主动移频式孤岛检测方法的参数优化

孤岛检测是光伏系统并网必备的功能，要求既能快速检测出孤岛状态，同时又尽量减少对电网的不良影响。孤岛检测性能的好坏不仅取决于所采用的孤岛检测策略，也取决于检测策略中参数的设置是否合理，但目前的研究在参数优化的理论指导方面严重不足。该文通过对主动移频式孤岛检测方法的检测盲区进行分析，推导了带线性正反馈主动移频式(active frequency drift with positive feedback, AFDPF)孤岛检测方法的盲区大小与反馈增益间的关系，并得出特定负载下孤岛检测无盲区AFDPF反馈增益的取值范围，从而为AFDPF孤岛检测方法的参数优化提供了理论指导。

Parameter Optimization of Active Frequency Drift Islanding Detection Method

Anti-islanding protection is mandatory feature for grid-connected inverters. Desired islanding detection method not only can detect islanding within acceptable duration, but also require it has less adverse impact on power quality. The performance of islanding detection method is usually subject to anti-islanding strategy and parameter setting. The paper analyzes non detection zone (NDZ) of active frequency drift (AFD) and active frequency drift with positive feedback (AFDPF). Based on analysis the relationship between NDZ and feedback gain of AFDPF is deduced, which can be expressed as a mathematics equation and gives range for feedback gain to guarantee anti-islanding protection. The calculation is simple and accurate, thus can be taken as a good guideline in AFDPF parameters setting.