Pantograph Detachment Detector and Control Scheme for a PWM rectifier Considering Pantograph Detachement Condition

전동차용 PWM 정류기를 위한 집전기(pantograph) 접점상태 검출방법 및 비접촉상태를 고려한 PWM 정류기 제어기법

The pantograph contact can be disrupted due to irregularities in the motion. The pantograph detachment prohibits the current flow and makes the system uncontrollable. During the pantograph detachment period, the control error are accumulated by the integral property of the controller. The output of the controller, therefore, can be induced to be an extremely large value. When the pantograph is reattached, the extremely large output of the controllers causes a very high overshoot (or under-shoot) of the line current and the DC-link voltage. This work proposes a new method for detecting the pantograph bouncing conditions and designs a controller considering such conditions based on the pantograph bouncing detector.