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| Content Provider | IET Digital Library |
|---|---|
| Author | Yang, Ling Chen, Yandong Luo, An Chen, Zhiyong Zhou, Leming Zhou, Xiaoping Wu, Wenhua Tan, Wenjuan Guerrero, Josep M. |
| Abstract | For three-phase LCL-type inverter connected to weak grid, the bandwidth and dynamics of phase-locked loop (PLL) directly affect small-signal perturbation modelling, which causes the control dq frame of PLL being no longer aligned with the system dq frame of weak grid. Thus, considering the effect of PLL, a small-signal perturbation admittance model is firstly built. Secondly, by the rotating matrix, variables in the system dq frame are transformed into the control dq frame. Then, the interaction between two dq frames is established based on an admittance model in consideration of the PLL, and the inverter output admittance is obtained. Finally, the effect of PLL, grid impedance and LCL-type filter parameters on system stability are analysed. As a conclusion, with an increase in PLL bandwidth and grid impedance, the system stability gradually is decreased, even resulting in the system instability. In addition, the larger the active damping coefficient is, the better the system stability is. While, the increase of filter capacitance and grid-side inductance leads to the decrease of system stability. The conclusions have certain guiding significance and reference value for the design and safe operation of three-phase LCL-type grid-connected inverter. The simulation and experiment verify the validity of theoretical analysis. |
| Starting Page | 86 |
| Ending Page | 93 |
| Page Count | 8 |
| ISSN | 17521416 |
| Volume Number | 13 |
| e-ISSN | 17521424 |
| Issue Number | Issue 1, Jan (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rpg/13/1 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2018.0072 |
| Journal | IET Renewable Power Generation |
| Publisher Date | 2018-05-08 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Active Damping Coefficient Admittance Model Algebra Control Dq Frame Demodulator Discriminators And Mixers Duty Ratio Filter Capacitance Current Grid Current Grid Impedance Grid-side Inductance Inverter Output Admittance Invertors LCL-type Filter Parameter Matrix Algebra Modulator Phase Locked Loop PLL Bandwidth Point-of-common Coupling Voltage Rotating Matrix Small-signal Perturbation Modelling Stability Analysis System Dq Frame Three-phase LCL-type Grid-connected Inverter Weak Grid |
| Content Type | Text |
| Resource Type | Article |
| Subject | Renewable Energy, Sustainability and the Environment |
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