INTERCONNECTED POWER GENERATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a interconnected power generation system preventing damages to a turbine generator while releasing the interconnected power generation system from an electric power system of the commercial power supply, by detecting power receiving abnormality in the commercial power supply.

SOLUTION: The interconnected power generation system comprises a system interconnection inverter 14, a voltage phase shift circuit 20 synchronizing the output voltage phase of the system interconnection inverter 14 to the commercial power voltage phase by monitoring the zero crossing of the commercial power voltage to shift the output voltage phase from the commercial power voltage phase to shift the shifted output voltage phase to the commercial power voltage phase, a phase comparator 24 comparing a voltage phase of a commercial power system 10 with the output voltage phase, and a system interconnection control device 30 detecting power interruption by a power supply cutoff from the commercial power system 10 to transmit a control signal to a breaker 22 to interrupt an output of the system interconnection inverter 14 from the commercial power system 10 based on a conformed signal output from the phase comparator 24 to continue by a prescribed number of times.

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