The state of combustion oscillation in the combustor of a turbine of a
power plant is monitored from a remote monitoring center. To monitor the
combustion oscillation state, combustion oscillation data on the combustor
is separated into two types of data: the first data obtained on a
real-time basis, and the second data including representative values
within a predetermined period of time obtained from the first data. In the
normal state, a low-speed communications mode is used to send the second
data, which is monitored at the monitoring center. If an abnormal state is
predicted as a result of monitoring the second data, the high-speed
communications mode is used to send the first data, and more detailed
combustion oscillation data is monitored at the monitoring center. When a
critical state is predicted, an instruction is sent to the local site to
switch the operation mode over to the low load operation mode.
