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中文摘要：
为了研究分布式发电并网时基于正反馈主动移频法（AFDPF）能有效检测出孤岛效应的负载品质因素的条件,基于UL1741标准下的孤岛检测电路要求和AFDPF孤岛检测原理,通过逆变器输出电流与公共点电压的相位差确定反馈系数范围,接着通过分析逆变器输出电流的相角比并联谐振负载的相角变化的更快的条件,进一步确定能有效检测出孤岛效应的负载品质因素取值范围.最后,基于比例谐振控制器下设计孤岛检测电路,通过MATLAB/Simulink仿真,验证所提研究结论.
英文摘要：
The paper proposed a method to effectively determine the value range of load quality factor according to active frequency drift with positive feedback （AFDPF） for islanding detecting. First, a circuit detection condition and AFDPF algorithm for islanding detection were introduced based on UL 1741 standard. Second, the feedback factor range was determined by phase difference between inverter output current and voltage at a common point. Load quality factor was worked out by the condition that the phase change speed of output current for the inverter was quicker than that for the load. Finally, the conclusion was verified based on MATLAB/Simulink.
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