| 引用本文: | 杨汾艳,余超耘,盛超,等.空充变压器时直流线路沿线50 Hz分量分布的定量计算研究[J].电力系统保护与控制,2018,46(14):114-121. |
| YANG Fenyan,YU Chaoyun,SHENG Chao,et al.Research on a quantitative calculation method of 50 Hz components distribution along HVDC transmission line when energizing a no-load transformer[J].Power System Protection and Control,2018,46(14):114-121 |
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| 摘要: |
| 空充变压器可能在邻近运行直流线路上产生电压和电流的50 Hz分量，存在引发50 Hz保护动作而导致直流降功率的风险。针对空充变压器时直流线路沿线50 Hz分量的分布展开研究，为进一步制定合理的应对措施提供指导。分析了运行直流线路产生50 Hz分量的机理，并提出基于测试信号法的直流线路入口端谐波阻抗计算方法。在此基础上，研究了在不同运行方式下，空充变压器时运行直流线路沿线50 Hz分量的定量计算方法。以牛从直流的PSCAD/EMTDC仿真模型为例，利用上述方法进行计算，并将计算结果与仿真结果进行对比。分析结果表明，二者具有较好的一致性，这验证了所提定量计算方法的准确性和有效性。 |
| 关键词: 空充变压器 涌流 直流线路50 Hz分量 谐波阻抗 定量计算 PSCAD/EMTDC |
| DOI：10.7667/PSPC170995 |
| 分类号: |
| 基金项目:广东电网有限责任公司科技项目资助(GDKJQQ 20152039) |
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| Research on a quantitative calculation method of 50 Hz components distribution along HVDC transmission line when energizing a no-load transformer |
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YANG Fenyan,YU Chaoyun,SHENG Chao,LIU Zhengfu
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(Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China)
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| Abstract: |
| When energizing a no-load transformer, 50 Hz components of voltage and current on the adjacent HVDC transmission line may be generated, which may cause the action of 50 Hz protection and thus the power reduction of HVDC system. In order to provide guidance for further development of reasonable response measures, the paper researches the distribution of 50 Hz components along HVDC transmission line when energizing a no-load transformer. The generation mechanism of 50 Hz components on HVDC line is analyzed and a calculation approach based on the test signal method of harmonic impedance at the inlet of HVDC line is proposed. On this basis, a quantitative calculation method of 50 Hz components along HVDC transmission line when energizing a no-load transformer in different operation modes is studied. Taking a PSCAD/EMTDC simulation model of Niu-Cong HVDC project as an example, the calculation result of the proposed method is compared with the simulation result. It shows that the results of two methods are similar, which verifies the accuracy and validity of the proposed method. This work is supported by Science and Technology Project of Guangdong Power Grid Limited Liability Company (No. GDKJQQ20152039). |
| Key words: energizing a no-load transformer inrush current 50 Hz components on HVDC transmission line harmonic impedance quantitative calculation PSCAD/EMTDC |
