Nissin Electric Co., Ltd.

The Kansai Electric Power Co., Inc.

Tokuo Emura

Kenji Murata

Shoji Nishimura

Yoshifumi Minowa

Masakuni Asano

Noriaki Tokuda

Susumu Ito

Kazuo Sonohara

Kyoji Ishizu

Yoshihiro Hada

A power fluctuation monitoring unit which monitors and detects the power fluctuation at a receiving point by means of the measurement results of the voltage at injection point of an intermediate-order harmonic current and the current at incoming line 10, a power compensation unit which forms the compensation power injection signal for canceling out the power fluctuation based on the detection results of the power fluctuation, and an inverter device which is driven and controlled by the signal resulting from the addition of the intermediate-order harmonic current injection signal and the compensation power injection signal and injects the intermediate-order harmonic current and the compensation power into the injection point, are equipped.

Isolated operation prevention device for distributed power supply and interharmonic detection method

A method of locating a fault point in a parallel two-circuit transmission line in an n-terminal system. When a single fault occurs at one place in one circuit of the transmission line and when a multiple fault occurs at the same place in the two circuits, a distance to the fault may be calculated by the method of this invention. The method comprises the steps of transforming the transmission line into a T three-terminal parallel two-circuit transmission line circuit having three branches, calculating a value representing a length of one of the three branches on the basis of differential currents flowing into the branch points of the transmission line, determining if that value represents the distance from a terminal connected to the branch point to the fault point, employing the value as the distance to the fault point if the value represents such a distance, repeating the value calculation and determination for the other two branches if the value does not represent the distance to the fault, determining a next branch point for which to perform equivalent transformation with respect to, and repeating the previous steps until the fault is found.

Fault location method for a parallel two-circuit transmission line with

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Kyoto, Japan

Tokuo Emura