scholarly journals Influence of Distributed Generation on Relay Protection in Distribution Network and Protection Scheme

2017 ◽  
Author(s):  
GUO ZHANG ◽  
ZHI-YING DUAN ◽  
BAO-JI YUN
Keyword(s):  
Distributed Generation ◽  
Distribution Network ◽  
Relay Protection ◽  
Protection Scheme

Analysis of the Impact of Distributed Generation on Distribution Network Protection

2012 ◽  
Vol 433-440 ◽  
pp. 5924-5929 ◽  
Author(s):  
Jie Dong ◽  
Ya Jun Rong ◽  
Chun Jiang Zhang
Keyword(s):  
Distributed Generation ◽  
Theoretical Basis ◽  
Short Circuit ◽  
Distribution Network ◽  
Relay Protection ◽  
Fault Current ◽  
Protection Scheme ◽  
Network Protection ◽  
The Impact ◽  
Short Circuit Condition

With the connection of distributed generation (DG), structure of traditional distribution network changes and original relay protection scheme should be adjusted. On the basis of introducing the concept and advantages of distributed generation, this paper discusses the influence of distributed generation with different position or different capacity on current protection. The paper analyzes magnitude and distribution of fault current under short-circuit condition and change curves of fault current are given, which provides some theoretical basis for new relay protection scheme.

Study on Protection Scheme for Low-voltage Distribution Network with Distributed Generation

2013 ◽  
Vol 12 (16) ◽  
pp. 3655-3659 ◽  
Author(s):  
Zhu Xueling ◽  
Zhou Ning ◽  
Han Fei ◽  
Li Qiang ◽  
Li Daokuan
Keyword(s):  
Distributed Generation ◽  
Low Voltage ◽  
Distribution Network ◽  
Voltage Distribution ◽  
Protection Scheme

Protection Scheme for Distribution Network with Distributed Generation

2014 ◽  
Vol 960-961 ◽  
pp. 1376-1380
Author(s):  
Chong Xin Xu ◽  
Yan Jun Jiao
Keyword(s):  
Power Generation ◽  
Distributed Generation ◽  
Distribution System ◽  
Distribution Network ◽  
Protection System ◽  
Protection Scheme ◽  
Network Protection ◽  
New Energy ◽  
Comprehensive Judgment

Power generation becomes a main way of using new energy. However, the access of distributed generation(DG) causes the ordinary protection system develop a series of problems. In this paper, the structure of distribution network with DG is introduced firstly.Secondly,it is analysed that the effect that DG brings to distribution network protection, and then a new protection scheme of distribution network with DG is put forward. The segment I, II of direction three-current protection on the line which is at the upstream of DG, and the next line’s segment I, II consists of a simple communication unit. Through the comprehensive judgment of two protections’ action results, fault can be isolated in minimum range quickly and accurately. Finally, the correctness and feasibility of the new protection principle are verified by simulating a 10KV distribution system.

An intelligent protection scheme to mitigate the impact of integrating large share wind energy resources in a weak distribution network

2017 ◽  
Vol 41 (6) ◽  
pp. 383-396 ◽  
Author(s):  
Naser El Naily ◽  
Saad M Saad ◽  
Zakariya Rajab ◽  
Faisal Mohamed
Keyword(s):  
Distributed Generation ◽  
Distribution Network ◽  
Operating Conditions ◽  
Protection System ◽  
System Stability ◽  
Protection Scheme ◽  
System Protection ◽  
Renewable Distributed Generation ◽  
Medium Level ◽  
The Impact

Although integration of wind distributed generation directly into the distribution level has considerable advantages, increased penetration of wind distributed generation (renewable distributed generation) alters the network configuration and jeopardizes the protection system operation and system stability; for this reason, necessary changes in power system protection philosophy must be achieved. Modern numerical relays offer extraordinary features and fast and accurate methods for spotting and detecting different unbalanced operating conditions and can be used to mitigate the influence of integrating wind distributed generation into distribution network. In this study, an adaptive directional negative protective scheme was implemented in the medium-level distribution network to investigate and evaluate the performance of protection system and introduce new adaptive protective scheme based on negative overcurrent protection to increase the selectivity and sensitivity of the protection system in case of unbalanced faulty conditions. The medium-level distribution network of Libya Eastern electric network had been implemented in ETAP software to address and evaluate the efficiency of the proposed approach.

Penetration Capacity Analysis of Distributed Generation Considering Overcurrent Relay Protection and Flux-Coupling Type FCL

2014 ◽  
Vol 1070-1072 ◽  
pp. 923-928
Author(s):  
Peng Sun ◽  
Ming Wu Luo ◽  
Zhao Xia Sun ◽  
Tian Ci Liu ◽  
Chang Hong Deng ◽  
...  
Keyword(s):  
Distributed Generation ◽  
Rapid Development ◽  
Distribution Network ◽  
Relay Protection ◽  
Negative Influence ◽  
Capacity Analysis ◽  
Fault Current ◽  
Flux Coupling ◽  
Overcurrent Relay ◽  
Coupling Type

In light of the rapid development of the electric power grid, the integrated application of distributed generation (DG) units can be considered as a key driver. Nevertheless, along with large number of DG units are connected into a distribution network, maybe different kinds of effects are accordingly induced. In particular, regarding the configured relay protection, its selectivity and sensitivity may be affected. In this paper, the penetration capacity analysis of DG considering overcurrent relay protection and flux-coupling type FCL is conducted. Under different fault conditions, the theoretical impacts of introducing DG on the fault current are investigated, and a flux-coupling type FCL is suggested to limit the fault current and potentially enhance the DG’s access capacity. Furthermore, the detailed simulation model of a typical distribution network integrated with the DG and FCL is created. From the simulation results, the employment of the FCL can effectively reduce the fault current’s negative influence on the DG, and improve the DG’s access capacity to a certain extent.

scholarly journals An Improved Directional Relay Adapted to a Distribution Network with IIG Integration

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3345 ◽  
Author(s):  
Yifan Zhu ◽  
Tao Zheng ◽  
Minghao Wang ◽  
Hongcheng Zhao ◽  
Xingguo Wang
Keyword(s):  
Distributed Generation ◽  
Radial Distribution ◽  
Control Strategies ◽  
Distribution Network ◽  
Relay Protection ◽  
Source Distribution ◽  
Positive Sequence ◽  
Simulation Experiments ◽  
Directional Relay

The integration of distributed generation (DG) into a distribution network changes the network’s topology. Three-stage current protection for a radial distribution network cannot meet the requirements of relay protection for a distribution network with DG. A directional relay that is based on the positive sequence fault component (PSFC) can effectively identify faults in the positive and negative directions and can be used to solve the adaptability problem with three-stage current protection in a multi-source distribution network. However, DG and the traditional generators have different fault characteristics and are affected by different control strategies, which may lower the sensitivity of a directional relay based on the PSFC or even cause mal-operation. Focusing on this problem, this paper proposes an improved directional relay that is adapted to a distribution network with inverter-interfaced generation (IIG) integration. The improved scheme divides the operation zone of the directional relay based on the PSFC into sensitive and insensitive areas. If the result of a phase comparison is located in the insensitive area, further identification is needed according to a comparison of the current amplitudes. Simulation experiments are carried out based on PSCAD/EMTDC, and their results verify the correctness of the proposed scheme.

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