In view of harmonics and reactive power problems caused by electric locomotive load at 27.5 kV electrified railway system

a kind of novel power quality conditioner based on multiple H-bridges with photovoltaic power is proposed. A hybrid cascaded 81-level converter in series with a PWM converter can achieve a high-voltage and large-capacity power quality conditioner

and photovoltaic power connects with the DC bus side of the hybrid cascaded 81-level converter to reduce power consumption. The fundamental voltage of the 81-level converter is controlled by traction network. The active component of the PWM converter output current is controlled by DC link voltage of the 81-level converter

and its reactive and harmonic components are controlled by the load. Throughout the analysis of the system structure

operating principle

power distribution and control method of the novel power quality regulator

the modeling and simulation are implemented in Matlab/Simulink and both feasibility and effectiveness of the proposal is verified.