Meidensha Corporation

The Tokyo Electric Power Company, Incorporated

Junichi Shimomura

Kenichi Suzuki

Satoru Ohishi

[Task] In a power conversion system, a variation in PCS alternating current voltage is suppressed during a change operation to a self-contained run according to an instantaneous voltage drop-service interruption. [Means for solving the task] During an ordinary system voltage stabilization, with change switchchanged to the output side of APR control circuitand change switchchanged to the output side of charge/discharge run PWM command value preparing section, the power conversion system is run in a charge/discharge run mode. If the instantaneous voltage drop or the service interruption occurs, change switchis changed to the output side of the self-contained run change prior current command value preparing sectionand the constant current discharge run is carried out in which the electric power is discharged for a predetermined time duration in response to the current command value of the self-contained run change prior current command value preparing section. Thus, after a predetermined time has elapsed, change switchis changed to the output side of the self-contained run PWM command value preparing sectionto perform the self-contained run. At this time, the variation in PCS alternating current voltage in the power conversion system is suppressed.

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Tokyo, Japan

Junichi Shimomura