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计及谐波频率特征的含风电配电网充分式电流幅值差动保护
作者:
作者单位:

1.东南大学电气工程学院,江苏省 南京市 210096;2.南京南瑞继保电气有限公司,江苏省 南京市 211102

作者简介:

通讯作者:

基金项目:

国家自然科学基金资助项目(51677026)。


Sufficient Current Amplitude Differential Protection Considering Frequency Characteristic of Harmonic Wave for Distribution Network with Wind Power
Author:
Affiliation:

1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.NR Electric Co., Ltd., Nanjing 211102, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51677026).

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    摘要:

    风电接入配电网给传统的配电网保护方案带来挑战,考虑到配电网结构的改变和通信条件的相对落后,提取了绝大多数故障电流幅值的普遍特征,提出充分式电流幅值差动保护思想。以双馈式感应风力发电机为风电接入配电网的代表形式,分析其在低电压穿越控制方式下的短路电流谐波频率特性。提出频谱指标的概念表示谐波分量的占比大小,衡量故障时风机侧与大系统侧电流谐波频率特征的差异,基于此提出计及频谱指标的充分式电流幅值差动保护判据,对充分式保护方案进行补充。改进的保护方案更加充分地利用故障电流幅值、谐波频率信息,提高了保护的灵敏性和可靠性。最后,基于MATLAB/Simulink进行仿真,验证了该保护方案的合理性。

    Abstract:

    Wind power accessed to distribution network poses challenges to traditional protection schemes in distribution network. Considering the change of distribution network structure and the relative backwardness of the communication conditions, this paper extracts the general characteristics of the most fault current amplitudes, and puts forward the principle of sufficient current amplitude differential protection. Taking the doubly-fed induction wind generator as the representative form of wind power accessed to distribution network, the harmonic frequency characteristics of short circuit current with the control strategy of low voltage ride through are analyzed. The concept of spectrum index is proposed to measure the proportion of harmonic components, so as to measure the frequency characteristic difference of current harmonic between the wind power side and the power system. Based on this,a new criterion of sufficient current amplitude differential protection considering the harmonic frequency characteristics is proposed as the supplementary of the protection scheme. The improved protection scheme makes full use of the fault current amplitude and harmonic frequency information, and improves the sensitivity and reliability of the protection. Finally, the rationality of the protection scheme is verified by MATLAB/Simulink simulation.

    表 1 经不同大小过渡电阻短路保护判据结果对比表Table 1 Results of protection criteria in short-circuit conditions with different transition resistances
    表 3 Table 3
    图1 含风电配电网等效阻抗图Fig.1 Equivalent impedance diagram of distribution network with wind power
    图2 计及频率特性的幅值差动保护方案原理图Fig.2 Schematic diagram of amplitude differential protection considering frequency characteristic
    图3 风电接入配电网仿真模型Fig.3 Simulation model of distribution network with wind power
    图4 R g=28 Ω时保护判据的动作特性Fig.4 Operation characteristic of protection criterion (R g=28 Ω)
    图5 区外故障保护判据安全性分析图Fig.5 Security analysis diagram of protection criterion of external faults
    图6 保护判据在不同T s下的动作性能Fig.6 Operation characteristics of protection criterion with different T s
    图 双馈风电机组控制方式原理图Fig. Schematic diagram of the control mode of DFIG
    图 双馈风电机组故障时投撬棒后的暂态过程Fig. The transient process of DFIG faults after the crowbar protection is put in
    表 2 Table 2
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引用本文

朱妍,陆于平,黄涛.计及谐波频率特征的含风电配电网充分式电流幅值差动保护[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190530010.
ZHU Yan,LU Yuping,HUANG Tao.Sufficient Current Amplitude Differential Protection Considering Frequency Characteristic of Harmonic Wave for Distribution Network with Wind Power[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190530010.

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历史
  • 收稿日期:2019-05-30
  • 最后修改日期:2020-06-17
  • 录用日期:2020-05-20
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