The first output to be investigated is the pilot gas fuel valve as illustrated in Fig. \ref{fig:18}. The actual data lies in 0.55 p.u opening, and the simulated data is projected very close to it.
The second output is the main gas fuel valve comparison as in Fig. \ref{fig:19}. The simulated trend exhibits a good estimation of the actual trend with only a small deviation. As both of the trends are compared, the pilot gas fuel valve remains constant at 0.55 for DLE mode but the main gas fuel valve is modulated according to the load demand in Fig. \ref{fig:16}.
The third output from the simulation is the engine fuel flow as shown in Fig. \ref{fig:20}. The simulated signal captures the same trend of the actual signal and indicates its capability to represent DLE gas turbine operation. The signals imitate the load signal according to the gas turbine operation; which increases the fuel flow demand when the load increases.
Last output to be studied is the thermocouple temperature. This output also crucial in a DLE gas turbine due to the rigid control of the temperature that must lie in the targeted temperature zone to reduce the emission. The temperature of the gas turbine is closely monitored during the operation compared to the conventional gas turbine that normally unattended. The result of the simulated temperature is illustrated in Fig. \ref{fig:21}. A good fit of the simulated temperature profile is observed from the trend. This indicates that the introduction of the pilot and main gas fuel valves does not deteriorate the performance of the temperature profile of the DLE gas turbine.
The simulation outputs are further analyzed in term of MAE and RMSE and the results are tabulated in Table \ref{tab:6}. Main gas fuel valve, pilot gas fuel valve and temperature average signals exhibits very high accuracy with an error less than 0.1 for both MAE and RMSE. Engine gas fuel flow carried quite high error compared to the three signals with MAE 1.644 and RMSE 17.85. This is due to the inheritance error from pilot and main gas fuel valve that carries into the engine fuel flow measurement. However, the signal performance is still acceptable for this study due to the good trend fit to the actual signal. The error analysis proves that the simulated signals are accurate enough to represent the real DLE gas turbine operation.