S变换在孤岛检测中的应用

Application of S-transform in islanding detection

针对光伏发电系统中传统孤岛检测方法存在的诸多缺陷,提出一种以并网点高次谐波电压为特征量的孤岛检测方法。测量并网点谐波电压,用S变换法提取测量电压中包含的高次谐波电压分量,以此分量作为孤岛识别和检测指标,无需外加扰动,即可消除检测盲区。理想光伏发电并网系统进行的仿真证明,在IEEE.Std 1547规定的最差情况下,本方法进行的孤岛检测仍可快速、准确地检测到孤岛现象。

For traditional photovoltaic generation system islanding detection methods exist many defects,A new Islanding detection method is proposed,which need not plus disturbance and can eliminate non-detection zone（NDZ） by extracting the higher harmonic components from the S-transformation of point of common coupling（PCC） voltage.Based on IEEE Std.1547,Simulated verification of the proposed method is accomplished in the ideal photovoltaic grid system,which can be fast,accurate detection to the occurrence of islanding phenomenon.