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2 Przegląd Elektrotechniczny

2 2015

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Power Flow Control in the Converters Interconnecting AC-DC Meshed Systems

Jardini J. A, Sousa T, Romero R. A, Rider M. J, Horita M. A. B, Bassini M, Cavalheiro M. R

Przegląd Elektrotechniczny

2015

R. 91, nr 1

46-49

DC grids are being strongly considered as a technology to be used for future expansions of the transmission system. Voltage sourced converters (VSC) are the key equipment considered for AC/DC interconnections. However the flow from DC to AC system has to be properly set as many alternatives exists. In this article, an Optimal Power Flow (OPF) to control the flow of power in the converters interconnecting AC-DC systems is presented. The proposed OPF solution technique was tested using the CIGRE B4 DC Grid Test System.

W artykule opisano sterowanie przepływem mocy w przekształtniku łączącym sieci DC-AC. Optymalny przepływ mocy OPF był testowany w systemie sieciowym CIGRE B4 DC.

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.