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次超同步频段下变流器广义阻抗二次侧测量方法
作者:
作者单位:

1.浙江大学电气工程学院;2.国网浙江省电力公司调控中心

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基金项目:

国家电力公司科技项目


Measurement Method for Generalized impedance of Converter Based on Perturbation in Secondary Side in Sub- and Super-Synchronous Band
Author:
Affiliation:

College of Electrical Engineering,Zhejiang University

Fund Project:

State Power Corporation of China

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    摘要:

    弱电网中变流器并网系统面临潜在的次超同步振荡风险。基于广义阻抗的稳定判据充分考虑了次超同步频段电网和变流器的耦合作用,并可将系统稳定性分析转化为单输入单输出系统进行分析。从二次侧注入扰动不仅可以测量变流器的广义阻抗,而且相比一次侧注入扰动具有成本低、操作简单的优势。为此,提出了任意功率因数下次超同步频段变流器广义阻抗二次侧测量方法。首先,推导了任意功率因数下的系统广义阻抗和考虑二次侧扰动信号注入的原-对偶复电路;然后,从电路的角度解释了所提广义阻抗测量原理。最后,给出次超同步频段任意功率因数下变流器广义阻抗二次侧测量方法。所提方法是现有广义阻抗测量方法的推广,仿真分析验证了所提方法的有效性。

    Abstract:

    The converter grid-connected system in a weak grid faces the potential risk of sub-super-synchronous oscillation. The stability criterion based on the generalized impedance considers the coupling effect between grid and the converter in sub-super-synchronous band, and can transform the system stability analysis into a single-input-single-output system. Injecting disturbances in secondary side can not only measure the generalized impedance of the converter, but also has the advantages of low cost and easy operation compared with the measurement by injecting disturbances in primary side. To this end, a method for measuring the generalized impedance of converter in secondary side in super-synchronous band at an arbitrary power factor is proposed. Firstly, we derive the system"s generalized impedance and primary-dual complex circuit considering the perturbation at secondary system. Then, the principle of measurement is explained from the point of view of circuit. Finally, we propose the measuring method of converters" generalized impedance at all power factor in sub-super synchronous band. The proposed method is a generalization of the existing generalized impedance measurement method. Simulation results verify the proposed method.

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引用本文

万炜,袁辉,王冠中,等.次超同步频段下变流器广义阻抗二次侧测量方法[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20200109008.
WAN Wei,YUAN Hui,WANG Guanzhong,et al.Measurement Method for Generalized impedance of Converter Based on Perturbation in Secondary Side in Sub- and Super-Synchronous Band[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200109008.

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  • 收稿日期:2020-01-09
  • 最后修改日期:2020-05-13
  • 录用日期:2020-03-24
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