In order to avoid disrepair and overrepair

improve the reliability and availability of gas turbine

reduce operation and maintenance cost

and ensure its safe

stable

green and efficient operation

a novel approach is proposed for fault diagnosis of gas turbine in power plants under transient operating condition with variable geometry compressor. The mathematical relationship of the influence of the compressor inlet guide vane position on compressor flow and efficiency characteristics is deduced. A high-precision thermodynamic model for the purpose of performance analysis and gas-path fault diagnosis is established. Moreover

the gas path fault diagnosis strategy of power plant gas turbine

which is suitable for transient and variable conditions and includes variable geometry

is proposed. Through actual operation test

it is verified that the proposed method has high diagnostic accuracy and good real-time performance

and the fault identification under transient and variable conditions is realized.