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4. Automatic Supervision Strategies 237

FIGURE 7.2
Supervision and diagnosis procedure.

The PV system supervision and diagnosis procedure has, as input data, the
set of climatic parameters obtained from the monitoring system or from fore-
casting techniques and the set of electrical parameters both DC and AC: current,
voltage, and power, normally given by the inverter present in the PV system.
Fig. 7.2 shows the flowchart of the supervision and diagnosis procedure. At the first
level, the supervision algorithm evaluates the behavior of the PV system taking
into account the input data. Once an abnormal behavior is observed, a fault is
detected in the PV system. At this point, the diagnosis algorithm starts running
and tries to identify the most probable cause of the fault detected by the supervi-
sion algorithm.

4. AUTOMATIC SUPERVISION STRATEGIES
As it has been described in the previous section, the supervision system is the pro-
cedure responsible to analyze the behavior of the PV system and detect any fault pre-
sent in the system. Different strategies to achieve this objective exist.
The simplest supervision procedure is based on the evaluation of the energy pro-
duced by the PV system by comparing the production of monitored and expected