Application of μPMUs for adaptive protection of overcurrent relays in microgrids. Issue 18 (5th September 2018)

• Record Type: Journal Article
• Authors: Ghalei Monfared Zanjani, Mohsen; Mazlumi, Kazem; Kamwa, Innocent
• Is Part Of: IET generation, transmission & distribution. Volume 12:Issue 18(2018)
• Page Start: 4061
• Page End: 4068
• Publication Date: 2018-09-05
• Subjects: phasor measurement -- relay protection -- distributed power generation -- power generation protection -- overcurrent protection -- power generation faults -- power transmission protection -- power transmission faults -- particle swarm optimisation -- fault currents -- power generation reliability -- power transmission reliability; μPMU -- adaptive overcurrent relay protection -- microgrid overcurrent relays coordination -- microphasor measurement units -- relays fault current -- operating costs -- fault current injection -- network uncertainties -- line outages -- power plant outages -- transmission network -- online uncertainty detection -- Thevenin impedance estimation -- microgrid point‐of‐common coupling -- data analysis -- phasor data concentrators -- particle swarm optimisation algorithm -- IEEE 9‐bus system -- DigSILENT software package -- MATLAB software package; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2018.5898
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : This study proposes a new application of micro‐phasor measurement units (µPMUs) for adaptive coordination of overcurrent relays in microgrids. Mis‐coordination of overcurrent relays usually arising from the variation of relays fault current and it can cause damage to equipment of network and raise operating costs. Fault current injection and direction to microgrid are highly dependent on network uncertainties; therefore, fault current is affected by line and power plant outages. This study proposes an algorithm to detect these uncertainties in online operation. Then, microgrid overcurrent relays coordination is optimised again. Uncertainties are line and power plant outages in transmission network and microgrid side and two distinct methods are used for each. For online detection of uncertainties in the transmission side, it is assumed that a µPMU is installed between transmission network and microgrid point of common coupling; so, the topology changes such as line outage is detected by monitoring of Thevenin impedance estimation that is obtained by µPMU measurements. Uncertainties detection in a microgrid is done by signals that are sent by µPMUs and installed all over the microgrid. All data are gathered and analysed in phasor data concentrators and then overcurrent relays coordination is updated with such changes.