date: 2021-02-07T06:55:28Z
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pdf:docinfo:title: Small-Signal Stability of Multi-Converter Infeed Power Grids with Symmetry
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Keywords: power-electronic-based power system dynamics; multi-converter infeed power system; small-signal stability; large scale system analysis; network dynamics
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subject: Traditional power systems have been gradually shifting to power-electronic-based ones, with more power electronic devices (including converters) incorporated recently. Faced with much more complicated dynamics, it is a great challenge to uncover its physical mechanisms for system stability and/or instability (oscillation). In this paper, we first establish a nonlinear model of a multi-converter power system within the DC-link voltage timescale, from the first principle. Then, we obtain a linearized model with the associated characteristic matrix, whose eigenvalues determine the system stability, and finally get independent subsystems by using symmetry approximation conditions under the assumptions that all converters' parameters and their susceptance to the infinite bus (Bg) are identical. Based on these mathematical analyses, we find that the whole system can be decomposed into several equivalent single-converter systems and its small-signal stability is solely determined by a simple converter system connected to an infinite bus under the same susceptance Bg. These results of large-scale multi-converter analysis help to understand the power-electronic-based power system dynamics, such as renewable energy integration. As well, they are expected to stimulate broad interests among researchers in the fields of network dynamics theory and applications.
dc:creator: Jiawei Yu, Ziqian Yang and Meng Zhan
dcterms:created: 2021-02-07T06:49:58Z
Last-Modified: 2021-02-07T06:55:28Z
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title: Small-Signal Stability of Multi-Converter Infeed Power Grids with Symmetry
Last-Save-Date: 2021-02-07T06:55:28Z
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pdf:docinfo:keywords: power-electronic-based power system dynamics; multi-converter infeed power system; small-signal stability; large scale system analysis; network dynamics
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dc:title: Small-Signal Stability of Multi-Converter Infeed Power Grids with Symmetry
modified: 2021-02-07T06:55:28Z
cp:subject: Traditional power systems have been gradually shifting to power-electronic-based ones, with more power electronic devices (including converters) incorporated recently. Faced with much more complicated dynamics, it is a great challenge to uncover its physical mechanisms for system stability and/or instability (oscillation). In this paper, we first establish a nonlinear model of a multi-converter power system within the DC-link voltage timescale, from the first principle. Then, we obtain a linearized model with the associated characteristic matrix, whose eigenvalues determine the system stability, and finally get independent subsystems by using symmetry approximation conditions under the assumptions that all converters' parameters and their susceptance to the infinite bus (Bg) are identical. Based on these mathematical analyses, we find that the whole system can be decomposed into several equivalent single-converter systems and its small-signal stability is solely determined by a simple converter system connected to an infinite bus under the same susceptance Bg. These results of large-scale multi-converter analysis help to understand the power-electronic-based power system dynamics, such as renewable energy integration. As well, they are expected to stimulate broad interests among researchers in the fields of network dynamics theory and applications.
pdf:docinfo:subject: Traditional power systems have been gradually shifting to power-electronic-based ones, with more power electronic devices (including converters) incorporated recently. Faced with much more complicated dynamics, it is a great challenge to uncover its physical mechanisms for system stability and/or instability (oscillation). In this paper, we first establish a nonlinear model of a multi-converter power system within the DC-link voltage timescale, from the first principle. Then, we obtain a linearized model with the associated characteristic matrix, whose eigenvalues determine the system stability, and finally get independent subsystems by using symmetry approximation conditions under the assumptions that all converters' parameters and their susceptance to the infinite bus (Bg) are identical. Based on these mathematical analyses, we find that the whole system can be decomposed into several equivalent single-converter systems and its small-signal stability is solely determined by a simple converter system connected to an infinite bus under the same susceptance Bg. These results of large-scale multi-converter analysis help to understand the power-electronic-based power system dynamics, such as renewable energy integration. As well, they are expected to stimulate broad interests among researchers in the fields of network dynamics theory and applications.
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pdf:docinfo:creator: Jiawei Yu, Ziqian Yang and Meng Zhan
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creator: Jiawei Yu, Ziqian Yang and Meng Zhan
meta:author: Jiawei Yu, Ziqian Yang and Meng Zhan
dc:subject: power-electronic-based power system dynamics; multi-converter infeed power system; small-signal stability; large scale system analysis; network dynamics
meta:creation-date: 2021-02-07T06:49:58Z
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meta:keyword: power-electronic-based power system dynamics; multi-converter infeed power system; small-signal stability; large scale system analysis; network dynamics
Author: Jiawei Yu, Ziqian Yang and Meng Zhan
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