| Title |
Stability Improvement of Output Voltage Control on the Power Supply for Railways |
| Abstract |
This paper describes on the stability improvement of output voltage control on the power supply for railway. On the transient states such as input voltage sudden change, the input and output voltage become unstable by L-C resonance occurred due to constant output voltage control. In this paper, the new damping circuit for system stability is proposed, and control method using band attenuated filter and food-forward terms is introduced. The proposed damping circuit is composed with small size R-L. Also, the 3 level PWM method is adopted to decrease distortion of output voltage. The output voltage is controlled with variation under 10% without oscillation at transient states and have total harmonic distortion under 3%. |