Shop : Rezensionsexemplar
Shop
Rezensionsexemplar
48,80 €ISBN 978-3-8440-4986-2Paperback176 Seiten98 Abbildungen251 g21 x 14,8 cmEnglischDissertation
Januar 2017
Stefan P. Engel
Thyristor-Based High-Power On-Load Tap Changers
Control under Harsh Load Conditions
The volatile nature of renewable power sources leads to increased voltage fluctuations in the medium-voltage and low-voltage ac grids to which they are connected. Mechanical on-load tap changers are widely used to keep the voltage in these grids within prescribed limits. However, mechanical on-load tap changers are not designed for the high number of switching cycles that are required in grids that have high capacity on volatile sources. Their contacts can only handle a limited number of switching actions during their lifetime.
This thesis investigates fully electronic thyristor-based on-load tap changers that are capable of switching extremely fast and that exhibit virtually no wear due to switching actions. For the control of the commutation process a robust control is developed. The new control scheme uses separate gate trigger signals for each thyristor of a bidirectional thyristor pair. Thereby, safe commutation at highly disturbed load currents is achieved. Undesired short-circuits from tap to tap during commutation are avoided effectively.
A detailed simulation model of transformer and tap changer is synthesized to comprehensively test the developed control under highly disturbed load conditions. The model is verified using a low-power experimental setup of a 9-step on-load tap changer prototype. Basic switching tests are performed on a 27-step on-load tap changer prototype with a nominal regulating range of ±7600 V and a current capability of 950 A.
This thesis investigates fully electronic thyristor-based on-load tap changers that are capable of switching extremely fast and that exhibit virtually no wear due to switching actions. For the control of the commutation process a robust control is developed. The new control scheme uses separate gate trigger signals for each thyristor of a bidirectional thyristor pair. Thereby, safe commutation at highly disturbed load currents is achieved. Undesired short-circuits from tap to tap during commutation are avoided effectively.
A detailed simulation model of transformer and tap changer is synthesized to comprehensively test the developed control under highly disturbed load conditions. The model is verified using a low-power experimental setup of a 9-step on-load tap changer prototype. Basic switching tests are performed on a 27-step on-load tap changer prototype with a nominal regulating range of ±7600 V and a current capability of 950 A.
Schlagwörter: Thyristors; On-Load Tap Changer; Commutation; Control
Shaker Verlag GmbH
Am Langen Graben 15a
52353 Düren
Am Langen Graben 15a
52353 Düren
Mo. - Do. 8:00 Uhr bis 16:00 Uhr
Fr. 8:00 Uhr bis 15:00 Uhr
Fr. 8:00 Uhr bis 15:00 Uhr
Kontaktieren Sie uns. Wir helfen Ihnen gerne weiter.
