CAJ | 학술논문

孤岛的发生不仅会导致电力系统设备损坏，严重时还会出现威胁电力系统维修人员的生命安全等一系列问题。因此，光伏并网发电系统必须具备孤岛检测功能，以保证电网的安全运行。传统的AFD（Active Frequency Drift）检测方法在不同的负载下，检测效果不同，对纯阻性负载检测效果比较好。尽管科研工作者提出了基于反馈调节、周期性扰动的AFD法，可以减少THD，但同时减慢了检测速度。鉴于此，提出了一种基于新型的扰动方式的孤岛检测方案，比传统的AFD检测方法谐波低，盲区小，检测速度更快，具有很高的实用价值。Matlab/Simulink仿真以及实验结果表明，该方法比传统的AFD检测方法更具有优势。
고도적발생불부회도치전력계통설비손배，엄중시환회출현위협전력계통유수인원적생명안전등일계렬문제。인차，광복병망발전계통필수구비고도검측공능，이보증전망적안전운행。전통적AFD（Active Frequency Drift）검측방법재불동적부재하，검측효과불동，대순조성부재검측효과비교호。진관과연공작자제출료기우반궤조절、주기성우동적AFD법，가이감소THD，단동시감만료검측속도。감우차，제출료일충기우신형적우동방식적고도검측방안，비전통적AFD검측방법해파저，맹구소，검측속도경쾌，구유흔고적실용개치。Matlab/Simulink방진이급실험결과표명，해방법비전통적AFD검측방법경구유우세。
The happening of the island will bring people not only a serious security threat, but also a series of problems, like leading to a damage of system equipment. Therefore, photovoltaic grid power system must be equipped with the islanding detection function to ensure the safety of the power grid. The traditional AFD’ detecting effects is different under different loads, and it’s good for the impedance load. Although the improved AFD based on feedback adjustment or periodic disturbance proposed by former researchers can reduce the THD, the detecting speed slowed down at the same time. In view of this, this paper proposes a new active island detection method based on a novel perturbation way, it has the lower THD, the smaller blind area and the more faster detecting speed compared with the traditional AFD, so it has a high practical value. Matlab/Simulink simulation and the experiment results show that the new method is better than the traditional AFD.