Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
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DSP implementation <strong>of</strong> <strong>DTC</strong>-<strong>SVM</strong> control<br />
Experimental results presented in Figures 7.22-7.29 well confirm the effectiveness <strong>of</strong><br />
developed controller synthesis methodology and proper operation <strong>of</strong> speed control loop<br />
for parallel <strong>DTC</strong>-<strong>SVM</strong> structure.<br />
Sensorless speed operation<br />
Dynamic tests for the speed control loop <strong>with</strong>out motion sensor were measured for<br />
sampling time T = 200µ<br />
s. Please note that the digital speed controller parameters were<br />
s<br />
selected exactly like for operation <strong>with</strong> speed sensor according to Table 5.5 (see<br />
Chapter 5.4).<br />
The results <strong>of</strong> speed estimator dynamic test are presented in Fig. 7.30. In this test speed<br />
controller operates <strong>with</strong> the encoder signal in feedback and speed estimator works in<br />
open loop fashion.<br />
Figure 7.30. Experimental dynamic test <strong>of</strong> the speed estimation. Speed reversal Ω =± 300rpm<br />
From the top: 1- reference speed (180rpm/div), 2- measured speed (180rpm/div), 3 - estimated<br />
speed (180rpm/div), 4- error <strong>of</strong> estimated speed (5%/div).<br />
m<br />
The typical dynamic performance tests <strong>of</strong> sensorless <strong>DTC</strong>-<strong>SVM</strong> drive has been<br />
illustrated in Fig. 7.31-7.36. Start up and breaking to zero speed for different speed level<br />
are shown in Fig. 7.31 and 7.33. Also, the speed reversal for low (Fig. 7.32) and<br />
nominal (Fig. 7.34) speed are presented. The half load torque step change tests are<br />
shown in Fig. 7.36 and 7.37.<br />
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