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US 10,951,146 B1Granted
Method to improve output current harmonic distribution in a segmented drive system
AssigneeKarma Automotive LLC
InventorsLixin Tang, Geng Niu
Life of this patent
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Abstract
A segmented electrical drive system comprising a DC power bus comprising a DC voltage supply and a capacitor in parallel, an inverter comprising a plurality of inverter segments, a motor including a plurality of stator winding segments each connected to an inverter segment, and a controller. The controller receives a control signal and sends a switching signal to each of the inverter segments, wherein the switching signal is based on a discontinuous space vector pulse width modulation (DSVPWM) scheme for a segmented inverter. The DSVPWM scheme includes a set of reverse sawtooth carrier signals that are at an optimal phase shift angle with respect to each other.
Claims20
A segmented electrical drive system comprising:
- a DC power bus comprising a DC voltage supply and a capacitor connected in parallel with the DC voltage supply;
- an inverter comprising a plurality of inverter segments, wherein each inverter segment includes a plurality of inverter switch pairs each connected in parallel with the DC power bus;
- a motor connected to the inverter, wherein the motor includes a plurality of stator winding segments, wherein a stator winding segment in the plurality of stator winding segments is assigned to each inverter segment, and wherein each stator winding segment includes at least one stator winding for each inverter switch pair in the plurality of inverter switch pairs of the associated inverter segment;
- and
- a controller, wherein the controller receives a control signal and sends a switching signal to each of the inverter segments, wherein the control signal corresponds with a desired stator magnetic field vector, wherein the switching signal sent to each inverter segment corresponds with a space vector pulse width modulation (SVPWM) used to produce the desired stator magnetic field vector by means of combining a plurality of base vectors produced by the plurality of stator winding segments, wherein each base vector is produced by an inverter switch pair's activity to generate a pulse width modulated signal according to a SVPWM schedule through its corresponding at least one stator winding, and wherein at least one stator winding in the plurality of stator winding segments is not driven by any inverter switch pair activity from its corresponding inverter switch pair during a given cycle of the SVPWM schedule;
- wherein the switching signal to produce the pulse width modulated signal of each inverter switch pair is determined by comparing a carrier signal to a reference signal.
3 more elements
A vehicle including a segmented electrical drive system, the drive system comprising:
- a DC power bus comprising a DC voltage supply and a capacitor connected in parallel with the DC voltage supply;
- an inverter comprising a plurality of inverter segments, wherein each inverter segment includes a plurality of inverter switch pairs each connected in parallel with the DC power bus;
- a motor connected to the inverter, wherein the motor includes a plurality of stator winding segments, wherein a stator winding segment in the plurality of stator winding segments is assigned to each inverter segment, and wherein each stator winding segment includes at least one stator winding for each inverter switch pair in the plurality of inverter switch pairs of the associated inverter segment;
- and
- a controller, wherein the controller receives a control signal and sends a switching signal to each of the inverter segments, wherein the control signal corresponds with a desired stator magnetic field vector, wherein the switching signal sent to each inverter segment corresponds with a space vector pulse width modulation (SVPWM) used to produce the desired stator magnetic field vector by means of combining a plurality of base vectors produced by the plurality of stator winding segments, wherein each base vector is produced by an inverter switch pair's activity to generate a pulse width modulated signal according to a SVPWM schedule through its corresponding at least one stator winding, and wherein at least one stator winding in the plurality of stator winding segments is not driven by any inverter switch pair activity from its corresponding inverter switch pair during a given cycle of the SVPWM schedule;
- wherein the switching signal to produce the pulse width modulated signal of each inverter switch pair is determined by comparing a carrier signal to a reference signal.
3 more elements
A method of operating a segmented electrical drive system, the drive system comprising:
- a DC power bus comprising a DC voltage supply and a capacitor connected in parallel with the DC voltage supply;
- an inverter comprising a plurality of inverter segments, wherein each inverter segment includes a plurality of inverter switch pairs each connected in parallel with the DC power bus;
- a motor connected to the inverter, wherein the motor includes a plurality of stator winding segments, wherein a stator winding segment in the plurality of stator winding segments is assigned to each inverter segment, and wherein each stator winding segment includes at least one stator winding for each inverter switch pair in the plurality of inverter switch pairs of the associated inverter segment;
- and
- a controller, wherein the controller receives a control signal and sends a switching signal to each of the inverter segments, wherein the control signal corresponds with a desired stator magnetic field vector, wherein the switching signal sent to each inverter segment corresponds with a space vector pulse width modulation (SVPWM) used to produce the desired stator magnetic field vector by means of combining a plurality of base vectors produced by the plurality of stator winding segments, wherein each base vector is produced by an inverter switch pair's activity to generate a pulse width modulated signal according to a SVPWM schedule through its corresponding at least one stator winding, and wherein at least one stator winding in the plurality of stator winding segments is not driven by any inverter switch pair activity from its corresponding inverter switch pair during a given cycle of the SVPWM schedule;
- wherein the switching signal to produce the pulse width modulated signal of each inverter switch pair is determined by comparing a carrier signal to a reference signal.
3 more elements
Dependencies are inferred from the claim text.