For this study, 0.173 is selected due to low MAE and low RMSE compared to the proposed, 0.172. Two optimum values also observed in main gas fuel valve parameter analysis at 0.222 as proposed and 0.223. However, parameter 0.222 exhibits low RMSE high MAE compared to parameter 0.223 with high RMSE but low MAE. In this scenario, low RMSE is desirable compared to MAE to produce a low variance of the individual errors in the sample. Thus, 0.222 remained as proposed for main gas fuel valve parameter.
This section ends until the valves model are acquired and it is substituted into Rowen’s model to build a DLE gas fuel valve system.

DLE Gas Turbine Fuel System

In this section, the actual representation and operation of pilot and main gas fuel valves were further investigated.
The normal operating behaviour of the valves in the fuel system is presented in Fig. \ref{275614}. The pilot fuel valve opening is averagely at 55% and the main gas fuel valve is at 40% opening. The total opening of the valve is around 95% and this provides a basis ratio for the valve modelling in DLE gas turbine. The ratios of the valves are approximated at 0.45 p.u for the main valve and 0.55 p.u for the pilot gas fuel valve.