TITLE:
Islanding Protection and Islanding Detection in Low Voltage CIGRE Distribution Network with Distributed Generations
AUTHORS:
Ghullam Mustafa Bhutto, Ehsan Ali, Jagdesh Kumar, Muhammad Akram Bhayo
KEYWORDS:
Islanding Protection, Loss of Grid (LOG), Over Current Protection, Under Voltage Protection, Fuses, Relays, Island Detection (ID)
JOURNAL NAME:
Smart Grid and Renewable Energy,
Vol.5 No.6,
June
23,
2014
ABSTRACT:
The Power Quality
(PQ), security, reliability etc., are the prime objectives of the power system.
The protection is developed in such a way that it should be selective, fast,
reliable and the cost effective. The study about the islanding protection in
Low Voltage (LV) CIGRE distribution and networks like this has been proposed in
this paper. This is achieved by developing the protection against the short
circuit faults which might appear at the Medium Voltage (MV) bus. The
protection of the network with significant penetration of the Distributed
Generations (DGs) is a complicated process. The DG units which are directly
connected to the grid such as synchronous or induction generators contribute
large short power, whereas the DG units which are connected to the grid via
inverters carry small amount of the short circuit power. This creates the
problems in the protection of the network. If the proper protection
coordination measures have not been taken, it might cause the mal-function of the
protection devices which put the portion of the power network into the security
threats. The selection of the islanding protection devices in this paper is
made to protect the network against bi-directional currents at the time of
short circuit fault. The LV CIGRE distribution network will enter into
islanding if a fault is cleared at the MV bus by the proposed islanding
protection devices. It is therefore, essential to detect the islanding in the
CIGRE power network. The detection of the island in this network is another
major objective of this paper. The detection of the island is proposed by using the technique which is based
on the voltage phase angle difference. The
simulations are carried out by using DIgSILENT power factory software version
15.0.