿真结果表明

对于风电场集电线保护

反时限电流保护新方法由于采用了连续的电流保护曲线

能够很好地与熔断器保护相配合

克服了传统三段式电流保护范围小、易造成保护越级跳闸、风机脱网等缺点

而且有很强的抗过渡电阻能力

在不同的故障条件下能快速可靠地动作

兼顾了继电保护选择性和速动性的要求

因此具有一定的工程实用价值。

Abstract

To enhance performance of traditional three-section overcurrent protection used in power collecting lines

a novel inverse-time overcurrent protection is proposed via analyzing the topology and faults characteristics of power collecting lines as well as the fuse protection features and PMSG's LVRT characteristics. Taking PMSG farm as the research object

traditional overcurrent protection is no longer applicable because it often causes small protection range

override trip and turbine tripping. The inverse-time overcurrent protection curve can be obtained according to the maximum current difference between power collecting lines and fuses. Finally the effectiveness of the novel protection is verified by simulations in EMTP-PSCAD environment. Results show that for power collecting lines

the novel protection approach overcomes the shortcomings of traditional methods and achieves better selectivity and speediness. In addition

it is insensitive to transient impedance

thus could be applied to engineering.

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references

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