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The Microgrid Fault Characteristic Analysis and the Study on Protection Principle

Author: LiangMingHui
Tutor: ZhangZhe
School: Huazhong University of Science and Technology
Course: Proceedings of the
Keywords: Distributed generation Piconet Failure characteristics Protection program
CLC: TM711
Type: Master's thesis
Year: 2011
Downloads: 242
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Abstract


With the energy and environmental issues become increasingly prominent, and how to improve the utilization of renewable energy sources such as wind, solar, and achieve sustainable social and environmental development, has become the most important development of the power industry. Contradictions coordinate grid and distributed power to fully tap the value and benefits of distributed energy grid and users, micro-net technology has attracted widespread attention as an effective form of distributed power. Piconet micro-power, energy storage devices, load control device, both network operation and capable of independent and autonomous operation of regional electricity system. Unlike the traditional distribution network, the micro-structure of the network is no longer a single form of power, the flow distribution in the radial piconet and short-circuit current distribution has greatly changed, use the traditional relay protection, overcurrent protection fault identification and fault location encountered a lot of difficulties, research suitable for micro-network protection strategy is of great practical significance. The the inverter interface micro-power energy supply system consisting of micro network as the object of study, the first to establish a the micro power equivalent calculation model, using Matlab / Simulink based on the establishment of a micro-network simulation platform, micro-network in silos and networking two modes of operation under fault characteristics, so as to the micro-network protection principle and features to provide guidance. Micro network access through the tie-line distribution network, the piconet protection system involving contact line protection and micro-mesh internal protection of two parts. In the piconet contact line protection, the paper first discusses several factors that affect the the piconet island and failure through the operation mode, summed up several common micro-network distribution network isolation strategy, and for different isolation strategies contact line with suitable protection principles and programs. Collate and summarize in the piconet internal protection of the existing micro-network protection strategy, and focus on the low-voltage protection and current differential protection of two protection strategies, analysis of the protection of the principle and implementation of programs and the protective performance has been evaluated. On this basis, this paper presents a part based on the current than the principle of the protection program, the program includes two the piconet feeder protection and micro power protection can complement each other, and in silos and networking two modes of operation can be applied, and using Matlab / Simulink simulation of the proposed protection scheme, and made an evaluation of its protective properties. At the end of this article, a summary of the work done, and pointed out the direction of future research.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Network analysis,power system analysis
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