Power control of low frequency AC transmission system using cycloconverters with virtual synchronous generator control

Achara, Pichetjamroen; Ise, Toshifumi

doi:10.1109/iecon.2015.7392503

Cited by 4 publications

(2 citation statements)

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“…The increase of power capacity and transmission distance compared to the conventional (50 or 60 Hz) transmission ac system can be mentioned as its main advantages [2]. Protection of low frequency side faults is easier than for the DC side faults of VSC-HVDC due to their zero crossing point; also the power flow direction can be changed by the phase control of the voltage on the low frequency side [3], and existing circuit breakers can be used in this system although the interruption current is decreased to around half of 60 Hz [4].…”

Section: Multi-terminal Applicationmentioning

confidence: 99%

“…The concept of control scheme is shown in Figure 5. To avoid this control complexity, the LCC-MTLF can be employed by applying the power synchronization control which make each terminal has a dynamic response similar to a synchronous machine which is virtual synchronous generator (VSG) [3,9]. The concept of control scheme is shown in Figure 5.…”

Section: Synchronizationmentioning

confidence: 99%

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A Proposal on Low Frequency AC Transmission as a Multi-Terminal Transmission System

Achara¹,

Ise²

2016

Energies

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This paper is focused on the discussion and comparison of characteristics and behavior of three low frequency ac (LFAC) transmission system configurations operating under the same control scheme and conditions to identify the most promising operation system for LFAC. Merits of LFAC over high voltage direct current (HVDC) are mentioned first. By changing power flow direction without auxiliary switches in multi-terminal application and easiness of short circuit protection are explained. The three configurations of LFACs are described and applied by the control scheme with the aid of the tool of the PSCAD/EMTDC software to consider the behavior of each LFAC system on line frequency and low frequency sides. For two-phase system, no fluctuation occurs on the line frequency side, which is the advantage over single-phase system. Furthermore, current rating on thyristor devices during operation and number of devices that used in each type of LFAC are calculated and compared. These results can lead to determine the most suitable transmission system for the LFAC system operation.

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Section: Multi-terminal Applicationmentioning

confidence: 99%

Section: Synchronizationmentioning

confidence: 99%