Propulsion controller and method of controlling filter capacitor voltage
AssigneeMitsubishi Electric Corporation
InventorsAtsushi Oka, Yu Takaira
Life of this patent
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Abstract
A propulsion controller includes a controller that performs mode switching control and power consumption control, on the basis of a filter capacitor voltage and a main motor speed. The mode switching control switches between an asynchronous mode and a synchronous mode. The power consumption control causes power consumption resistor of a brake chopper circuit to consume regenerative power generated when a main motor operates as a generator. The controller controls an operating point, depending on the position of which 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.
Claims5
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.
A method of controlling a filter capacitor voltage applied to a propulsion controller that includes:
- 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, by pulse width modulation control including an asynchronous mode and a synchronous mode, an alternating-current voltage at a variable voltage and a variable frequency to a main motor to be installed to a railway vehicle, the inverter being connected in parallel with the filter capacitor;
- and
- 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, the method comprising:
- setting an operation start voltage of the power consumption circuit to a first target value;
- causing the power consumption resistor configured to consume regenerative power so that a regenerative current, caused by the regenerative power generated when the main motor performs regenerative operation, does not flow back to a side of the overhead contact line;
- opening the line breaker;
- and
- setting the operation start voltage of the power consumption circuit to a second target value larger than the first target value.
Dependencies are inferred from the claim text.