Realization of Harmonic Impedance Simulation Calculation Method for Grounding Grid in Substation

2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering

Liu, Kang^1 ; Wen, Dingjun^1 ; Zhang, Guangdong^1 ; Hu, Chunjiang^1 ; Chen, Ying^2

Electrical Power Research Institute, Gansu Electric Power Corporation, Lanzhou

73005, China^1

South West Jiao Tong University, Chengdu

610000, China^2

关键词: Ground grid models;    Grounding impedance;    Harmonic impedances;    Harmonic interference;    Impedance angles;    Measurement and analysis;    Power frequency;    Simulation calculation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/394/4/042129/pdf
DOI  :  10.1088/1757-899X/394/4/042129

来源: IOP

【 摘 要 】

There is a difference between the actual impedance of substations' ground grid under harmonic interference and that measured under power frequency. Especially under strong harmonic interference, the difference becomes more obvious between the actual one and that measured under power frequency. A method is proposed in this paper to calculate parameters of ground grid models by measuring the ground grid impedances under power frequency and then calculate those under harmonic interference. This method is capable of solving the problem that it is impossible to measure the actual grounding impedance of substations operating under harmonic waves. The feasibility of the method is verified by means of simulating calculations. After correcting by this method, the grounding impedance modulus error becomes less than 2% and the impedance angle error less than 10%. This method may be applied to the measurement and analysis of grounding impedances of substations under harmonic interference.