Restoration of Directional Overcurrent Relay Coordination in Distributed Generation Systems Utilizing Fault Current Limiter

Univ. of Western Ontario, London
IEEE Transactions on Power Delivery (Impact Factor: 1.66). 05/2008; 23(2):576 - 585. DOI: 10.1109/TPWRD.2008.915778
Source: IEEE Xplore

ABSTRACT A new approach is proposed to solve the directional overcurrent relay coordination problem, which arises from installing distributed generation (DG) in looped power delivery systems (PDS). This approach involves the implementation of a fault current limiter (FCL) to locally limit the DG fault current, and thus restore the original relay coordination. The proposed restoration approach is carried out without altering the original relay settings or disconnecting DGs from PDSs during fault. Therefore, it is applicable to both the current practice of disconnecting DGs from PDSs, and the emergent trend of keeping DGs in PDSs during fault. The process of selecting FCL impedance type (inductive or resistive) and its minimum value is illustrated. Three scenarios are discussed: no DG, the implementation of DG with FCL and without FCL. Various simulations are carried out for both single- and multi-DG existence, and different DG and fault locations. The obtained results are reported and discussed.

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    • "Therefore, in this research, a novel method based on KF is proposed for fault location. Fault current limiters (FCLs) are another suitable alternative of the relays utilized in [10], which can quickly limit fault current after fault occurrence [17], [18]. Furthermore, protection relays result in perfect segregation of faulty sections from the network , while FCL can preserve the integrity of the network's sections . "
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    ABSTRACT: Abstract— Penetration of Distributed generations (DG) are becoming more and more widespread in the current electric power networks. One of the most important issues regarding utilization of DG in power systems is related to their impact on fault current level. In this regard, a multi-agent-based fault current limiting scheme for microgrids is presented in this paper. A typical microgrid is divided into several sections. A number of Superconducting Fault Current Limiters (SFCLs) which are located in suitable locations of the network, can suppress transient fault currents. Fault location is identified using several Fault Location Identification Units (FLIUs), which are installed in suitable places. In each FLIU, fault current is estimated using a Kalman filter and then residual signal is generated from the calculated and measured fault current. In fault condition, faulty section is identified by analyzing the information of FLIUs in the network. Then, the impact of the faulty section on the sound sections is minimized by utilizing the proposed fault current limiting scheme. Capabilities of the proposed method are evaluated using different simulations on a benchmark microgrid.
    IEEE Transactions on Power Delivery 01/2013; 29(2). DOI:10.1109/TPWRD.2013.2282917 · 1.66 Impact Factor
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    • "The islanding operation with DGs is prohibited due to the restoration , personnel safety and power quality issues [11]. Therefore , the DGs need to be disconnected even for temporary faults [12]. As the penetration level increases, the disconnection of these DGs drastically reduces the benefits of DGs [13]. "
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    01/2011; DOI:10.1109/IECON.2011.6119434
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    Power Engineering and Optimization Conference (PEOCO), 2010 4th International; 07/2010
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