6.4.2 INCR_BUILD 2: Closed Current Loop

In this build, BUILD 2, the inner current loop is closed, that is, the inductor current is controlled using a current compensator Gi. Both DC bus and output voltage feedforward are applied to the output of this current compensator to generate the duty cycle of the inverter, as shown in Equation 13. This action makes the plant for the current compensator simple, and a proportional (P) controller can be used to tune the loop of the inner current. The model for the current loop was derived in Section 3.2.

Equation 13.

Complete software diagram for this build as illustrated in Figure 27.

Figure 27. Build Level 2 Control Software Diagram: Closed Current Loop