| 摘要 |
PURPOSE:To improve safety and reliability by a method wherein reactive power output from an inverter is detected, a phase-difference measured value based on the detection and a phase-difference command value transmitted over the inverter are compared, the single operation of the inverter after the generation of system service interruption is detected and the single operation is stopped. CONSTITUTION:The phase-difference measured value of output currents to reactive power, output voltage, actually output from an inverter 12 is computed by a single-operation decision circuit 22. On the other hand, a phase-difference command value transmitted over the inverter 12 is transmitted over the single- operation decision circuit 22 from a current control circuit 20. The single- operation decision circuit 22 compares the phase-difference measured value and the phase-difference command value, decides the inverter 12 as single operation when the absolute value of the difference of the phase-difference measured value and the phase-difference command value is larger than a tolerance, and stops the inverter 12. Accordingly, safety and reliability are improved. |
