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Transient current similarity based protection for wind farm transmission lines

机译：基于暂态电流相似性的风电场输电线路保护

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摘要

Large-scale wind farms are usually integrated into the transmission system. Applying traditional steady-state power-frequency based protection strategies in these transmission lines creates challenges such as: (1) the fault current of the wind farm might be dominated by non-power-frequency components caused by the activation of their own protection systems during fault ride through (FRT). The frequency of the dominant component is determined by the rotor speed at the fault inception and might vary from 0.7 to 1.3 times the power frequency. This will create errors in phasors calculated at the power-frequency. (2) The steady-state fault current angles of wind farms are fully controlled by their power converters. The variety of control actions of the different converters during FRT makes these phase angles greatly deviate from those of the synchronous generators. Protection systems that use double-ended phasors such as current differential schemes will suffer from low sensitivity or even malfunction when large-scale wind farms are integrated. Therefore, a novel full-time transient current waveform similarity based protection scheme is proposed to deal with these issues. The full-time current protection scheme uses both the power-frequency and non-power-frequency characteristics and can therefore reduce the influence of power-frequency phasor calculation errors to a minimum. The proposed method uses the transient current (within 10 ms after the fault inception) and is ignores the features of the steady-state fault current. In other words, the proposed protection is suitable for wind farms with a variety of controls. In the proposed method, the correlation coefficient index is used to calculate the similarity of the transient current signals at both ends of the line. Both experimental and field testing results show that using a common sampling frequency, the proposed protection scheme only uses current information and can correctly identify all types of external and internal line faults in a short period of time and can offer better performance for high fault resistance and noise, both for different types of wind farms. All these features and contributions make the new protection feasible for industry application.
机译：大型风电场通常集成在传输系统中。在这些输电线路中采用传统的基于稳态工频的保护策略会带来以下挑战：（1）风电场的故障电流可能由非工频分量控制，这些非工频分量是由其自身的保护系统在激活期间引起的。故障穿越（FRT）。主导分量的频率由故障开始时的转子速度确定，并且可能在功率频率的0.7到1.3倍之间变化。这将在以功率频率计算出的相量中产生误差。 （2）风电场的稳态故障电流角由其功率转换器完全控制。 FRT期间不同转换器的各种控制动作使这些相角大大偏离了同步发电机的相角。当集成大型风电场时，使用双相相量的保护系统（例如电流差动方案）将遭受低灵敏度甚至故障的困扰。因此，提出了一种基于全时瞬态电流波形相似度的保护方案来解决这些问题。全时电流保护方案同时利用了工频特性和非工频特性，因此可以将工频相量计算误差的影响降至最低。所提出的方法使用瞬态电流（在故障开始后的10 ms内），而忽略了稳态故障电流的特性。换句话说，建议的保护措施适用于具有各种控制措施的风电场。在所提出的方法中，相关系数指数用于计算线路两端的暂态电流信号的相似度。实验和现场测试结果均表明，使用共同的采样频率，所提出的保护方案仅使用电流信息，并且可以在短时间内正确识别所有类型的外部和内部线路故障，并且可以提供更高的性能，从而具有较高的抗故障能力和抗干扰能力。噪音，适用于不同类型的风电场。所有这些特性和贡献使新的保护措施在工业应用中变得可行。

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  • 来源
    《Applied Energy》 |2018年第1期|42-51|共10页
  • 作者

    Jia Ke; Li Yanbin; Fang Yu; Zheng Liming; Bi Tianshu; Yang Qixun;

  • 作者单位

    North China Elect Power Univ, State Key Lab Alternat Elect Power Syst Renewable, Beijing, Peoples R China;

    State Grid Corp China, North China Branch, Beijing, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternat Elect Power Syst Renewable, Beijing, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternat Elect Power Syst Renewable, Beijing, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternat Elect Power Syst Renewable, Beijing, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternat Elect Power Syst Renewable, Beijing, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Wind farm; Transient current; Waveform similarity; Pilot protection; Transmission line;

    机译：风电场;暂态电流;波形相似度;先导保护;输电线路;

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