• J. Bharathi1 A.
• Surya Prakash Reddy C.
• Ashiya Begum
• C. Raviteja
• Ch. Sai Preethi, M.S.Sujatha, S.Sreelakshmi

Generally high speed rails are run by single phase 25kv AC traction power supply system. Here rail acts as a load therefore it draws a large amount of unbalanced inductive power from the two phases of the grid through the traction transformer at neutral section. Then, it leads to several problems like unbalanced voltage, reactive power existence and high Total Harmonic Distortion (THD). These problems are overcame by using Railway Power Conditioner (RPC) or Hybrid Power Quality Conditioner (HPQC). Modular Multilevel Converter(MMC) based Asymmetrical Three-leg Hybrid Power Quality Conditioner by using phase-shifted Pulse Width Modulation technique is proposed due to the drawback of additional bulky and expensive coupling transformer in HPQC. Here the Asymmetrical Three-leg Hybrid Power Quality Conditioner by using phase-shifted Pulse Width Modulation technique is extended by Alternate Phase Opposition Disposition Pulse Width Modulation technique ,THD analysis for ATHPQC using phase-shifted PWM technique and APOD PWM technique will be examined.

Asymmetric, traction power supply system, hybrid power quality conditioner(HPQC), railway power conditioner(RPC).

"POWER QUALITY IMPROVEMENT IN CO-PHASE TRACTIO POWER SUPPLY SYSTEM BY USING ALTERNATE PHASE OPPOSITION DISPOSITION TECHNIQUE IN ASYMMETRIC THREE-LEG HYBRID POWER QUALITY CONDITIONER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 9, page no.126-133, September-2022, Available :http://www.jetir.org/papers/JETIRFS06021.pdf

"POWER QUALITY IMPROVEMENT IN CO-PHASE TRACTIO POWER SUPPLY SYSTEM BY USING ALTERNATE PHASE OPPOSITION DISPOSITION TECHNIQUE IN ASYMMETRIC THREE-LEG HYBRID POWER QUALITY CONDITIONER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 9, page no. pp126-133, September-2022, Available at : http://www.jetir.org/papers/JETIRFS06021.pdf