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This paper proposes a novel transmission concept of Low Frequency AC (LFAC) transmission system, which is suitable for a long distance and high power cable transmission. An HVdc system is conventionally adopted for a long distance power cable transmission by Oil Filled or Solid cables. An XLPE cable shows preferable performance as a power cable in the conventional AC system for relatively short distance trans mission. But it has difficulty of operation in an HVdc system, for space charges accumulate in the insulating dielectrics under high dc electric field stress, and which may cause breakdown. A low frequency ac system can avoid this difficulty as a conventional utility frequency ac system does. In the proposed LFAC system, frequency converters are installed at the sending and receiving terminals. Then, the presened system is ex pected to control the power flow of the interconnection as an HVdc does. This paper shows the advantages and disadvantages of the presented LFAC system and its basic control strategy. They are confirmed through digital computer simulations using a simplified model.

Proposition of a Novel Low Frequency AC Power Cable Transmission System