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The Development on Relay Protection System in High Voltage Converter

Author: LiBing
Tutor: YinXiangGen
School: Huazhong University of Science and Technology
Course: Proceedings of the
Keywords: High voltage inverter Microcomputer Protection Transformer protection DC circuit protection Inverter circuit protection
CLC: TM774
Type: Master's thesis
Year: 2006
Downloads: 363
Quote: 1
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Abstract


With the power electronics technology, the rapid development of computer control technology, AC variable speed replace DC speed control has become a trend. AC variable speed frequency control its excellent speed performance and energy-efficient, and a wide range of applications at home and abroad that the most promising governor to receive widespread attention at home and abroad. Relay high frequency control system is the core and foundation for the protection of the safe operation of the inverter, so far, the protective function of the high frequency control system is relatively weak, mainly for the protection of power electronic devices, it remains difficult to meet the high frequency control the practical application of the system requirements. Therefore, the research and development of high-performance high frequency control protection system has important practical significance and broad application prospects. This paper introduces the principle of high frequency control its power system, and then reviews the domestic and foreign high-voltage inverter and related protection status and development direction. Introduces the main circuit of the three-level high frequency control structure based on the characteristics and possible failure of the three-level structure of the high-voltage inverter, the overall design of a complete set of high-voltage frequency protection system input transformer, the DC circuit, inverter to achieve a comprehensive and effective protection. This paper discusses in detail the design principles of the protection system, hardware and software systems design, functional configuration characteristics, as well as the basic protection principles. According to the application requirements of the high-voltage the VVVF protection system, the design of the hardware system. Layered hardware structure design of hardware structure design, introduced lower Machine selection and characteristics of DSP platform of the main peripheral plug-ins, such as AC conversion plug DC conversion plug-in, open into the turn connectors and protection out of the plug-ins and other design features to do a more detailed description and schematic circuit. Due to the complex structure of the high frequency control system, and involve a variety of the different nature of the frequency AC, DC and variable frequency AC electrical quantity signal, its protective function configuration and realization method are quite different with conventional electricity equipment protection. According to this feature, the paper on the realization of the principle of the protection of high-voltage frequency system, especially with regard to the frequency of the output side of the time-varying characteristics, variable data window Fourier algorithm to solve the fundamental frequency inverter case The components of the calculation problem. The paper describes the method of calculation of the main parameters of the basic principle of \Protection software has a clear structure based on the protection logic diagram of a modular design method, in order to improve the reliability and scalability of the program, to enhance the portability and readability of the program, the software implementation of the protection system using maintenance convenient, accident analysis of the advantages of easy. This paper introduces the basic idea of ??the software design and structure of the program, as well as protection logic to determine the parameters calculated, time relays, fault recorder software module. High frequency control protection system development is complete, the device static test and testing, including functional testing of device performance testing and protection software, the paper describes the main test content and results. The tests show that the reliable device hardware and software performance, the protection function of the design requirements of the system.

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