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AC transmission system with reactance compensation
| Details |
Inventors: Mizutani, Mami; Monden, Yukitaka; Shigeta, Masaaki; Tanaka, Shigeru; Yamamoto, Hajime; Uchino, Hiroshi;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Berhane; Adolf Deneke
Assistant Examiner:
Attorney, Agent or Firm: Foley & Lardner
A series compensation generator SCG is installed in a transmission line that links various substations SS and the transmission capability of the system as a whole can be increased by regulating the equivalent reactance of the transmission line. Series compensation generator SCG generates a voltage of which the phase angle is shifted substantially 90.degree. in relation to the current flowing in the transmission line, and it also generates a voltage that compensates the voltage drop due to the equivalent reactance. Also, when an electrical fluctuation phenomenon (power oscillation) occurs in the transmission line, it is possible speedily to suppress the power oscillation by detecting the power fluctuation of the transmission line and controlling the compensating voltage of series compensation generator SCG so that it suppresses that power fluctuation. |
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DETAILED DESCRIPTION Accordingly, one object of the present invention is to provide a novel AC transmission system that can make effective use of existing AC transmission lines, can cancel effects due to reactance, and can transmit over long distances by increasing the transmission capabilities of the transmission lines.
Also, one object of the present invention is to provide an AC transmission system that can make effective use of existing transmission lines (including distribution lines), can cancel the effects due to reactance, can increase the transmission capabilities of transmission lines or distribution lines, and can transmit over long distances.
To achieve the above objects, in a power system in which transmission is via multiple substations, the present invention is an AC transmission system that provides at least one series compensation generator that generates a compensating voltage for regulating the equivalent reactance of power lines between those substations and inhibiting power oscillation.
With AC transmission, the performance of long distance transmission via multiple substations, making use of existing transmission lines, can be considered.
The transmission capability of the system as a whole can be increased by installing multiple series compensation generators on the transmission lines that connect the various substations, and regulating the equivalent reactance of the transmission lines.
A series compensation generator generates a voltage with its phase shifted by an electrical angle of approximately 90.
degree.
to the current flowing in a transmission line.
Thus, it generates a voltage that compensates the voltage drop due to the equivalent reactance.
Provided the series compensation generator generates a compensating voltage such that it will entirely cancel the voltage drop due to the inductance of the transmission line, the equivalent reactance of the transmission line will become zero.
Also, even if the reactance is not entirely cancelled, by reducing the inductance, the transmission capability of the transmission line can be markedly improved
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Electrical and Wave 
