Assessment of P-V droop characteristics in islanding detection with frequency-dependent ZIP-exponential static load

An analytical approach for islanding detection is proposed in this paper, which relies on analyzing the active power verses voltage (P-V) droop of the DG and the islanded load. Antiislanding techniques are typically designed and tested on constant RLC loads, don´t take into account the frequency dependent loads. The behavior of the frequency dependent ZIP-exponential static loads during islanding operation is clearly discussed in this proposed technique. In order to achieve negligible nondetection zone (NDZ), three different P-V droop with three different P_ref curves are tested over here. Result shows that P_ref = (2V-1) is appropriate to facilitate islanding detection with smaller NDZ. The further study is carried out in order to investigate the effect of P-V droop to the load curves. The main advantage of the proposed technique is that it is a simple approach for islanding detection and has negligible NDZ.