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| Content Provider | IET Digital Library |
|---|---|
| Author | Zhang, Chen Cai, Xu Li, Zheng Rygg, Atle Molinas, Marta |
| Abstract | Voltage source converters (VSCs) play an important role in the power conversion of renewable power generation (RPG) systems. Conventional power systems are considerably affected by power electronic devices in systems with a high percentage of RPG. Various abnormal interactions in the form of oscillations between VSCs and grid have been reported, whereas the mechanism at the core is still lacking understanding. In this study, the properties of interactions between the VSC and grid are investigated, and through an analytical model the mechanisms of electrical oscillations are revealed. First, a simple resistance–inductance–capacitance (RLC) equivalent to the small-signal model of VSC–grid system was derived based on the knowledge of virtual passive element effects of VSC. Then, an intrinsic oscillatory point in the RLC circuit was identified, the damping characteristics of the current controller and phase-locked-loop (PLL) at this point were analysed. Subsequently, a critical stability criterion for the determination of PLL bandwidth that may trigger oscillations was established. For the improvement of the overall damping, a VSC stabiliser was proposed. Finally, the mechanism analysis and analytical criteria were verified by time-domain simulations in PSCAD/EMTDC. |
| Starting Page | 894 |
| Ending Page | 902 |
| Page Count | 9 |
| ISSN | 17554535 |
| Volume Number | 10 |
| e-ISSN | 17554543 |
| Issue Number | Issue 8, Jun (2017) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-pel/10/8 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0475 |
| Journal | IET Power Electronics |
| Publisher Date | 2017-02-28 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Control of Electric Power System Critical Stability Criterion Current Control Current Controller Damping Damping Characteristic Demodulator Discriminators And Mixers Dynamic Interactions Electric Current Control Electrical Oscillation Mathematical Analysis Modulator Phase Locked Loop Physical Interpretation PLL Bandwidth Determination Power Conversion Power Converter Power Electronic Device Power Generation Control Power Grid Power Supplies to Apparatus Power System Control Power System Simulation Power System Stability PSCAD-EMTDC Simulations Renewable Power Generation Resistance-inductance-capacitance Circuit RLC Circuit RPG System Small-signal Model Stability Control Stability Criteria Stability in Control Theory Time Domain Analysis Time-domain Simulation Virtual Passive Element Effect Voltage Source Converter Voltage-source Converter VSC Stabiliser VSC–grid System |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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