Abstract
Future multi-terminal HVDC systems are expected to utilize dc voltage droop controllers and several control structures have been proposed in literature. This paper proposes a methodology to analyse the impact of various types of droop control structures using small-signal stability analysis considering all possible combinations of droop gains. The different control structures are evaluated by the active power transfer capability as a function of the droop gains, considering various possible stability margins. This reveals the flexibility and robustness against active power flow variations, due to disturbances for all the implementations. A case study analyzing a three terminal HVDC VSC-based grid with eight different kinds of droop control schemes points out that three control structures outperform the remaining ones. Additionally, a multi-vendor case is considered where the most beneficial combinations of control structures has been combined in order to find the best performing combination.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Power Delivery |
| Volume | 32 |
| Issue number | 1 |
| Pages (from-to) | 182 - 192 |
| ISSN | 0885-8977 |
| DOIs | |
| Publication status | Published - 2016 |
Bibliographical note
© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Keywords
- Power system stability
- Power transmission
- Stability
- HVDC transmission
- AC-DC power converters
- Stability analysis
- Control system analysis
- State-space methods