FAULT DIAGNOSIS METHOD OF GRID-CONNECTED PHOTOVOLTAIC SYSTEM AND APPARATUS THEREOF

摘要

According to an aspect of the present invention for achieving the object as described above, using equivalent operating time concept Diagnostic methods of grid-connected solar power systems, each running time equivalent DC power, AC power, and solar radiation intensity values of the solar system (Y _{P , Meas} , Y _{A, Meas} , Y _{R , Convert to Meas} ) by calculating the equivalent operating hours (Y _{P , Meas} , Y _{A , Meas} , Y _{R , Meas} ), surface temperature (T of the PV array _{M , Meas} ) and direct current (I of the PV array _{A , Meas} ) on the basis of the surface temperature (T PV array _{M , Esti} ), solar equivalent uptime of photovoltaic systems (Y _{P , Esti} ), equivalent uptime (Y in PV array _{A , Esti} ), solar equivalent operating hours (Y _{R , Esti} ) and direct current of the PV array (I _{A , Esti} ) the estimation step, the equivalent operation of the solar power system time of the estimate (Y _{P, Esti} , Y _{A, Esti} , Y _{R, Esti} , I _{A , the Esti} , T _{M , Esti} ) and each of the equivalent uptime The actual output (Y _{P , Meas} , Y _{A , Meas} , Y _{R, Meas} , I _{A , Meas} , T _{M , Meas} difference of ) (Y _{P , Resi} , Y _{A , Resi} , Y _{R , Resi} , I _{A , Resi} , T _{M , Resi} ) calculating the equivalent aspect uptime (Y _{R , Meas} ), the difference value and the solar power system up-time equivalent (Y _{P , Meas} ) comparing the pre-set criteria are stored in the fault / or more databases, and the step of the comparison if it meets the predetermined standards through a step of outputting the failure mode of the PV system. ;