Study on Fundamental Impedance of Series Capacitor Controlled by Thyristor

With the development of living and production standard, the power load is increasing continuously, and the distribution network needs to be expanded to meet the expectation, meantime, low user voltage problem frequently appears. Flexible AC Transmission Technology (FACTS) provides a new method for power flow control in grid. Thyristor controlled series capacitor (TCSC) is used in (or above) 10kV transmission and distribution lines to solve the problem of power transmission. In the low-voltage distribution network, it can improve the terminal voltage. But for now, in the practical application of engineering, its control method is not mature enough, some problems like Inaccurate control or complex control steps still exist. In this paper, two possible improvement measures are put forward aiming at TCSC's traditional table check control schemes. more applicable functional relationships are proposed by using mathematical analysis, and the application conditions of the two improvement schemes are compared and analyzed. After theoretical analysis and practical verification, the improved scheme can make up for the shortcomings of the traditional control mode to a certain extent, and can play a better effect in practical application.