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| Content Provider | IET Digital Library |
|---|---|
| Author | Li, Haoran Zhao, Jinbin Yang, Xuhong |
| Abstract | Impedance-based analysis is widely used to study the grid-connected inverter system in a weak grid. The advantage of the analysis is that without knowing the accurate parameters of an inverter, its equivalent output impedance can be obtained by specific methods (e.g. the specific harmonic injection method) to investigate the system's stability. However, using Z grid/Z inv to represent the phase margin (Pm) of the system is inaccurate. A more complete mathematical model of the grid-connected inverter system in a weak grid is proposed, which contains the grid impedance and the load at the point of common coupling being neglected in the traditional model. Then, the error of the Pm from the impedance-based analysis is proved in detail in theory which indicates that the Pm of the analysis can hardly reflect the real state of the grid-connected system. Simulations validate the theoretical analysis. |
| Starting Page | 1922 |
| Ending Page | 1924 |
| Page Count | 3 |
| ISSN | 00135194 |
| Volume Number | 51 |
| e-ISSN | 1350911X |
| Issue Number | Issue 23, Nov (2015) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/el/51/23 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/el.2015.2059 |
| Journal | Electronics Letters |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Grid Impedance Grid-connected Inverter System Impedance-based Analysis Invertors Mathematical Analysis Mathematical Model Point of Common Coupling Power Grid Weak Grid |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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