SINGLE OPERATION DETECTING APPARATUS FOR DETECTING A SYNCHRONOUS GENERATOR OF A DISTRIBUTED POWER SUPPLY

摘要

A single operation detecting apparatus for detecting that a synchronous generator of a distributed power supply is switched to single operation from cooperation of the distributed power supply with another power system. It includes a frequency detector connected to a line system of a customer, reactive power regulating equipment connected to the output terminal of the synchronous generator, a fluctuation signal generator for providing periodic small fluctuations to a reactive power setter of the reactive power regulating equipment, and a single operation signal generator for monitoring the output of the frequency detector to output a single operation signal when the monitored output deviates from a range between allowable upper limit and lower limit around a reference frequency. It is possible to detect the single operation by actively disturbing the balance between the energy generated by the synchronous generator and the power consumed by the distributed power supply, when the synchronous generator is disconnected from the cooperation with power system.