5.2.2. Reactive Power Priority

To test this control, two references of reactive power are simulated: (i) *Qref* = −0.8 p.u and (ii) *Qref* = 0.8 p.u For the first reference (absorption of reactive power), the results of active and reactive power are illustrated in Figure 27 with the corresponding capability curve. In this case, the PV generator absorbs a value of reactive power equal to its reference almost all the time. Due to the changes of irradiance and the response time of the control, there are specific times where there is an error around 0.05 p.u. Because of the control and the ambient conditions, the active power is limited to 0.6 p.u between the hours 08:00 to 13:00.

For the second reference (injection of reactive power), two different modulation index are tested: (i) *M* = 1 and (ii) *M* = 1.75 (Figures 28 and 29). When *M* = 1, the reactive power cannot reach the reference of reactive power and stays at the maximum value (0.45 p.u). In the case *M* = 1.75, the PV generator injects a reactive power equal to the reference during all the time by the reduction of active power from 09:00 to 13:30.

**Figure 27.** QPPT response when a reactive power reference is applied (**a**) Active power, (**b**) Reactive power, and (**c**) Operational area.

**Figure 28.** Power response with QPPT for *M* = 1 (**a**) Active power and (**b**) Reactive power, and (**c**) Operational area.

**Figure 29.** Power response with QPPC for *M* = 1.75 (**a**) Active power and (**b**) Reactive power, and (**c**) Operational area.
