Abstract
The distributed power generation system simulating the characteristics of synchronous generators is grid-friendly to the large power grid. However, a large dash current may be generated at the instant the virtual synchronous generator (VSG) is connected to the grid. This paper proposes a pre-synchronization unit based on the virtual power and the secondary frequency and voltage regulation to achieve seamless transform between the off-disconnection and grid-connection of VSG. Accordingly, the influence of inertia, damping and droop coefficients on the frequency regulation characteristics is analyzed in detail. Simulation and experimental results show that the proposed pre-synchronization control is able to achieve seamless transform between different VSG modes, which is simpler than the conventional pre-synchronization control, while having a good active and reactive power tracking performance.
| Original language | English |
|---|---|
| Pages (from-to) | 124-129 and 178 |
| Journal | Dianli Xitong Zidonghua/Automation of Electric Power Systems |
| Volume | 40 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 25 Jun 2016 |
| Externally published | Yes |
Keywords
- Grid-connected inverter
- Pre-synchronization
- Secondary frequency regulation
- Secondary voltage regulation
- Virtual power
- Virtual synchronous generator (VSG)