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2 2015

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Overvoltage Assessment of Point-to-Point VSC-Based HVDC Systems

Jardini J. A., Vasquez-Arnez R. L., Bassini M. T., Horita M. A. B., Saiki G. Y., Cavalheiro M. R.

Przegląd Elektrotechniczny

2015

R. 91, nr 8

105--112

Artykuł przedstawia rezultaty symulacji przepięć występujących w sieci DC bazującej na wykorzystaniu VSC (voltage source converters). Układ VSC wykorzystuje technikę MMC (modular multi-level converter). Rozpatrzono też wpływ sąsziadującej z siecią DC sieci AC.

The application of voltage source converters (VSCs) into medium- and high-power transmission is currently attracting increased attention. In view of this increased attention, this article provides the simulation results of the overvoltages produced by faults occurring in the DC line of a point-to-point VSC-based HVDC system as well as in a neighbouring AC line system. The VSC converters considered here use the MMC (modular multi-level converter) technique to generate the voltage waveform. For pole-to-ground faults occurring in the DC link of a symmetrical monopole system, significantly high overvoltages may arise on the sound pole. This condition is of concern, mainly during the planning stage of the VSC-HVDC project, as it may require the installation of surge arresters with a good performance and/or also additional insulation of the line. In addition, unless the faults occurring on the DC link are quickly removed, sustained overvoltages can threaten the normal operation of the surge arresters installed on the DC side of both sound and faulty poles. Faults and other events in the AC system (near the DC link) may lead to sustained overvoltages that should also be examined regarding the response of the surge arresters.

Dynamic Performance of Line Commutated Converter-Based Multiterminal HVDC Systems

Vasquez-Arnez R. L., Jardini J. A., Bassini M. T.

Przegląd Elektrotechniczny

2015

R. 91, nr 9

247-253

In this article, the modelling and simulation results related to the dynamic performance of a multiterminal HVDC system, based on Line Commutated Converters (LCC), is presented. The four-converter HVDC system simulated operates at 500 kV. In order to evaluate its behaviour in a more realistic way, the multiterminal HVDC system was embedded into an equivalent ac network that resembles an existing high voltage system. A model to represent the ac generator dynamics (speed regulator and voltage controller), which interacts with the DC system, is also presented in the paper. The converter blocking condition, which is another HVDC operative requirement, was also simulated. From the dynamic response of the converters and ac sources obtained, it can be stated that the LCC-based multiterminal HVDC system can be a good alternative to be considered while analysing issues like planning, expansion and transmission of bulk power.

W artykule zaprezentowano modelowanie i symulację właściwości dynamicznych systemu HVDC bazującego na układzie Line Commutated Converter LCC. W celu oceny właściwości w bardziej realistycvznych warunkach system HVDC został wbudowany w odpowiednią sieć AC co przypomina istniejące systemy wysokiego napięcia. Na podstawie badań stwierdzono że wieloterminalowy system HVDC może być dobra alternatywą dla istniejących systemów.