光伏并网系统中孤岛检测新方法探讨

Discussion on a New Method of Island Detection in Photovoltaic Grid-connected System

对目前光伏并网系统中主流的本地孤岛检测法相关原理进行了介绍,总结了主动式和被动式检测法的优缺点,在此基础上提出了混合式检测法。在实际工程应用中,应该基于实际的工况,合理选择至少一种方法用于孤岛检测,其中将主、被动两种或以上不同原理的方法按照一定方法组合使用,检出率更高,对电网扰动更小。

The relevant principles of local island detection in the current photovoltaic grid-connected system are introduced.The advantages and disadvantages of active and passive detection methods are summarized.On this basis,a hybrid detection method is proposed.In practical engineering applications,at least one method should be reasonably selected for island detection based on actual working conditions,in which two or more methods with different principles of active and passive should be combined in accordance with certain methods to achieve higher detection rate and less disturbance to power grid.