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Investigating the effects of reactive power on islanding detection
, Article 2004 International Conference on Power System Technology, POWERCON 2004, 21 November 2004 through 24 November 2004 ; Volume 2 , 2004 , Pages 1067-1071 ; 0780386108 (ISBN) ; Parniani, M ; Fotuhi Firuzabad, M ; Sharif University of Technology
2004
Abstract
Distributed generation (DG) portion of power production is increasing more and more. DG poses different benefits and difficulties in a power system. Inadvertent islanding is a problem with DG which may cause health danger to line crew and can damage both DG and power system equipments. This paper investigates the effect of reactive power on ROCOF islanding detection method. Impacts of load power factor and load combination are studied using a sample test system. The paper offers a corrective method to cope with impacts of load reactive power. A way is suggested to locate DG such that the role of reactive power becomes a positive factor in islanding detection. © 2004 IEEE
Power System Frequency Estimation for Protection Application in Accordance with IEC 60255-181
, M.Sc. Thesis Sharif University of Technology ; Hajipour, Ehsan (Supervisor)
Abstract
The frequency of the system is one of the important network parameters that must be continuously monitored. In new power networks, due to the fact that inverter loads and renewable power plants have increased, frequency estimation has faced many problems. Due to the fact that these renewable power plants have little inertia, the networks that include these power plants are faced with rapid frequency changes in the presence of network incidents and transients such as load shedding and power plant blackout or fault, and therefore they should Be equipped with accurate frequency relays or relays to detect the rate of frequency changes. Also, the increase in the amount of harmonic pollution of...
A novel hybrid islanding detection method for inverter-based DGs using SFS and rOCOF
, Article IEEE Transactions on Power Delivery ; Volume 32, Issue 5 , 2017 , Pages 2162-2170 ; 08858977 (ISSN) ; Vahedi, H ; Khazaeli, F ; Oraee, H ; Sharif University of Technology
Abstract
This paper is aimed at proposing a new hybrid method for the islanding detection of distributed-generation (DG) units. Hybrid method operation is based on the combination of an active and a passive method, for which the optimized Sandia frequency shift (SFS) method is used as the selected active method, and rate of change of frequency relay (ROCOF) is used as the passive method. In order to demonstrate the effectiveness of the proposed technique on islanding detection, several simulation studies based on IEEE 1547 and UL1741 anti-islanding test requirements are carried out. The evaluation of simulation results reveals that the control system, based on the proposed hybrid algorithm, meets the...