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1.河海大学能源与电气学院,江苏省南京市 210098
2.南瑞集团有限公司(国网电力科学研究院有限公司),江苏省南京市 211106
3.电网运行风险防御技术与装备全国重点实验室,江苏省南京市 211106
4.智能电网教育部重点实验室(天津大学),天津市 300072
洪丰(1982—),男,硕士,高级工程师,主要研究方向:电力系统继电保护。E-mail:hongfeng@sgepri.sgcc.com.cn
吴通华(1977—),男,通信作者,博士研究生,研究员级高级工程师,主要研究方向:电力系统继电保护与控制。E-mail:wutonghua@sgepri.sgcc.com.cn
郑玉平(1964—),男,博士,教授级高级工程师,博士生导师,主要研究方向:电力系统继电保护与控制。E-mail:zhengyuping@sgepri.sgcc.com.cn
收稿:2023-02-28,
修回:2023-09-25,
网络出版:2023-10-23,
纸质出版:2023-11-25
移动端阅览
洪丰,吴通华,郑玉平等.柔性直流送出系统交流线路的自适应距离保护方法[J].电力系统自动化,2023,47(22):25-32.
HONG Feng,WU Tonghua,ZHENG Yuping,et al.Adaptive Distance Protection Method for AC Lines Connected with Flexible DC Transmission System[J].Automation of Electric Power Systems,2023,47(22):25-32.
洪丰,吴通华,郑玉平等.柔性直流送出系统交流线路的自适应距离保护方法[J].电力系统自动化,2023,47(22):25-32. DOI: 10.7500/AEPS20230228005.
HONG Feng,WU Tonghua,ZHENG Yuping,et al.Adaptive Distance Protection Method for AC Lines Connected with Flexible DC Transmission System[J].Automation of Electric Power Systems,2023,47(22):25-32. DOI: 10.7500/AEPS20230228005.
柔性直流系统接入使得电网故障特征发生明显改变,传统距离保护应用于柔性直流送出系统交流线路时存在不正确动作风险。针对该问题,指出了基于正序电压极化的距离保护动作特性受柔性直流系统控制策略影响的规律,阐明了柔性直流近端或电网侧背后发生相间故障时拒动或误动的机理。在此基础上,提出了结合暂态信息的自适应距离保护方法,利用故障初瞬自然响应阶段时域信息,构建快速方向判别元件,再结合方向判别结果自适应调整距离保护动作范围,保证距离保护正确动作。实时数字仿真试验结果验证了所提方法的有效性。
The integration of flexible DC systems significantly changes fault characteristics of the power grid
and there is a risk of incorrect operation when the traditional distance protection is applied to AC lines connected with flexible DC transmission system. Aiming at this problem
the rules are pointed out that the operation characteristics of the distance protection based on positive-sequence voltage polarization are affected by the control strategy of the flexible DC system
and the mechanism of refusal or malfunction when a phase-to-phase fault occurs at the near end of the flexible DC system or behind the power grid side is clarified. On this basis
an adaptive distance protection method combining transient information is proposed
which utilizes the time-domain information of the natural response stage at the initial fault instant to construct a fast direction discrimination element. Then
combined with the direction discrimination results
the range of distance protection operation is adaptively adjusted to ensure the correct operation of the distance protection. The results of real-time digital simulation (RTDS) experiments verify the effectiveness of the proposed method.
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