Research On Power Unit On The Thyristor Switched Capacitor (TSC)

With the rapid increase of the emotional load in the low-voltage electricity distribution systems, Power systems need more and more reactive current, in order to improve the quality and efficiency of electricity supply, Power systems must be compensation. Thyristor Switched Capacitor (TSC) of is a simple compensator and has been widely used. But the lack of capacitor switching switch in the Reactive Power Compensation Device affected the development of Reactive Power Compensation Device since long years ago, such as short life, big swith impulsion. Consequently, research and develop of electronic switching power unit which is large capacity, fast and multi-functions will be the main content of research, there is high practical value.First of all, this dissertation reviewed the history of the development of switches, And indicates their advantages and disadvantages. expounded the basic working principle and the main circuit composition and means of implementation of Thyristor Switched Capacitor (TSC).Secondly, the advance advances the concept of power unit, And introduced its composition, functions and role, the research of the various components of the power unit is carried out in it. The content chiefly include the system voltage and current selection of thyristor model, designed the zero-crossing trigger module in accordance with the principle of analysis to TSC-free transition process, designed work instructions circuits and fault detection circuit on multi-function card Using compensation capacitor voltage waveform on the work, stringed temperature switch into the control signal and the cooling fan circuit accordance with the protection of the characteristics of the TSC, it played a protective role on the power unit play at high temperature. And manufacture the power units on the basic of the theory and design parameters.the experiments are performanced on the power unit at the existing TSC compensated installation, The experimental results show that the thesis design power unit can achieve very good Switched Capacitor role, Also achieve a variety of conservation and display, Improve the efficiency and compensation effects.Finally, expounds the power unit as integrated switch module in the area of reactive power compensation of the superiority systematically, and pointed out that the lack of design.