US 12,328,084 B2
Propulsion controller and method of controlling filter capacitor voltage
Atsushi Oka, Tokyo (JP); and Yu Takaira, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/568,381
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 12, 2021, PCT No. PCT/JP2021/026121
§ 371(c)(1), (2) Date Dec. 8, 2023,
PCT Pub. No. WO2023/286122, PCT Pub. Date Jan. 19, 2023.
Prior Publication US 2024/0275323 A1, Aug. 15, 2024
Int. Cl. H02P 27/08 (2006.01); B61L 15/00 (2006.01); H03H 7/06 (2006.01)
CPC H02P 27/08 (2013.01) [B61L 15/0058 (2024.01); H03H 7/06 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A propulsion controller, comprising:
a filter capacitor configured to smooth a voltage of power supplied from an overhead contact line via a line breaker;
an inverter configured to apply an alternating-current voltage at a variable voltage and a variable frequency to a main motor to be installed to a railway vehicle by pulse width modulation control including an asynchronous mode and a synchronous mode, the inverter being connected in parallel with the filter capacitor;
a power consumption circuit including a switching element and a power consumption resistor connected in series with the switching element, the power consumption circuit being connected in parallel with the inverter; and
a controller configured to perform:
a mode switching control switching between the asynchronous mode and the synchronous mode, on a basis of a filter capacitor voltage that is a voltage of the filter capacitor and a main motor speed that is a rotational speed of the main motor; and
a power consumption control causing the power consumption resistor configured to consume regenerative power generated when the main motor operates as a generator, wherein
the controller is configured to control an operating point, where the asynchronous mode and the synchronous mode are switched, to a desired position by changing a target value of the filter capacitor voltage controlled by the power consumption control.