The SVC is designed to reduce disturbance caused by changes in voltage variations during normal operation of transmission lines and industrial transmission lines and industrial distribution systems. Disturbances can be caused by line faults or non-linear components such as thyristors and components such as thyristors and rapid variations in active or reactive loads. The SVC injects or absorbs reactive power in the busbar where it is installed, so as to satisfy the reactive power demand of the system. The main problem with these compensators is that the TCR introduces very strong harmonics into the network, resulting in electrical losses or even malfunctions on the electrical supply network. This research work is motivated by the desire to improve the electrical power quality of an industrial system by controlling reactive power and voltages in compliance with Cem standards (IEEE Standard 519-1992). This research describes the method used to study the harmonic performance of the SVC when the TCR is the harmonic source under consideration. The maximum voltage and the harmonic distortion of the current on the 400 kV bus caused by the harmonics generated by the TCR will be calculated. There are several solutions for compensating for these harmonics, including filtering. This solution has been known for a long time. In order to verify the performance of the proposed method, the simulation results obtained for an industrial network with compensation by an SVC without filtering were compared with those obtained with filtering.