Abstract
High voltage DC (HVDC) transmission based on modular multilevel converter (MMC) is a new type of HVDC transmission technology based on voltage source converter (VSC). Taking mathematical relationship of the exchanged power between the AC system and the converter station into account, the influence of AC system strength on steady state characteristics of MMC-HVDC is analyzed by graphic method, meanwhile the transient characteristics of HVDC system connected to strong/weak AC system are analyzed while the setting values of the different converter control modes are changed. Analysis results show that the strength of AC system as well as the influence of converter control modes on operating characteristics of MMC-HVDC system can be reflected by the size of power circle and its relative position visually. The correctness of above-mentioned conclusion is verified by the results of the simulation based on PSCAD electromagnetic transient model.
| Original language | English |
|---|---|
| Pages (from-to) | 17-24 |
| Number of pages | 8 |
| Journal | Dianwang Jishu/Power System Technology |
| Volume | 35 |
| Issue number | 2 |
| State | Published - Feb 2011 |
Keywords
- AC system strength
- HVDC power transmission
- Modular multilevel converter (MMC)
- Operational characteristics
- Power circle