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Research on High-Voltage TSC Control Technology

Author: SongYing
Tutor: GaoQiang
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Reactive Power Compensation High-voltage TSC TMS320F2812 Thyristor Series Technology
CLC: TM761
Type: Master's thesis
Year: 2009
Downloads: 89
Quote: 0
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Abstract


High-voltage TSC var compensation device is an important way to compensate the reactive power of the high-voltage electric grid. It has some advantages such as low cost, rapid response, no mechanical abrasion and so on. It can maintain the system voltage, raise the system power factor and improve the power quality effectively. So it’s significant to do research on the high-voltage TSC control technology and promote the application of high-voltage TSC in the domestic power system.In this paper, High-voltage TSC control technology is studied and some new control methods are proposed. (1) To satisfy different application demands, the power factor precedence controlling principle which can guarantee high power factor as the main compensation goal and the maintaining voltage controlling principle which can maintain voltage stability as the main compensation goal are proposed on the basis of traditional improved nine-zone principle. (2) To solve the over-compensation and under-compensation caused by step switching of the conventional TSC compensation device, all the needed capacitors are switched in one time to obtain rapid response. (3) Capacitor duty cycle-scan mode is realized in software, which can avoid the capacitors’life shortening or overheat explosion for long time running in the high-voltage and high-capacity situations. This feature ensures all equivalent capacitors running in turn, and the total compensation is equal. (4) The capacitor feedback mechanism is introduced to get the actual switching status. If the capacitor switching failures caused by the malfunction of the high-voltage thyristor valves or the triggering system happen, the capacitors’switching function will shut down. When the faults are handled, the switching function is recovered automatically.To realize the control algorithm mentioned above, a high-voltage TSC controller based on TMS320F2812 is designed. The hardware platforms including main control system, signal processing, man-machine interface are designed. In terms of software, the functions such as parameter calculation, capacitor switching, malfunction handling, LCD display are realized. Specified for high-voltage main circuit, the thyristor series technology is introduced. Zero-flux current transformers are used to measure the DC and AC components of the voltage of the valve. The voltage-zero testing circuit is composed of amplifier, toggle circuit, gate circuit and so on. A patent high-voltage triggering circuit with high isolation level and excellent trigger synchronization is adopted.A low-voltage experimental platform is built. The result of the experiments indicates that the device can compensate the reactive power accurately, increase the power factor effectively and have good real-time feature. The control algorithm and design proposal in this paper are feasible.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatically adjusts
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