Analysis And Research On Impact Of TCSC On The Protection Of Transmission Lines

Thyristor controlled series compensation is proposed to solve the existing power system stability。Thyristor controlled series compensation is an important component of flexible AC transmission system in the application of impedance compensation, and to achieve smooth control of the impedance. Thyristor controlled series compensation devices using different ports of firing angle of thyristor control on the bypass capacitor, input or part of the modulation, Thyristor controlled series compensation device can adjust quickly and smoothly in the transmission line in series with the effective capacitance value, so as to improve transmission capacity system and flexible control system trends, the purpose of improving the system transient stability.Thyristor controlled series compensation has an irreplaceable role in System stable. But its introduction, not only changes the line parameters, and the action of its body protection system, but also changes the line during the fault structure, further increasing t the protection system to determine the difficulty and complexity of fault. Therefore, how to solve the series capacitor compensation on the impact of transmission line protection, with a very important theoretical and practical significance.This paper describes the structural characteristics, the working principle, operation mode and basic characteristics of thyristor controlled series compensation, and detailed analysis the work characteristics of the compensation line with series capacitor compensation. Based on the above, this paper analysis the Influence of thyristor controlled series compensation on the transmission lines protection and finally give a brief introduction of the thyristor controlled series compensation control.