Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale
The DC-link voltage control (DVC) timescale (i.e., the frequency dynamics covering converter outer controls) instabilities in wind generation have gained increased attention recently. This paper presents DVC timescale modeling and stability analysis for multi doubly-fed induction generators (DFIGs)...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-07-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/13/14/3689 |
| _version_ | 1797562078054055936 |
|---|---|
| author | Dong Wang Houquan Chen Yunhui Huang Xiangtian Deng Guorong Zhu |
| author_facet | Dong Wang Houquan Chen Yunhui Huang Xiangtian Deng Guorong Zhu |
| author_sort | Dong Wang |
| collection | DOAJ |
| description | The DC-link voltage control (DVC) timescale (i.e., the frequency dynamics covering converter outer controls) instabilities in wind generation have gained increased attention recently. This paper presents DVC timescale modeling and stability analysis for multi doubly-fed induction generators (DFIGs) connected to weak AC grids. A reduced-order, small-signal model of a grid-tied multi-DFIG system, designed for DVC dynamics analysis, is firstly proposed. The model allows for the dynamic interactions among the DC-link voltage control, active power control (APC), terminal voltage control (TVC) and phase-locked loop (PLL). Eigenvalue and participation factor analyses are conducted to explore the potential instabilities and correlated critical factors for such a multi-machine system. The sensitivity studies find that instability can occur at high levels of power generations or low short-circuit ratio (SCR) conditions. In addition, the dominant mode is identified to be highly related to the PLL, and its modal damping is decreased when the bandwidths of PLLs in different generators are close. Detailed model-based time domain simulations verified the analysis above. |
| first_indexed | 2024-03-10T18:24:30Z |
| format | Article |
| id | doaj.art-33c0602919be4e86a6e38717264c900e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T18:24:30Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-33c0602919be4e86a6e38717264c900e2023-11-20T07:08:00ZengMDPI AGEnergies1996-10732020-07-011314368910.3390/en13143689Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control TimescaleDong Wang0Houquan Chen1Yunhui Huang2Xiangtian Deng3Guorong Zhu4Department of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, ChinaDepartment of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, ChinaDepartment of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, ChinaDepartment of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, ChinaDepartment of Electrical Engineering, School of Automation, Wuhan University of Technology, Wuhan 430070, ChinaThe DC-link voltage control (DVC) timescale (i.e., the frequency dynamics covering converter outer controls) instabilities in wind generation have gained increased attention recently. This paper presents DVC timescale modeling and stability analysis for multi doubly-fed induction generators (DFIGs) connected to weak AC grids. A reduced-order, small-signal model of a grid-tied multi-DFIG system, designed for DVC dynamics analysis, is firstly proposed. The model allows for the dynamic interactions among the DC-link voltage control, active power control (APC), terminal voltage control (TVC) and phase-locked loop (PLL). Eigenvalue and participation factor analyses are conducted to explore the potential instabilities and correlated critical factors for such a multi-machine system. The sensitivity studies find that instability can occur at high levels of power generations or low short-circuit ratio (SCR) conditions. In addition, the dominant mode is identified to be highly related to the PLL, and its modal damping is decreased when the bandwidths of PLLs in different generators are close. Detailed model-based time domain simulations verified the analysis above.https://www.mdpi.com/1996-1073/13/14/3689DFIGweak gridDC-link voltage control timescaleeigenvalue analysisPLL |
| spellingShingle | Dong Wang Houquan Chen Yunhui Huang Xiangtian Deng Guorong Zhu Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale Energies DFIG weak grid DC-link voltage control timescale eigenvalue analysis PLL |
| title | Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale |
| title_full | Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale |
| title_fullStr | Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale |
| title_full_unstemmed | Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale |
| title_short | Modeling and Stability Analysis of Weak-Grid Tied Multi-DFIGs in DC-Link Voltage Control Timescale |
| title_sort | modeling and stability analysis of weak grid tied multi dfigs in dc link voltage control timescale |
| topic | DFIG weak grid DC-link voltage control timescale eigenvalue analysis PLL |
| url | https://www.mdpi.com/1996-1073/13/14/3689 |
| work_keys_str_mv | AT dongwang modelingandstabilityanalysisofweakgridtiedmultidfigsindclinkvoltagecontroltimescale AT houquanchen modelingandstabilityanalysisofweakgridtiedmultidfigsindclinkvoltagecontroltimescale AT yunhuihuang modelingandstabilityanalysisofweakgridtiedmultidfigsindclinkvoltagecontroltimescale AT xiangtiandeng modelingandstabilityanalysisofweakgridtiedmultidfigsindclinkvoltagecontroltimescale AT guorongzhu modelingandstabilityanalysisofweakgridtiedmultidfigsindclinkvoltagecontroltimescale |