Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control
Inertia effect and damping capacity, which are the basic characteristics of traditional power systems, are critical to grid frequency stability. However, the inertia and damping characteristics of grid-tied photovoltaic generation systems (GPVGS), which may affect the frequency stability of the grid...
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MDPI AG
2019-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/10/1985 |
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| author | Yongbin Wu Donghui Zhang Liansong Xiong Sue Wang Zhao Xu Yi Zhang |
| author_facet | Yongbin Wu Donghui Zhang Liansong Xiong Sue Wang Zhao Xu Yi Zhang |
| author_sort | Yongbin Wu |
| collection | DOAJ |
| description | Inertia effect and damping capacity, which are the basic characteristics of traditional power systems, are critical to grid frequency stability. However, the inertia and damping characteristics of grid-tied photovoltaic generation systems (GPVGS), which may affect the frequency stability of the grid with high proportional GPVGS, are not yet clear. Therefore, this paper takes the GPVGS based on droop control as the research object. Focusing on the DC voltage control (DVC) timescale dynamics, the mathematical model of the GPVGS is firstly established. Secondly, the electrical torque analysis method is used to analyze the influence law of inertia, damping and synchronization characteristics from the physical mechanism perspective. The research finds that the equivalent inertia, damping and synchronization coefficient of the system are determined by the control parameters, structural parameters and steady-state operating point parameters. Changing the control parameters is the simplest and most flexible way to influence the inertia, damping and synchronization ability of the system. The system inertia is influenced by the DC voltage outer loop proportional coefficient <i>K</i><sub>p</sub> and enhanced with the increase of <i>K</i><sub>p</sub>. The damping characteristic of the system is affected by the droop coefficient <i>D</i><sub>p</sub> and weakened with the increase of <i>D</i><sub>p</sub>. The synchronization effect is only controlled by DC voltage outer loop integral coefficient <i>K</i><sub>i</sub> and enhanced with the increase of <i>K</i><sub>i</sub>. In addition, the system dynamic is also affected by the structural parameters such as line impedance <i>X</i>, DC bus capacitance <i>C</i>, and steady-state operating point parameters such as the AC or DC bus voltage level of the system and steady-state operating power (power angle). Finally, the correctness of the above analysis are verified by the simulation and experimental results. |
| first_indexed | 2024-04-13T08:41:10Z |
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| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T08:41:10Z |
| publishDate | 2019-05-01 |
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| series | Energies |
| spelling | doaj.art-6c8bdd6f325748b182bf34f8301282952022-12-22T02:53:54ZengMDPI AGEnergies1996-10732019-05-011210198510.3390/en12101985en12101985Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop ControlYongbin Wu0Donghui Zhang1Liansong Xiong2Sue Wang3Zhao Xu4Yi Zhang5School of Electrical and Control Engineering, Shaanxi University of Science & Technology, Xi’an 710021, ChinaSchool of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412008, ChinaDepartment of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong 999077, ChinaSchool of Electrical and Control Engineering, Shaanxi University of Science & Technology, Xi’an 710021, ChinaDepartment of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong 999077, ChinaSchool of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaInertia effect and damping capacity, which are the basic characteristics of traditional power systems, are critical to grid frequency stability. However, the inertia and damping characteristics of grid-tied photovoltaic generation systems (GPVGS), which may affect the frequency stability of the grid with high proportional GPVGS, are not yet clear. Therefore, this paper takes the GPVGS based on droop control as the research object. Focusing on the DC voltage control (DVC) timescale dynamics, the mathematical model of the GPVGS is firstly established. Secondly, the electrical torque analysis method is used to analyze the influence law of inertia, damping and synchronization characteristics from the physical mechanism perspective. The research finds that the equivalent inertia, damping and synchronization coefficient of the system are determined by the control parameters, structural parameters and steady-state operating point parameters. Changing the control parameters is the simplest and most flexible way to influence the inertia, damping and synchronization ability of the system. The system inertia is influenced by the DC voltage outer loop proportional coefficient <i>K</i><sub>p</sub> and enhanced with the increase of <i>K</i><sub>p</sub>. The damping characteristic of the system is affected by the droop coefficient <i>D</i><sub>p</sub> and weakened with the increase of <i>D</i><sub>p</sub>. The synchronization effect is only controlled by DC voltage outer loop integral coefficient <i>K</i><sub>i</sub> and enhanced with the increase of <i>K</i><sub>i</sub>. In addition, the system dynamic is also affected by the structural parameters such as line impedance <i>X</i>, DC bus capacitance <i>C</i>, and steady-state operating point parameters such as the AC or DC bus voltage level of the system and steady-state operating power (power angle). Finally, the correctness of the above analysis are verified by the simulation and experimental results.https://www.mdpi.com/1996-1073/12/10/1985grid-tied photovoltaic generation systemdeloading maximum power point trackingDC voltage control timescaleelectrical torque analysis methodinertia and damping characteristics |
| spellingShingle | Yongbin Wu Donghui Zhang Liansong Xiong Sue Wang Zhao Xu Yi Zhang Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control Energies grid-tied photovoltaic generation system deloading maximum power point tracking DC voltage control timescale electrical torque analysis method inertia and damping characteristics |
| title | Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control |
| title_full | Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control |
| title_fullStr | Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control |
| title_full_unstemmed | Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control |
| title_short | Modeling and Mechanism Investigation of Inertia and Damping Issues for Grid-Tied PV Generation Systems with Droop Control |
| title_sort | modeling and mechanism investigation of inertia and damping issues for grid tied pv generation systems with droop control |
| topic | grid-tied photovoltaic generation system deloading maximum power point tracking DC voltage control timescale electrical torque analysis method inertia and damping characteristics |
| url | https://www.mdpi.com/1996-1073/12/10/1985 |
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