CAJ | 학술논문

针对传统Sandia频率偏移(SFS)算法在多逆变器并网条件下孤岛检测性能的不足，提出了一种基于参数自适应的改进SFS算法。该算法利用数字相关原理检测公共耦合点电压与逆变器输出电流间相位差，根据测到的相位差对SFS算法中的初始斩波系数c f0及正反馈增益K 随逆变器频率检测误差及负载品质因数的不同做相应调整，以消除稀释效应及高品质因数负载所导致的孤岛检测失败。理论分析及仿真实验结果表明，所提出的改进 SFS算法在出现稀释效应及负载条件较恶劣的情况下，孤岛检测性能明显优于传统算法。
침대전통Sandia빈솔편이(SFS)산법재다역변기병망조건하고도검측성능적불족，제출료일충기우삼수자괄응적개진SFS산법。해산법이용수자상관원리검측공공우합점전압여역변기수출전류간상위차，근거측도적상위차대SFS산법중적초시참파계수c f0급정반궤증익K 수역변기빈솔검측오차급부재품질인수적불동주상응조정，이소제희석효응급고품질인수부재소도치적고도검측실패。이론분석급방진실험결과표명，소제출적개진 SFS산법재출현희석효응급부재조건교악렬적정황하，고도검측성능명현우우전통산법。
In view of the inadequate performance of islanding detection of the traditional Sandia frequency shift (SFS) method for multiple grid-connected inverters,an improved SFS algorithm based on adaptive parameters is proposed.The algorithm uses the digital correlation theory to detect the phase difference between the voltage of the point of common coupling and the output current of the inverter.According to the phase difference,the initial chopping coefficient cf0 and positive feedback gain K of the SFS algorithm are adj usted accordingly with respect to the detection error of frequency and load quality factor,so as to eliminate the failure of islanding detection caused by the dilution effect and high quality factor of load.Theoretical analysis and simulation experiment results show that the improved SFS algorithm is evidently superior to the traditional algorithm in the case of dilution effect and bad load conditions.