Integrated LC filter design for High Power Charging Systems using 12 Pulse Thyristor Rectifiers

Abstract:
12-pulse thyristor rectifier systems remain a popular choice in high-power electric vehicle (EV) charging infrastructures due to their robustness and cost-effectiveness. Although these systems effectively suppress lower-order harmonics, they still require AC harmonic filters to comply with IEEE-519 standards. However, the inclusion of AC filters introduces additional challenges—notably, increased ripple in the DC-side output voltage due to interactions between the AC harmonic and DC output filters. While previous research has addressed harmonic mitigation and DC ripple reduction individually, a comprehensive approach that considers circulating currents and the filter interaction effects on ripple remains unexplored. This paper proposes a unified approach for the optimal design of LC filters in 12-pulse thyristor rectifier systems. The proposed design is validated through MATLAB Simulink simulations.