| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To satisfyΔV10 to eliminate a flicker problem, while detecting an independent operation at high speed. <P>SOLUTION: A method, which detects whether or not a distributed power supply is separated from an electric power system and is performing independent operation by causing power fluctuation to the power system, includes a step in which electric energy (power fluctuation value) which is to be injected to cause the power fluctuation to the power system is calculated based on a period deviation, which is a deviation of the current system period and the past system period. In this step, a voltage variation portionΔVn in each fluctuating frequency fn of the power system is converted into a variation valueΔV10 of 10 Hz in a flicker visibility curve and the calculation above is carried out in such a manner that the converted fluctuation valueΔV10 satisfies a permissible amount, which is a judgment criterion for taking a countermeasure against the flicker. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
