Control Scheme of Spread Frequency Band for High Power Impedance Measuring Converter with Chirp Signal Injection
Impedance measurement is an effective solution for evaluating stability of a power system with high penetration of renewable sources. In this paper, the impedance measurement is achieved by a typical high-power impedance measuring converter (HPIM-converter) with chirp signal injection. The modulatio...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
China electric power research institute
2024-01-01
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| Series: | CSEE Journal of Power and Energy Systems |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9877978/ |
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| Summary: | Impedance measurement is an effective solution for evaluating stability of a power system with high penetration of renewable sources. In this paper, the impedance measurement is achieved by a typical high-power impedance measuring converter (HPIM-converter) with chirp signal injection. The modulation saturation phenomenon of the HPIM-converter is revealed, and the frequency sweep boundary is analyzed in detail. To expand the rated frequency range of the HPIM-converter, a spread frequency band control scheme based on an over-modulation technique is proposed in this paper. The proposed control method enlarges the rated frequency band and can inject a disturbance voltage into the system under test with consistent amplitude in the rated frequency band. Also, a smooth transition strategy between linear modulation mode and over-modulation mode is proposed for suppressing signal fluctuation. Finally, the effectiveness of the proposed method is verified by simulation tests. |
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| ISSN: | 2096-0042 |