IEEE Power Electronics Magazine - September 2020 - 58
(a)
(b)
FIG 10 A sustainable, portable, and efficient electricity delivery (SPEED) system built with the Kit. (a) Front and (b) back
view. (Source: Texas Tech University; used with permission.)
regulated through d-q voltages ud and uq, respectively. For a
surface-mount PMSM, there is a linear relationship between
the electromagnetic torque Te and the q-axis current iq as
Te = k T i q so the current reference i )d can be calculated
through the torque reference as i )d = _ T e) k T i in the torque
control mode or generated through the speed PI controller
in the speed control mode. The d-axis current reference i )d
can be set as 0 to fulfill the maximum torque per ampere
(MTPA) requirement. More information about the coefficient kT can be found in [7]. The PI control of the d-q currents
generates the voltages ud and uq, which are converted to six
space-vector pulse width modulation (SVPWM) signals to
drive IGBT after inverse-Park and inverse-Clarke transformations and an SVPWM signal generator. More information
about PMSM and vector control can be found in [8].
The main controller shown in Figure 7 together with additional ADC measurements, QEP measurement, DAC
outputs, and protection functions can be implemented in
MATLAB/Simulink and directly downloaded to the TI C2000
TMS320F28335 ControlCARD for execution. A video of the
PMSM control based on the Kit can be found in [9].
Note that the rotor position angle is required for both
the Park and inverse-Park transformations. Through the
built-in ABI incremental encoder of the PMSM and the
QEP decoder on the Kit, the rotor position can be obtained
after compensating the initial rotor position offset. Thanks
to the DAC function of the Kit, this can be done with ease.
Based on the characteristics of the PMSM, the initial rotor
position offset of the PMSM is the intersection point of back
EMF vab and vca when the signal vab - vca crosses zero from
positive to negative. It can be calibrated as follows:
180 W PV
System
Human Machine
Interface
120 Vrms, 60 Hz
ac Output
1.8 kWh
Battery
SYNDEM Smart Grid
Research and Educational Kit
FIG 11 Structure of the SPEED system [10]. (Source: Texas Tech University; used with permission.)
58
IEEE POWER ELECTRONICS MAGAZINE
z September 2020
IEEE Power Electronics Magazine - September 2020
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