This paper presents a performance analysis of novel doubledamped tuned alternating current (AC) filters in high voltage direct current (HVDC) systems. The proposed double-damped tuned AC filters offer the advantages of improved performance of HVDC systems in terms of better power quality, high power factor, and lower total harmonic distortion (THD). The system under analysis consists of an 878 km long HVDC transmission line connecting converter stations at Matiari and Lahore, two major cities in Pakistan. The main focus of this research is to design a novel AC filter using the equivalent impedance method of two single-tuned and double-damped tuned AC filters. Additionally, the impact of the damping resistor on the AC channel is examined. The THD of the HVDC system with and without current AC filters was also compared in this research and a double-damped tuned AC filter was proposed. The results of the simulation represent that the proposed double-damped tuned AC filter is far smaller in size, offers better power quality, and has a much lower THD compared to the AC filters currently in place in the converter station. The simulation analysis was carried out utilizing power systems computer-aided design (PSCAD) software.

This paper presents the concept of the creation of gasses inside the transformer oil and the fault produced inside the transformer is examined. Focusing on the issue of numerous trademark gases surpassing the norm in a 500 kV transformer oil, this paper dissects the issues keeping in view the trademark gas strategy and three-ratio technique and joined with prior tests, it was decided that the single-phase converter transformer Pole 1-YDA. The on-location review proves the rightness of the disappointment investigation results and the corresponding measures were taken on to dispense with the transformer flaws. Key Words: Converter Transformers, DGA, HVDC, Internal Faults.