基于直流线路参数的50 Hz谐波放大评估方法

LI Xiaohua

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基于直流线路参数的50 Hz谐波放大评估方法

更新时间：2025-08-13

- 基于直流线路参数的50 Hz谐波放大评估方法
- Automation of Electric Power Systems Vol. 42, Issue 6, Pages: 146-151(2018)
- 作者机构：
  
  华南理工大学电力学院,广东省,广州市,510640
- 作者简介：
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- Published：2018
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LI Xiaohua. [J]. Automation of electric power systems, 2018, 42(6): 146-151.
DOI：

LI Xiaohua. [J]. Automation of electric power systems, 2018, 42(6): 146-151. DOI：

摘要

针对近几年现场运行暴露出来的变压器空投时50 Hz谐波电流流经直流线路出现放大的问题，提出了一种通过直流线路参数来评估直流工程50 Hz谐波放大的方法。首先，推导了长距离直流输电线路50 Hz参数计算方法；其次，依托于某在运高压直流工程进行直流线路50 Hz参数计算，并以此深入研究了直流线路出现50 Hz谐波放大的本质原因以及谐波放大的极值点，进而提出了用于评估直流谐波放大水平的指标；最后，通过EMTDC仿真平台验证了所提方法的正确性，并应用于实际工程进行谐波评估。结果表明:通过50 Hz参数计算方法评估的直流谐波放大水平与实际工程一致，所提出的谐波放大极值点计算和放大评估方法不依赖于详细直流模型和EMTDC仿真。

Abstract

In recent years

the enlargement phenomenon of 50 Hz harmonic current on DC line caused by energization of unloaded transformer is exposed on HVDC projects in field. To solve the problem above

a 50 Hz harmonic amplification evaluation method based on DC line parameters is proposed. Firstly

the calculation method of 50 Hz parameters for the long distance HVDC transmission line is derived. Secondly

50 Hz parameters of DC lines in a certain DC project are calculated. Then the essential reason and the extreme point of harmonic amplification are analyzed based on the results

furthermore

the index for evaluating DC harmonic amplification level is proposed. Finally

the correctness of the method proposed is verified by EMTDC simulation results

and the method is applied to the harmonic evaluation of an actual project. The results show that the evaluation results obtained by the proposed method are consistent with the practical project. Both the methods proposed to calculate harmonic amplification extreme points and evaluate DC harmonic level are independent with the detailed DC model and EMTDC simulation.

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