Grid frequency disturbance analysis based virtual synchronous generator transient performance improvement control
While virtual synchronous generators (VSG) contribute frequency stability of the power grid, it also suffers from power oscillations under perturbations. Numerous existing VSG controls have been proposed so far for transient improvement during power reference step change. However, an equally importa...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | International Journal of Electrical Power & Energy Systems |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142061525001231 |
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| Summary: | While virtual synchronous generators (VSG) contribute frequency stability of the power grid, it also suffers from power oscillations under perturbations. Numerous existing VSG controls have been proposed so far for transient improvement during power reference step change. However, an equally important VSG scenario is not quite investigated, i.e. how VSG performs during frequent grid frequency disturbances. As thoroughly analyzed in this paper, the existing methods will alter the grid frequency disturbance transfer function and worsen the transient performance, while they improve the VSG power step responses. To address the issue, a grid frequency disturbance analysis based VSG control strategy is proposed in this paper. Unlike the existing methods that add zero/pole pairs to the VSG model, the proposed control is designed to cancel out the system poles, and also stays clear of the VSG control loop with the grid frequency variation input. As a result, the power oscillation during power command steps can be suppressed with much higher bandwidth, without sacrificing its transient performance under grid frequency disturbances. A 20 kW experimental prototype is built with a back to back grid frequency step changer prototype to validate the transient performance of the proposed method under both the power reference step changes and the grid frequency extreme disturbances.© 2017 Elsevier Inc. All rights reserved. |
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| ISSN: | 0142-0615 |