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Optimization and Software Development of Distribution Network Relay Protection System

Author: YangShanShan
Tutor: PanZhenCun
School: Shandong University
Course: Proceedings of the
Keywords: Setting Calculation Distribution network Line Protection Transformer protection VC
CLC: TM77
Type: Master's thesis
Year: 2008
Downloads: 350
Quote: 0
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Abstract


Relay protection as an important part of power production safety system, to ensure the security of the power system, stable, reliable and economic operation plays an important role. Performance of protection devices action, not only closely related to their use of the principle of design, but also its configuration and tuning is closely related. Distribution network at the end of the power system, power transmission link directly bear on the user's power supply, the level of safe operation directly affect the quality of power supply to the user. Therefore, according to the actual structure of the grid, parameters and demand, the relay distribution network optimization, tuning and configuration to improve the distribution network protection has important implications, both in theory and in practice. With the increasing complexity of the grid structure, relay protection setting calculation of technical difficulty and workload. Past mainly rely on manual setting calculation supported by a dedicated computational tools, computationally intensive, long computation time and low computational precision, has been unable to meet the production needs. With the development of computer technology and its popularity in the field of scientific research, production and use of computer software for protection setting calculation has become a trend. Research and development of a practical distribution system relay protection setting calculation software is to improve the distribution system protection operation management level, effective means to improve labor productivity. This paper first analyzes the importance of mine power supply system protection to Yankuang Group Xinglongzhuang coal supply system, for example, reference by PSASP short-circuit current data system modeling calculated for the deficiencies of the existing relay optimized tuning programs. Combination of the particularity of the mine power supply systems, improved on each section of the three-stage protection. Optimized program enables protection to best meet the requirements, reduce the rate of accidents. The combination of a typical system model calculation results in improved selectivity, speed, continuity, reliability and sensitivity of the four aspects of analysis and evaluation of the rationality and superiority of the optimization program. This paper the development of distribution system protection setting calculation software, Microsoft VisualC MFC development environment, to optimize the distribution system based relay protection setting, the whole program is based on the dialog box. The software enables graphical editing environment modeling, text mode, short-circuit current calculation, as well as a variety of transformer and line type of protection setting calculations under various tuning principles. The calculation results can be saved excel file saved, and can be read at any time in the program. The instances Analysis module diagram for the Xinglong Mine typical system, the visual display of each segment of the line protection types, user-friendly figure area via mouse click to select the type of protection setting calculations done automatically. Finally, the paper discusses the feasibility of changing the existing protection configuration, speed cut protection and other protective devices in the system compared to the feasibility of the application of network-based protection, and voltage protection.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection
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