| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely and easily detect the single operation of a regular-use generating set in system linkage at the side of the regular-use generating set, and to protect the regular-use generating set. <P>SOLUTION: This system linkage protection device of the regular-use generating set comprises: a cycle detection means that detects an output voltage signal of a synchronous motor, and detects a cycle on the basis of the output voltage signal; a cycle correction amount operator that outputs a cycle correction amount proportional to an output of a voltage variation amount first operator that detects an amount of the variation of a positive-side half wave of the output voltage signal; a reverse number operator that operates a frequency by adding the cycle correction amount to a cycle output from the cycle detection means; and a voltage oscillation signal operator that makes an automatic voltage adjuster of the synchronous motor output a voltage oscillation signal that lowers the output voltage of the synchronous motor when a frequency change rate detected by a frequency change rate operator that detects the change rate of the frequency is positive, and raises the output voltage of the synchronous motor when the frequency change rate is negative. When the frequency change rate detected by the frequency change rate operator exceeds a prescribed value, a blocker that links systems is released, and the synchronous motor is paralleled off from an AC power system. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
