A Hybrid Multi-feature based Islanding Detection Technique for Grid Connected Distributed Generation

Abstract

This paper presents a hybrid islanding detection technique for grid connected Distributed Generations (DGs). The proposed scheme is based on three different decisive factors which are derived from negative sequence voltage (NSV) by applying Hilbert transform, Wavelet transform and standard normal distribution function. Different types of non-islanding and islanding events have been simulated by modeling IEEE 34-bus system using PSCAD/EMTDC software package. The performance of the proposed scheme has been evaluated on large number of cases which are generated by varying load and fault parameters. The simulation results indicate that the proposed scheme is able to detect islanding situation accurately even under perfect power balance condition. Moreover, the proposed scheme provides better stability in case of specific type of non-islanding event i. e. fault on adjacent feeder during which most of the existing scheme issues nuisance tripping. Furthermore, it provides satisfactorily results during change in network topology and also at different values of X/R ratio of DG. At the end performance of the proposed technique is also comprehensively compared with the schemes currently reported in the literature. This comparison apparently demonstrates the advantages of the proposed technique over existing schemes.

Islanding detection in a distribution network with distributed generators using signal processing techniques

“…S-transform represents the time-frequency relationship with instantaneous values of frequency, phase and amplitude [24]. It gives the absolutely referenced phase information & frequency invariant amplitude response & provides better signal clarity for transient signal.…”

Anti-Islanding Protection of PV-Based Microgrids Consisting of PHEVs Using SVMs

“…Generally, the islanding detection strategies can be classified into local and remote (communication-based) categories. Communication-based islanding detection techniques cover the most of NDZs using communication technologies, by confirming distribution network CB is out of state to prevent islanding [3]. The cost of equipment and moreover, reconfiguration of settings every time when new component is added or taken from grid, are the major drawbacks of these methods.…”

“…The methods based on active entanglement and passive monitoring are localized algorithms for recognizing islanding mode which are working based on tracking and/or changing particular parameters of DN such as voltage [3], reactive power [5], frequency [6]. By injecting the disturbances into DN at the PCC and tracking down the response of DN, the active methods tend to make the most negative impact to PQ and thus they have.…”