| CPC H02P 21/0017 (2013.01) [H02K 11/33 (2016.01); H02P 21/141 (2013.01); H02P 21/20 (2016.02); H02P 21/30 (2016.02); H02P 27/06 (2013.01); H02P 2207/01 (2013.01)] | 5 Claims |
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1. A printed board circuit mounted device for reducing computation time for model predictive control (MPC) of a 5 level dual T-type multilevel converter, comprising:
a printed circuit board connected to a three-phase open ends induction motor (OEIM) having first, second and third parallel phase paths connected between a first end and a second end,
wherein the printed circuit board comprises, mounted thereon:
a first three-level T-type converter connected to the first end of the OEIM and a second three-level T-type converter connected to the second end of the OEIM, each three-level T-type converter including a combination of horizontal controllable switches and vertical controllable switches;
a first voltage source block connected to the first converter and a second voltage source block connected to the second converter, each voltage source block including a first film capacitor in series with a second film capacitor, wherein each voltage source block has a positive connector, a negative connector and a common connector;
wherein each three-level T-type converter includes:
first, second and third phase legs, each phase leg including:
first and second series connected switches, wherein the first switch is connected to the common connector and the second switch is connected to a terminal of one of the phase paths;
a third switch connected between the positive connector and the terminal of the one of the phase paths and a fourth switch connected to the negative connector and the terminal of the one of the phase paths;
wherein each switch is a SiC MOSFET semiconductor switch in parallel with a diode,
wherein the diodes of the first and second series connected switches are antiparallel to each other;
wherein the diodes of the third and fourth switches are parallel to each other;
a plurality of sensors configured for measuring system parameters; and
control circuitry connected to the switches of each three-level T-type converter and the plurality of sensors, the control circuitry having program instructions stored within that, when executed by one or more processors, cause the one or more processors to determine a reduced set of switching states which reduce the computation time for model predictive control of the converter switches,
wherein the program instructions are configured to:
determine a set of switching states of the plurality of converter switches;
select the reduced set of switching states from the set of switching states;
calculate a set of cost functions which include motor fluxes, motor torques, common mode voltage and capacity or voltages for each switching state of the reduced set of switching states;
sum the set of cost functions to generate a first set of summed cost functions;
minimize the first set of summed cost functions;
identify a voltage vector which minimizes the first set of summed cost functions;
generate a plurality of gating signals for the plurality of silicon carbide semiconductor switches using the voltage vector;
apply the plurality of gating signals to the plurality of switches to operate the OEIM with reduced motor flux ripples, motor torque ripples and balanced capacitor voltages;
wherein calculating the set of cost functions with the reduced set of switching states reduces the computation time for model predictive control of the converter switches.
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