Abstract
An increasing number of single-phase loads are being connected to the Danish transmission grid due to electrification of the Danish railway, which consequently results in the need to estimate the effects of the introduced voltage unbalance. The tendency of having more power generated by units mechanically decoupled from the grid, which reduces the short-circuit power of the system, makes the grid more vulnerable to unbalanced loads. High-voltage direct current line commutated converters (HVDC-LCCs) can be negatively affected by voltage unbalance, in the form of commutation failure. The impact of the voltage unbalance on a HVDC-LCC is tested through electromagnetic transient simulations in DIgSILENT PowerFactory, where variations in the voltage unbalance are implemented as steps and approximated ramps. The worst point of wave to energise the single-phase loads, corresponding to the trains, is investigated and implemented in the simulation. The simulations show that if the HVDC LCC is operating at the maximum firing angle, steps of voltage unbalance can cause commutation failures in the HVDC-LCC. For the more realistic electric train scenario, where the voltage unbalance is simulated as an approximative ramp, no commutation failures were observed due to the control system of the HVDC-LCC’s ability to decrease the firing angle.
Originalsprog | Engelsk |
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Titel | Proceedings of 2018 53rd International Universities' Power Engineering Conference (UPEC) |
Antal sider | 5 |
Forlag | IEEE Press |
Publikationsdato | sep. 2018 |
Sider | 1-5 |
ISBN (Trykt) | 978-1-5386-2911-6 |
ISBN (Elektronisk) | 978-1-5386-2910-9 |
DOI | |
Status | Udgivet - sep. 2018 |
Begivenhed | 2018 53rd International Universities Power Engineering Conference - Glasgow, Storbritannien Varighed: 4 sep. 2018 → 7 sep. 2018 |
Konference
Konference | 2018 53rd International Universities Power Engineering Conference |
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Land/Område | Storbritannien |
By | Glasgow |
Periode | 04/09/2018 → 07/09/2018 |