柔直电网站内单相接地故障分析及过电压抑制
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TM71

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中国南方电网有限责任公司科技项目(ZBKJXM20210209)

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    摘要:

    柔直电网换流站内单相接地故障的电磁暂态过程复杂且易产生过电压,严重影响系统的安全稳定运行。文中将换流站内单相接地故障分成交流故障区和直流故障区,首先采用复合序网络定量分析交流侧过电压机理及零序电压特征。然后,基于换流器控制器方程推导得到故障序分量从交流侧向直流侧传播的规律,得出零序电压是导致直流侧和其他换流站过电压的主要因素。此外,为了抑制直流侧过电压,提出一种零序过电压控制方法,并给出控制器参数的选择方案。最后,基于PSCAD搭建柔直电网仿真模型,仿真结果验证了故障机理推演的正确性及过电压抑制策略的有效性,提升了站内单相接地故障后的安全稳定运行能力。

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Single-phase-to-ground fault analysis and overvoltage suppression in the converter station of flexible DC grid
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    Abstract:

    The electromagnetic transient process of flexible direct current (DC) grid is complex. It easily causes overvoltage when a single-phase-to-ground fault occurs in converter station,which seriously affects the safe and stable operation of the system. The converter station is divided into alternating current (AC) fault area and DC fault area by single-phase-to-ground fault. Firstly,the compound sequence network is used to quantitatively analyze the mechanism of AC overvoltage and characteristics of fault zero-sequence components. Then,the propagation law of fault sequence components from AC side to DC side is deduced based on the control equation of converter,which reveals that the fault zero-sequence component is the main factor leading to overvoltage at the DC side and other converters. In addition,a DC overvoltage control strategy is proposed to suppress DC side overvoltage,and the selection method of controller parameters is given. At last,a test system is built on the basis of PSCAD simulation. The simulation results show the correctness of fault mechanism deduction and the effectiveness of overvoltage suppression strategy which improves the safety and stability of power system after single-phase-to-ground fault in the converter station.

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李岩,黄豫,潘旭东,袁康龙.柔直电网站内单相接地故障分析及过电压抑制[J].电力工程技术,2021,40(5):71-77

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  • 收稿日期:2021-03-13
  • 最后修改日期:2021-05-22
  • 录用日期:2021-03-25
  • 在线发布日期: 2021-09-30
  • 出版日期: 2021-09-28