An adaptive zero-sequence current protection scheme for distribution networks based on iterative fault current calculation of IIDGs
Due to the inherent output fluctuations of inverter-interfaced distributed generators （IIDGs）， the fault characteristics of distribution networks have changed， posing challenges for relay protection setting. Taking a typical low-resistance grounding system with IIDG as an example， this paper first a...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
zhejiang electric power
2025-07-01
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| Series: | Zhejiang dianli |
| Subjects: | |
| Online Access: | https://zjdl.cbpt.cnki.net/portal/journal/portal/client/paper/179b88083e3f779cb2cb2c20901ad4d6 |
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| Summary: | Due to the inherent output fluctuations of inverter-interfaced distributed generators （IIDGs）， the fault characteristics of distribution networks have changed， posing challenges for relay protection setting. Taking a typical low-resistance grounding system with IIDG as an example， this paper first analyzes the zero-sequence current characteristics during single phase-to-ground faults after IIDG integration and clarifies its impact on traditional instantaneous zero-sequence current protection. Based on this analysis， a fault current calculation algorithm for IIDGs is proposed， along with an adaptive zero-sequence current protection scheme to enhance protection selectivity and reliability， thereby accommodating high-penetration renewable energy integration. Finally， simulation results validate the effectiveness and practicality of the proposed method. |
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| ISSN: | 1007-1881 |