Computational geometry‐based methodology for identification of potential islanding initiators in high solar PV penetration distribution feeders

Abstract

Accidental disconnection of a live feeder section is a major concern accompanying large distributed solar photovoltaic (PV) generation integration. High localised penetration can alter power flows leading to anomalous occurrences. Load-inverter power balance during grid-side disturbances, for different load models, may cause unique situations that can trigger the interconnection point protective devices. One such phenomenon, identified as a potential cause of unintentional islanding on radial feeder models (a modified IEEE feeder in simulation and verified on a laboratory-hardware network), has been used in this work. A pre-emptive detection strategy has been implemented to identify such islanding initiators among other power system transients. Computational geometry concepts have been utilised to create an optimisation-derived feature extraction methodology for effective training of a classifier module realised in a Raspberry Pi microcomputer. This module predicts the class labels of test data points transmitted from simulations carried on a personal computer for the feeder model. The proposed pre-emptive islanding detection strategy can trigger an appropriate change in a PV inverter's operating mode before a feeder protective device is tripped by such island initiating anomalies. The online classification accuracy and speed indicate a possible integration of the proposed methodology and strategy with the inverter's control circuitry.

Grid Synchronization and Islanding Detection Methods for Single-Stage Photovoltaic Systems

“…Taking into account also the recent advancement in computing capability and communication systems, hybrid islanding detection techniques, based on combinations of the four categories previously discussed, represent the most promising techniques [115][116][117][118][119][120][121][122][123][124][125]. Starting from combination or modification of conventional methods, in [115] some islanding detection methods are proposed as integration of well-known passive methods.…”

“…Moving towards more innovative solutions, in [121] a new islanding detection technique is based on the addition of a variable impedance and a hybrid automatic transfer switch. In [122] computational geometry has been applied to derive an islanding detection technique based on a classifier module. As in case of the active methods, the technique discussed in [123] uses harmonic current injection.…”

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