Abstract
This paper proposes an anti-islanding control for a grid connected distributed generation system. The proposed control is based on d-q frame. The scheme using current command reference as positive feedback is utilized to drift the PCC voltage beyond the threshold limits to detect islanding within 2 seconds as prescribed by IEEE 1547. The test system configuration and parameters for anti-islanding study is prepared on IEEE 929 standards. The effectiveness of proposed anti-islanding scheme is validated by simulation done in MATLAB platform.
Highlights
Islanding is a condition in which a portion/area of electrical power system remains energized by the distributed generation (DG) like PV, wind energy, diesel etc. even in the absence of grid
While active scheme are based upon the concept of injecting disturbances and analyzing the changes in the system parameters at the PCC when the grid is in disconnected mode
Active schemes are neither cost effective nor technology neutral but their NDZ is very less in comparison to passive methods
Summary
Islanding is a condition in which a portion/area of electrical power system remains energized by the distributed generation (DG) like PV, wind energy, diesel etc. even in the absence of grid. In passive anti-islanding method, islanding is detected by measurement of certain parameters like voltage, current at the PCC. This paper proposes an active anti-islanding scheme which uses current command as a disturbance when multiplied by voltage signal and voltage gain as a feedback to destabilize the distributed generation under grid disconnected mode. If ∆QQ ≠ 0, the inverter control will cause the frequency of inverter output current to change until ∆QQ = 0 This can be detected by OFP/UFP [2], [9]. Under this condition when breaker opens, the load and DG will resonate at nominal frequency and voltage until some mechanism which forces the voltage and frequency to go beyond the limit
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