Agent-based protection scheme for distribution networks with distributed generators

2006 ◽  
Author(s):  
N. Perera ◽  
A.D. Rajapakse
Keyword(s):  
Distribution Networks ◽  
Agent Based ◽  
Protection Scheme ◽  
Distributed Generators

A Relay Scheme for Distribution Networks Considering the Control Mode of Inverter-Based Distributed Generator

2013 ◽  
Vol 805-806 ◽  
pp. 801-804
Author(s):  
Yan Xia Zhang ◽  
Yan Li
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Current Source ◽  
Distribution Networks ◽  
Control Mode ◽  
Equivalent Model ◽  
Positive Sequence ◽  
Distributed Generator ◽  
Protection Scheme ◽  
Distributed Generators

In the distribution system including distributed generators, it is difficult to meet the requirements of selectivity and sensitivity for traditional current protection. Currently, inverter-based distributed generators (IBDG) are widely used in distribution systems. The transient process of IBDG is rapid, and its transient characteristics are influenced by the control strategy. The controlled current source equivalent model of IBDG with positive-sequence P-Q control is put forward. After analyzing the fault characteristics, the protection scheme using negative sequence current is proposed, which can be used in the distribution systems including IBDG under positive-sequence P-Q control. The simulation results on a 10kV distribution system have verified the correctness of faults characteristics and the effectiveness of protection scheme.

scholarly journals An Adaptive and Decentralized Protection Scheme for Microgrid Protection

2019 ◽  
Author(s):  
Mahdi Ghotbi Maleki ◽  
Hamid Javadi ◽  
Mojtaba Khederzadeh ◽  
Siamak Farajzadeh
Keyword(s):  
Short Circuit ◽  
Characteristic Curve ◽  
Short Circuit Current ◽  
Distribution Networks ◽  
The Other ◽  
Central Unit ◽  
Backup Protection ◽  
Protection Scheme ◽  
Distributed Generators ◽  
Overcurrent Relays

In this paper a protection scheme is provided to protect microgrid by considering the problems that are generated by addition of distributed generators to distribution networks and change these networks from passive to active. At first, changes in microgrid conditions that can affect short-circuit current is explained. Then Based on these changes, an algorithm is proposed to update relays settings. The algorithm can be used for both instantaneous and inverse time relays. In this protection scheme, central unit has no place and relays are responsible for monitoring microgrid and update their settings. In other words, this protection scheme is an adaptive and decentralized microgrid protection scheme. Instantaneous overcurrent relays are used in this paper. To avoid storing large amounts of setting data in relays memory, a method for calculating pickup current of instantaneous relay is provided. Since digital relays used, a new characteristic curve for instantaneous relay for better performance in the field of backup protection is defined. This new characteristic curve has two peakup currents: one of them for main protection and the other one for backup protection. Then coordination of instantaneous relay using the new characteristic curve is explained. At the end, this protection scheme is implemented on a microgrid.

Dynamic Improvement of Distributed Generators Connected To Distribution Networks Using DSTATCOM

2012 ◽  
Vol 5 (3) ◽  
pp. 16-22
Author(s):  
P. Harshavardhan Reddy ◽  
◽  
J.N. Chandra Sekhar ◽  
M. Padma Lalitha ◽  
◽  
...  
Keyword(s):  
Distribution Networks ◽  
Distributed Generators

A Proposed FLISR Approach for Distribution Networks with Distributed Generators

2020 ◽  
Author(s):  
Phuc Duy Le ◽  
Duong Minh Bui ◽  
Cao Cuong Ngo ◽  
Thanh Phuong Nguyen ◽  
Cong Phuc Huynh ◽  
...  
Keyword(s):  
Distribution Networks ◽  
Distributed Generators
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