Journal article
Interaction of Droop Control Structures and its Inherent Effect on the Power Transfer Limits in Multi-terminal VSC-HVDC
Department of Electrical Engineering, Technical University of Denmark1
Center for Electric Power and Energy, Centers, Technical University of Denmark2
Electric Power Systems, Center for Electric Power and Energy, Centers, Technical University of Denmark3
Norwegian University of Science and Technology4
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.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2016 |
| Pages: | 182-192 |
| ISSN: | 19374208 and 08858977 |
| Types: | Journal article |
| DOI: | 10.1109/TPWRD.2016.2600028 |
| ORCIDs: | Thams, Florian |
AC-DC power converters Control system analysis HVDC transmission Power system stability Power transmission Stability Stability analysis State-space methods
HVDC power convertors Mathematical model Phase locked loops Power conversion Voltage control active power transfer capability ac–dc power converters control system analysis dc voltage droop controllers droop control structures multiterminal HVDC systems multiterminal VSC-HVDC power transfer limits power transmission stability stability analysis state-space methods three-terminal HVDC VSC-based grid voltage control voltage regulators
