一种适用于直流微网的电流差动保护研究
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1.西安工程大学电子信息学院;2.合肥工业大学电气与自动化工程学院;3.国网内蒙古东部电力有限公司电力科学研究院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Research on a current differential protection suitable for DC micro-grid
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1.School of Electronic Information,Xi’an Polytechnic University;2.School of Electrial Engineering and Automation, Hefei University of Technology;3.State Grid East Inner Mongolia Electric Power Research Institute

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    摘要:

    直流微网线路发生故障时,故障电流的迅速飙升对系统供电的可靠性极其不利,因此快速检测并切除故障对其可靠运行至关重要。传统电流差动保护具有良好的速动性和选择性,但其灵敏度受短路阻抗影响较大,在高阻短路故障时可能出现拒动问题。文中针对放射形直流微电网,根据故障点两端电流变化特性,引入低制动系数实现对高阻故障的检测,并在PSCAD/EMTDC中搭建直流微网模型对保护方案进行了仿真验证,结果表明被保护线路发生不同短路阻抗故障时,改进的保护方案均能够准确识别并切除故障。

    Abstract:

    When a DC micro-grid line fails, the rapid surge of fault current is extremely detrimental to the reliability of the system power supply, so it is very important to detect and remove the fault quickly for its reliable operation. The traditional current differential protection has good quick performance and selectivity, but its sensitivity is greatly affected by short circuit impedance, and may refuse to move in case of high resistance short circuit fault. Aiming at the radial DC micro-grid, according to the current variation characteristics at both ends of the fault point, low braking coefficient is introduced to realize the detection of high resistance faults, and the protection scheme is simulated and verified by building a DC micro-grid model in PSCAD/EMTDC. The results show that the improved protection scheme can accurately identify and remove the faults when different short-circuit impedance faults occur in the protected circuit.

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  • 收稿日期:2021-01-17
  • 最后修改日期:2021-04-12
  • 录用日期:2021-04-14
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