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LM Gas Turbine Load Accept Guidelines

Introduction The LM Aero Gas turbine provides good load acceptance capability from zero load and partial load for customers who have island load type applications and for starting up balance of plant during black out conditions. This position paper provides load accept capability information for the LM2X, LM6000 and LMS100 products,

Description The GE Aero LM gas turbine products are 2 and 3 shaft type designs with control systems that have very robust fuel control acceleration and deceleration schedules that can maintain decent stall margins. The high-pressure shaft is aerodynamically coupled to the low-pressure shaft; therefore, the AC generator frequency output is controlled via the speed of the low-pressure turbine.

From zero load, the LM2500 and LM6000 can accommodate 6 to 7 MW load acceptance and stay within 5% of 1PU frequency range for 1 to 2 seconds. Larger load acceptance can be accomate by deploying heavy inertia generator rotors. The LMS100 gas turbine, due to its high-pressure ratio and heavy duty fuel schedules, can accommodate 18 to 21 MW load acceptance from zero load.

Load acceptance performance is enhanced when the GT has certain amount of base load connected. During this condition the fuel control valve is tracked off of minimum stop when there is load applied to the GT, which provides the valve with a wider range Therefore, with load applied with base load connected, the GT transient response and recovery is improved.

Reference Figures 1 and 2 for LM2500 load acceptance performance capability curves for 50 and 60 Hz applications respectively. Curves represent typical connected generator inertia load of 700 slug ft^2 and are based on standard ISO day. Recovery time back to 1 PU frequency during load acceptance transients is typically around 2 to 4 seconds.

Reference Figure 3 and 4 for LM6000 load acceptance performance capability curves 50 and 60 Hz applications respectively. Curves represent typical connected generator inertia load of 881 slug ft^2 and are based on standard ISO day. Recovery time back to 1 PU frequency during load acceptance transients is typically around 2 to 4 seconds.

GE Energy Aero Energy Division

Position Paper #50

Rev A

Date: January 16, 2009

16415 Jacintoport Blvd

Houston, TX 77015

USA T 001-281-864-2803

F 001-281-864-2459



Reference Figure 5 and 6 for LMS100 load acceptance performance capability curves with heavy inertia connected load. These plots depict these load acceptance transients with heavy inertia rotor generator application. Typical heavy inertia rotor inertia load connected to LMS100 is 3300 slug ft^2 for Brush model 98-330ER and Hitachi model GH1550A generator offerings.

Reference Figure 7 and 8 for LMS100 load acceptance performance capability curves with low inertia connected load. These plots depict these load acceptance transients with heavy inertia rotor generator application. Typical heavy inertia rotor inertia load connected to LMS100 is 2226 slug ft^2 for Brush 82-445ER generators.

The generator voltage response and recovery is typically 8 to 10 % with recovery to 1 PU within 1 to 2 seconds. If needed, incorporating high voltage PMG or static excitation can accommodate improved generator voltage response.

Conclusion GE Aero can provide dynamic modeling studies of gas turbines during transient loads, acceptance and rejection for site-specific applications. GE Aero can provide special load transient dynamic performance for applications by deploying heavy inertia generators, as needed

References: PP14B, LM6000 Full Load Rejection Guidelines PP36A, LMS100 Full Load Rejection Guidelines



Figure 1, LM2500 Load Acceptance Capability 50 Hz application



Figure 4, LM6000 Estimated Load Acceptance Capability 60 Hz Application



Figure 5, LMS100 Load Acceptance Capability 50 Hz application High Inertia Rotor



Figure 6, LMS100 Load Acceptance Capability 60 Hz application High Inertia Rotor



Figure 7, LMS100 Load Acceptance Capability 50 Hz application Low Inertia Rotor



Figure 8, LMS100 Load Acceptance Capability 60 Hz application Low Inertia Rotor

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