描述
孤岛现象是指当电网由于电气故障或自然因素等原因中断供电时,光伏并网逆变器仍然向电网输送电能,从而形成一个电力公司无法控制的自给供电孤岛,称之为“孤岛效应”。光伏并网发电系统中孤岛的发生会产生严重的后果,对用户的用电设备和检修人员的安全造成重大危害。孤岛发生时,若孤岛中的电压和频率超出允许的范围,可能会对用户的设备造成损坏;电网的掉电可能使光伏发电系统过载运行,易被烧毁;与光伏发电系统相连的线路仍然带电,对检修人员造成危险。所以当电网停电后,必须立刻中止系统对电网的供电,防止孤岛效应的发生。反孤岛效应的关键是电网断电的检测,且检测时间越短效果越好。一般采取被动检测法和主动检测法。被动检测法是实时检测电网电压的频率和相位,通过频率和相位的异常来判断电网是否失电。采用被动的孤岛检测方法不足以在负载匹配的情况下有效检测出孤岛现象,为此,必须采用主动式的检测方法。主动检测法是通过实时对电网参数发出干扰信号,通过检测反馈信号来判断电网是否失电。常见的方法有主动频率偏移法、滑模频率偏移法和输出功率扰动检测法等。
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