基于功率控制的分布式并网发电孤岛检测研究

ispersed power generation systems such as photovoltaic, fuel cell, wind power generation need to be connected to a utility power grid for the systems to work effectively. In order to avoid the negative impacts from islanding operation, a novel islanding detection method based on Power Controlling is presented in this paper, The method continuously perturbs the reactive power supplied by dispersed generation systems while simultaneously monitoring the point of common coupling (PCC) voltage and frequency. If islanding were to occur, a measurable frequency deviation takes place, After it is over 4 cycles continuously, then the real power of dispersed generation systems is reduced to 80%, now a drop in voltage positively confirms islanding, and the dispersed power systems is safely disconnected. Algorithm of the method is simple and confirmed by simulation with MATLAB.