POWER PHASE MODIFYING EQUIPMENT AND TRANSMISSION SYSTEM APPLYING THE POWER PHASE MODIFYING EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To obtain a power phase modifying equipment provided with a series compensation unit having an efficient initial charging function and a transmission system applied with a power phase modifying equipment. SOLUTION: The power phase modifying equipment including at least one phase modifying unit 13 equipped with a transformerless reactive power series compensation unit having at least one switch and comprising a DC capacitor 8 and a single phase inverter 7 being connected in series with transmission lines 2a, 2b is provided with means PCM for initially charging the DC capacitor 8 of at least one phase modifying unit 13 when it is decoupled from the transmission lines 2a, 2b. The initial charging means PCM comprises an AC switch, and an AC switch controller for turning the AC switch off for some time interval after zero-cross of system current.