Impact Evaluation for Distance Protection of Southern Suzhou 500kV UPFC

2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) Pub Date : 2019-06-01 DOI:10.1109/ICIEA.2019.8834339

Liang Zhang, Bin Zhou, Peng Li, Yubo Yuan, Jingnan Xu, Xiangping Kong

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引用次数: 1

Abstract

The 500kV unified power flow controller (UPFC) has been built in Southern Suzhou, which improves the power supply capacity of the grid. However, due to the UPFC access, the impedance value of the conventional distance protection measurement could not truly reflect the fault location. To solve it, the impact of the UPFC access on the transmission line protection is studied in this paper. Firstly, the model of unified power flow controller based on modular multilevel converter (MMC-UPFC) was established. The control strategies for both the series and parallel side converters were designed. Then, by the fault sequence network diagram, the equivalent circuit model is given, and the influence of the UPFC access transmission line on the traditional distance protection is analyzed in details. Finally, simulations were carried out in PSCAD/EMTDC to verify the different mode effect on the traditional distance protection, when a single-phase ground fault by the metal occurs. The results show that in STATCOM mode, the apparent impedance is affected by the reactive power injected or absorbed, and it is more severe in UPFC mode.

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苏南500kV UPFC距离保护影响评价

苏南地区建成500kV统一潮流控制器(UPFC)，提高了电网供电能力。然而，由于UPFC接入，传统距离保护测量的阻抗值不能真实反映故障位置。为了解决这一问题，本文研究了UPFC接入对传输线保护的影响。首先，建立了基于模块化多电平变换器(MMC-UPFC)的统一潮流控制器模型。设计了串联侧变换器和并联侧变换器的控制策略。然后，通过故障序列网络图，给出了等效电路模型，详细分析了UPFC接入传输线对传统距离保护的影响。最后，在PSCAD/EMTDC中进行了仿真，验证了当单相金属接地故障发生时，不同模式对传统距离保护的影响。结果表明，在STATCOM模式下，视阻抗受到注入或吸收的无功功率的影响，在UPFC模式下影响更为严重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA)

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