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A Responsibility Quantification Method of Distributed Multiple Harmonic Sources Without Solving Harmonic Transfer Impedance
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Affiliation:

1.College of Electrical Engineering, Sichuan University, Chengdu 610065, China;2.Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610072, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51877141) and State Grid Sichuan Electric Power Company (No. 521997180022).

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    Abstract:

    All the existing quantification methods of harmonic responsibility of distributed multiple harmonic sources use the external port current (hereinafter referred to as the harmonic source port current) of the harmonic source equivalent circuit (Norton equivalent model in common use) to calculate the harmonic contribution of the harmonic source to the concerned bus. Since the harmonic source port current is constrained by the Kirchhoff’s law, as long as the harmonic source port current changes in the power grid, the harmonic contributions of all harmonic sources to the concerned bus will change accordingly. However, the harmonic source port current usually is the result of the coupling of harmonic source and background harmonic, so the harmonic contributions calculated by this current cannot truly reflect the harmonic emission level of the harmonic source. Therefore, this paper quantifies the harmonic responsibility of each harmonic source to the concerned bus by harmonic source current itself rather than harmonic source port current. The proposed method directly calculates the complex harmonic voltage contribution of each harmonic source to the concerned bus, and it does not need to solve the harmonic transfer impedance of the harmonic source to the concerned bus, which reduces the effect of cumulative errors and can more fairly and reasonably reflect the harmonic responsibility of each harmonic source. The effectiveness and accuracy of the proposed method are verified by simulation and experimental cases.

    表 2 背景谐波波动变大时各谐波源贡献度Table 2 Harmonic contribution of each harmonic source when background harmonic fluctuation increases
    表 1 各谐波源平均谐波贡献度Table 1 Average harmonic contribution of each harmonic source
    表 3 可疑谐波负荷的谐波贡献度Table 3 Harmonic contributions of suspicious harmonic loads
    图1 分散式多谐波源示意图Fig.1 Schematic diagram of the system with distributed multiple harmonic sources
    图1 分散式多谐波源电力系统示意图Fig.1 Schematic diagram of power system with distributed multiple harmonic sources
    图2 谐波源端口电流和谐波源电流的关系Fig.2 Relation between harmonic source port current and harmonic source current
    图3 2种计算指标的方法对应的谐波源贡献相量图Fig.3 Phasor diagram of harmonic source contributions of two methods for calculating indicators
    图4 谐波源阻抗与系统谐波阻抗之比变化时的影响分析Fig.4 Influence analysis with variation of ratio of harmonic source impedance to system harmonic impedance
    图5 各谐波源谐波贡献度Fig.5 Harmonic contribution of each harmonic source
    图6 谐波贡献度箱线图Fig.6 Box diagram of harmonic contribution
    图 IEEE 14节点系统Fig. IEEE 14-bus system
    图 谐波源节点注入谐波电流Fig. Injection harmonic current of harmonic source nodes
    图 多谐波源系统Fig. Multiple harmonic sources system
    图 测量的3次谐波电压和谐波电流Fig. Measured third-harmonic voltage and current
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Get Citation

XU Fangwei,WANG Chuan,YANG Honggeng,et al.A Responsibility Quantification Method of Distributed Multiple Harmonic Sources Without Solving Harmonic Transfer Impedance[J].Automation of Electric Power Systems,2020,44(7):178-186.DOI:10.7500/AEPS20190824004

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History
  • Received:August 24,2019
  • Revised:November 11,2019
  • Adopted:
  • Online: March 25,2020
  • Published: