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Research and Design of Self-Powered Drive System for SCR in Front-Converter of High-Voltage Inverter

Author: GaoZhuo
Tutor: ZhangQingFan
School: Shandong University
Course: Power Electronics and Power Drives
Keywords: High-voltage inverter Thyristor drive Self-powered system High commutation Light control thyristor
CLC: TN344
Type: Master's thesis
Year: 2009
Downloads: 328
Quote: 2
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Abstract

With the development of power electronics technology, high-pressure the commutation equipment in industrial applications is increasingly widespread. Increasing the voltage and current of the core components thyristor (SCR) (more 10KV/10KA) applications are increasingly high requirements. In the international arena, the light control thyristor technology development is increasingly mature. Based on the outlook for the domestic the thyristor technology development prospects and demand, this paper uses a self-powered drive technology with light-control technology, combining R \u0026 D the light control self-powered thyristor drive control panel, then the thyristor body combined to form light control thyristor works implementation model, which can be used as light control thyristor alternative technology. Light control thyristor typical applications in engineering applications, for a four-quadrant high-voltage inverter and large national and DC power transmission system, etc.. With the implementation of the national energy-saving projects, the range of applications of the high-voltage inverter is more and more widely, has become an important part of the industrial energy efficiency. HVDC converter system is difficult and complex technical requirements, this thesis light control thyristor alternative technologies only as one of its reserves. Focuses on the papers as the background of the application of alternative technologies in the light control thyristor current source-type high-voltage inverter. The high-voltage current source inverter in order to improve the single-machine capacity, is the number of SCRs used in tandem. With increasing system capacity, the device of the high-voltage switching devices are increasingly high requirements. If a SCR in a series in the SCR of the conduction no conduction, then the voltage applied to the group SCR will add to the SCR formed over voltage, causing the breakdown of the device damage, and even a group of series SCR are burned. In order to overcome the above problems, to ensure that the high-voltage inverter series thyristor can be safe and reliable work, improve system reliability, it is necessary to back-up drive system with thyristor. This paper proposes the creation of a self-powered drive system - SPDS (Self-Powered Drive System) solution to the SCR drive circuit. SPDS basic function is taken through the high performance circuits to use the energy of the RC snubber circuit monitoring circuit and a back-up trigger circuit to provide normal work of energy required. Its advantage is that the same potential as the buffer circuit thyristor voltage isolation level of self-powered drive system requirements can be reduced from several thousand volts to several hundred volts, to save a high-voltage isolation transformer, saving cost and size, improve system reliability . Already have in-depth study abroad related content, and its application in the high-voltage inverter products. In the country, yet to be found in the relevant literature. For high-voltage current source type inverter thyristor-based design of a high-voltage thyristor self-powered drive system, to fill the gaps, self-powered drive system developed to promote the use of self-powered drive systems and other high-voltage switching devices a reference. This paper describes a series of voltage thyristor drive system requirements and RC snubber circuit characteristics, then presents the the the SPDS works and the concrete implementation of the composition and functions of the various parts of the SPDS. The SPDS core technology is taken can loop and trigger design. In this paper, on the basis of the advantages and disadvantages compare various high pressure to take the way of energy and trigger opted the RC snubber take the way of energy and fiber trigger. The principle thesis based Multisim10 simulation software, take the self-powered drive system combined with high-voltage thyristor can circuit, the core part of the self-powered drive system for high-voltage thyristor - SPDS Energy Extracting circuit simulation. Taken by structures with SPDS can circuit the front side of the single-phase thyristor simulation circuit and current source of high voltage frequency converter circuit simulation model, a detailed discussion of the impact of the RC take the circuit the normal work of a variety of factors. Meanwhile, by setting the parameters of the simulation circuit, analyzes the status of their work. Simulation waveform diagram obtained prove that the high-voltage Transistor Self-powered drive system can achieve the design goal, the valid trigger thyristor having a feasibility. In order to investigate the performance of the SPDS actual work to build a simple SPDS low hardware experimental platform, and lay the foundation for its engineering applications under high-pressure conditions. In the last, the development direction of the self-powered drive system for high-voltage thyristor prospect.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Thyristor ( SCR ) > Control circuit
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