  Time-varying multivariate statistical process control (TMSPC) has been
proposed as a tool for process monitoring, fault detecting & diagnosing of
time-varying system. It is a modification of multivariate statistical process
control (MSPC) of which is designed for the process that variables operated on
normal operational condition which independence of time. However, in some
processes, such as solar photovoltaic system, the process variables, i.e.,
temperature, voltage and current, are time-varying. Therefore, TMSPC has been
proposed as monitoring and diagnosing tool for time-varying process. The
proposed technique has been demonstrated with solar photovoltaic system located
at Research & Development Institute, Nakhon Phanom University, Thailand
(RDI-NPU).
