【摘要】 针对传统光伏并网系统主动移频式孤岛检测方法存在反馈增益为定值、并网电流谐波畸变率高等问题,提出了一种改进的主动移频式孤岛检测方法。其基本思路是使传统主动移频式方法中的正反馈增益系数随电网运行的状态自动改变,从而实现在提高检测精度、减小检测盲区的同时减小电流谐波畸变率的目标。文中详细描述了改进方法的基本原理,并在Matlab/Simulink中搭建了一个基于改进方法的1 kW单相光伏并网孤岛检测实验系统,论证了方法的有效性。更多还原

【Abstract】 Aiming at the problems such as the constant feedback gain and high harmonic distortion rate of the grid-connected current for the traditional active frequency-drift(AFD) islanding detection method,an improved AFD method is proposed.The essential idea for the method is to make the positive feedback gain coefficient in traditional AFD method automatically vary with the state of the operation of the grid,thus implementing the operation target for the decrease of harmonic distortion as well as increase of the detection accuracy and reduction of the non-detection zone.A detailed description of the fundamental principle is made,and a demonstration of the effectiveness is performed by constructing the experimental system on MATLAB/Simulink platform for a 1kW single-phase photovoltaic grid-connected islanding detection which is based on the method.更多还原