A Comprehensive VSM Control Strategy Designed for Unbalanced Grids
A virtual synchronous machine (VSM) is a converter which, compared to other types of converters, has more friendly interactions with the power grid because it is able to simulate the external characteristics of a synchronous machine, which can provide virtual inertia and damping. When the grid volta...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/6/1169 |
| _version_ | 1798027027841810432 |
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| author | Huiyu Miao Fei Mei Yun Yang Hongfei Chen Jianyong Zheng |
| author_facet | Huiyu Miao Fei Mei Yun Yang Hongfei Chen Jianyong Zheng |
| author_sort | Huiyu Miao |
| collection | DOAJ |
| description | A virtual synchronous machine (VSM) is a converter which, compared to other types of converters, has more friendly interactions with the power grid because it is able to simulate the external characteristics of a synchronous machine, which can provide virtual inertia and damping. When the grid voltage is unbalanced, there will be negative sequence current and power oscillations. There will also be double-frequency ripples on the DC bus, which affect the normal operation of the DC power source or load. In order to solve these problems, a comprehensive control strategy is proposed in this paper. The principle of a VSM operated as a current source converter, also called VISMA, is used in the design. A complex coefficient filter is applied to separate the positive and negative sequence components of the grid voltage. By analyzing the reasons of power oscillations under unbalanced voltage, the electrical simulation part of the VSM is improved to achieve several objectives: to suppress negative sequence current and DC voltage ripples. Additionally, the rated voltage in the reactive control part is adaptively adjusted to stabilize the system. The validity of the proposed control strategy is verified by simulation and experiment. |
| first_indexed | 2024-04-11T18:44:47Z |
| format | Article |
| id | doaj.art-041b5a2c687a46c0aae3092e61edf343 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T18:44:47Z |
| publishDate | 2019-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-041b5a2c687a46c0aae3092e61edf3432022-12-22T04:08:50ZengMDPI AGEnergies1996-10732019-03-01126116910.3390/en12061169en12061169A Comprehensive VSM Control Strategy Designed for Unbalanced GridsHuiyu Miao0Fei Mei1Yun Yang2Hongfei Chen3Jianyong Zheng4School of Electrical Engineering, Southeast University, Nanjing 210096, ChinaCollege of Energy and Electrical Engineering, Hohai University, Nanjing 210098, ChinaSchool of Electrical Engineering, Southeast University, Nanjing 210096, ChinaSchool of Electrical Engineering, Southeast University, Nanjing 210096, ChinaSchool of Electrical Engineering, Southeast University, Nanjing 210096, ChinaA virtual synchronous machine (VSM) is a converter which, compared to other types of converters, has more friendly interactions with the power grid because it is able to simulate the external characteristics of a synchronous machine, which can provide virtual inertia and damping. When the grid voltage is unbalanced, there will be negative sequence current and power oscillations. There will also be double-frequency ripples on the DC bus, which affect the normal operation of the DC power source or load. In order to solve these problems, a comprehensive control strategy is proposed in this paper. The principle of a VSM operated as a current source converter, also called VISMA, is used in the design. A complex coefficient filter is applied to separate the positive and negative sequence components of the grid voltage. By analyzing the reasons of power oscillations under unbalanced voltage, the electrical simulation part of the VSM is improved to achieve several objectives: to suppress negative sequence current and DC voltage ripples. Additionally, the rated voltage in the reactive control part is adaptively adjusted to stabilize the system. The validity of the proposed control strategy is verified by simulation and experiment.https://www.mdpi.com/1996-1073/12/6/1169VSMthree-phase unbalancednegative sequencevoltage ripple |
| spellingShingle | Huiyu Miao Fei Mei Yun Yang Hongfei Chen Jianyong Zheng A Comprehensive VSM Control Strategy Designed for Unbalanced Grids Energies VSM three-phase unbalanced negative sequence voltage ripple |
| title | A Comprehensive VSM Control Strategy Designed for Unbalanced Grids |
| title_full | A Comprehensive VSM Control Strategy Designed for Unbalanced Grids |
| title_fullStr | A Comprehensive VSM Control Strategy Designed for Unbalanced Grids |
| title_full_unstemmed | A Comprehensive VSM Control Strategy Designed for Unbalanced Grids |
| title_short | A Comprehensive VSM Control Strategy Designed for Unbalanced Grids |
| title_sort | comprehensive vsm control strategy designed for unbalanced grids |
| topic | VSM three-phase unbalanced negative sequence voltage ripple |
| url | https://www.mdpi.com/1996-1073/12/6/1169 |
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