High Resistance Grounding Fault Perception and Identification Method in Asymmetric Distribution Network
Aiming at the problems of fault perception and identification in high resistance grounding fault of distribution network, a high resistance grounding fault perception method for parameter-asymmetric distribution network based on damping rate variation is proposed. In this method, the zero-sequence v...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
State Grid Energy Research Institute
2025-02-01
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| Series: | Zhongguo dianli |
| Subjects: | |
| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202406070 |
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| Summary: | Aiming at the problems of fault perception and identification in high resistance grounding fault of distribution network, a high resistance grounding fault perception method for parameter-asymmetric distribution network based on damping rate variation is proposed. In this method, the zero-sequence voltage is actively regulated by the active inverter device for a short time, and the fault is judged according to the variation of the system damping rate before and after fault. On the basis of realizing the sensitive perception of high resistance grounding fault, a fault type identification method based on the change characteristics of zero-sequence equivalent admittance phase angle of the system is further proposed. This identification method actively changes the zero-sequence voltage amplitude regulation coefficient, and accurately identifies the transient and permanent grounding fault types according to the change trajectory of admittance phase angle under different grounding modes. The simulation analysis shows that the proposed method can be applied to the three-phase parameter asymmetric distribution network. The proposed method can realize fault perception and identification in low and high resistance grounding faults under different operation modes, and has strong resistance to transition resistance and strong applicability. |
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| ISSN: | 1004-9649 |