Improvement of an ATS scheme for substations considering high new energy penetration
As the share of new energy in power systems continues to grow， the formation of islanded new energy microgrids has become more common. However， the low voltage ride-through （LVRT） characteristics of new energy often result in residual voltage on the busbars， making it challenging to meet the no-volt...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
zhejiang electric power
2025-02-01
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| Series: | Zhejiang dianli |
| Subjects: | |
| Online Access: | https://zjdl.cbpt.cnki.net/WKE3/WebPublication/paperDigest.aspx?paperID=a9c4d919-1e87-4693-b325-aa674cde9960 |
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| Summary: | As the share of new energy in power systems continues to grow， the formation of islanded new energy microgrids has become more common. However， the low voltage ride-through （LVRT） characteristics of new energy often result in residual voltage on the busbars， making it challenging to meet the no-voltage condition required for automatic transfer switch （ATS） schemes. Additionally， the lack of stable frequency and voltage support in islanded microgrids poses a risk of instability. Current solutions typically involve disconnecting new energy sources before initiating ATS operations. To enable ATS operation without disconnecting new energy， this paper analyzes the voltage and frequency dynamics of islanded microgrids after breaker tripping and their influencing factors. A fast frequency tracking algorithm based on extended Kalman filter （EKF） is introduced， leading to a rapid quasi-synchronous grid-connection scheme. When frequency deviations are significant， approximate source-load power matching within the islanded system is performed to effectively suppress inrush currents during reclosing. Finally， PSCAD simulations validate the effectiveness and feasibility of the proposed improved ATS scheme. |
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| ISSN: | 1007-1881 |