Evaluation of a Trapezoidal Predictive Controller for a Four-Wire Active Power Filter for Utility Equipment of Metro Railway, Power-Land Substations

Figure 7

(a) Measured supply current waveforms (blue), (yellow), (red), and (green) before and after the activation of the APF with the Euler and Trapezoidal predictive controllers and the load condition of Figure 5(a). (b) Measured supply current waveforms (red), (yellow), (green), and (blue) before and after the activation of the APF with the Euler and trapezoidal predictive controllers and the load condition of Figure 5(b). 127 V, 60 Hz supply, 400 V APF DC link, and 21.6 kHz APF sampling frequency.

(a)

(b)