Defining Islanding Techniques for Islanding Operation of Micro grid

A Micro grid (MG) [1], [6] is an integrated energy system comprising of distributed energy resources and multiple electrical loads operating in a single and autonomous grid. Normally, micro grid operates in interconnected mode with the medium voltage network; however, scheduled or forced isolation can also take place. Hence, micro grid must have stable operations in such conditions.

When micro grid isolation takes place, its feasibility of control techniques to be adopted for its operation along with a new approach for islanding detection in distributed generation (DG) using Rate of Change of Phase Angle Difference (ROCPAD) [2] is proposed here. Using synchronous transformation based algorithm, the process begins when retrieving of the voltage and current signals at the DG end is done followed by estimation of the phasors (amplitude, phase and frequency) which is very important for computation of the phase angle difference and ROCPAD for islanding detection.

The goals of this paper are to explain the principle of micro grid to clarify the main ideas and positive features of the micro grids by using islanding detection techniques mainly by ROCPAD islanding technique.