求翻译：为了维持孤岛系统的稳定运行，应根据分布式电源容量和本地负荷的大小，事先确定好合理的孤岛区域，在与主系统隔离后，不需要大的调节就能够保持孤岛内功率的平衡和电压频率的稳定。这种事先划定的孤岛区域，称为计划孤岛是什么意思？

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In order to maintain the stability of the system run Islands, should be based on distributed power capacity and local load size, determine in advance the islands come to a rational, in isolation from the main system, after the adjustment is not required for the islands will be able to maintain the b

In order to maintain the isolated island system the stable movement, should act according to the size which the distributional power source capacity and local shoulders, determined beforehand the good reasonable isolated island region, in isolates after the host system, does not need the big adjustm

Islands of in order to maintain the stable operation of the system, should be based on distributed generation capacity and local workload size, predetermined a good reasonable Islands region, after the isolated from the main system, does not require a large adjustment in order to maintain the balanc

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