Under-frequency load shedding technique considering event-based for an islanded distribution network

Abstract EN

One of the biggest challenge for an islanding operation is to sustain the frequency stability.

A large power imbalance following islanding would cause under-frequency, hence an appropriate control is required to shed certain amount of load.

The main objective of this research is to develop an adaptive under-frequency load shedding (UFLS) technique for an islanding system.

The technique is designed considering an event-based which includes the moment system is islanded and a tripping of any DG unit during islanding operation.

A disturbance magnitude is calculated to determine the amount of load to be shed.

The technique is modeled by using PSCAD simulation tool.

A simulation studies on a distribution network with mini hydro generation is carried out to evaluate the UFLS model.

It is performed under different load condition: peak and base load.

Results show that the load shedding technique have successfully shed certain amount of load and stabilized the system frequency.