| 摘要 |
PROBLEM TO BE SOLVED: To effectively utilize phase modifying equipment and protect a transformer for linkage by switching through a control switching circuit, so that the transformer for linkage will control the phase modifying equipment in overloaded state from a phase modification controller. SOLUTION: A phase modifying equipment 16 for reactive power compensation is placed between a transformer 14 for alternating current-to-direct current conversion and a transformer 15 for linkage of direct-current transmission equipment, and the phase modifying equipment 16 for reactive power compensation supplies reactive power to a voltage which is increased at the transformer 14 for alternating the current- to-direct current conversion to stabilize the supply of voltage. The calculation control circuit 20 of a phase modification controller 18 is fed with a power setting value signal 19 from a power set value circuit 17 during operation of an alternating current- to-direct current converter for performing control arithmetic operation, and outputs the result of the control arithmetic operation as 'on'/'off' operation commanding signal 21 to the phase modifying equipment 16 for reactive power compensation. When the transformer 15 for linkage is overloaded, an auxiliary relay is operated to change the control route. As a result, the effective utilization of the phase modifying equipment and the protection of the transformer device for linkage are made feasible. |
