Impedance-sum stability criterion for power electronic systems with two converters/sources
The impedance-ratio criterion is widely adopted for analyzing the small-signal stability of systems with cascaded power electronic converters. However, the impedance ratio is formed differently for different cascaded systems. In this paper, a generic impedance-sum criterion is proposed for the stabi...
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sg-ntu-dr.10356-1059972019-12-06T22:02:32Z Impedance-sum stability criterion for power electronic systems with two converters/sources Zhong, Qing-Chang Zhang, Xin School of Electrical and Electronic Engineering Power Electronic Systems With Two Converters/Sources Cascaded Systems DRNTU::Engineering::Electrical and electronic engineering The impedance-ratio criterion is widely adopted for analyzing the small-signal stability of systems with cascaded power electronic converters. However, the impedance ratio is formed differently for different cascaded systems. In this paper, a generic impedance-sum criterion is proposed for the stability of general power electronic systems with two converters/sources. The two converters/sources can be in parallel operation, such as parallel-operated voltage-controlled inverter systems in microgrids and parallel-operated current-controlled inverter systems, or in series (cascaded) operation, such as cascaded DC/DC converter systems and grid-connected current-controlled converters. In this paper, it is shown at first that in order for a converter/source to be stable both the impedance and its inverse should be stable, that is, the impedance should not have any right-half-plane (RHP) zeros or RHP poles. Then, it is shown that a system with two individually stable converters/sources is stable if and only if the sum of the individual impedances does not have any RHP zeros or, equivalently, the impedance sum does not encircle the origin clockwise. This generic criterion is then demonstrated via applications covering all four possible cases. Published version 2019-06-20T04:53:25Z 2019-12-06T22:02:32Z 2019-06-20T04:53:25Z 2019-12-06T22:02:32Z 2019 Journal Article Zhong, Q.-C., & Zhang, X. (2019). Impedance-sum stability criterion for power electronic systems with two converters/sources. IEEE Access, 7, 21254-21265. doi:10.1109/ACCESS.2019.2894338 https://hdl.handle.net/10356/105997 http://hdl.handle.net/10220/48866 http://dx.doi.org/10.1109/ACCESS.2019.2894338 en IEEE Access © 2019 IEEE. This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ 12 p. application/pdf |
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Power Electronic Systems With Two Converters/Sources Cascaded Systems DRNTU::Engineering::Electrical and electronic engineering Zhong, Qing-Chang Zhang, Xin Impedance-sum stability criterion for power electronic systems with two converters/sources |
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The impedance-ratio criterion is widely adopted for analyzing the small-signal stability of systems with cascaded power electronic converters. However, the impedance ratio is formed differently for different cascaded systems. In this paper, a generic impedance-sum criterion is proposed for the stability of general power electronic systems with two converters/sources. The two converters/sources can be in parallel operation, such as parallel-operated voltage-controlled inverter systems in microgrids and parallel-operated current-controlled inverter systems, or in series (cascaded) operation, such as cascaded DC/DC converter systems and grid-connected current-controlled converters. In this paper, it is shown at first that in order for a converter/source to be stable both the impedance and its inverse should be stable, that is, the impedance should not have any right-half-plane (RHP) zeros or RHP poles. Then, it is shown that a system with two individually stable converters/sources is stable if and only if the sum of the individual impedances does not have any RHP zeros or, equivalently, the impedance sum does not encircle the origin clockwise. This generic criterion is then demonstrated via applications covering all four possible cases. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Zhong, Qing-Chang Zhang, Xin |
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Article |
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Zhong, Qing-Chang Zhang, Xin |
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Zhong, Qing-Chang |
title |
Impedance-sum stability criterion for power electronic systems with two converters/sources |
title_short |
Impedance-sum stability criterion for power electronic systems with two converters/sources |
title_full |
Impedance-sum stability criterion for power electronic systems with two converters/sources |
title_fullStr |
Impedance-sum stability criterion for power electronic systems with two converters/sources |
title_full_unstemmed |
Impedance-sum stability criterion for power electronic systems with two converters/sources |
title_sort |
impedance-sum stability criterion for power electronic systems with two converters/sources |
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2019 |
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https://hdl.handle.net/10356/105997 http://hdl.handle.net/10220/48866 http://dx.doi.org/10.1109/ACCESS.2019.2894338 |
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