Two-Stage Fault Diagnosis Method Based on the Extension Theory for PV Power Systems

Table 2

Fault categories of photovoltaic array.

Fault categories	Fault reasons
PF1	Normal
PF2	One module is broken in solar power array
PF3	Two modules are broken in solar power array
PF4	Three modules are broken in solar power array
PF5	Over three modules are broken in solar power array
PF6	25% shelter failure occurs in photovoltaic array
PF7	50% shelter failure occurs in photovoltaic array
PF8	75% shelter failure occurs in photovoltaic array