lm2500 dynamics

Dynamic analysis and simulation are essential design procedures in the development of control systems for gas turbine power plants. Dynamic analysis requires a mathematical model that simulates the thermodynamic and mechanical processes governing engine operation. The principles of compressible fluid flow, combustion, and work and energy balances can be combined with empirically derived data to formulate a model that will accurately predict the dynamic response to inputs of airflow, fuel flow, steam/water flow (where applicable), variable geometry, exhaust conditions, and load. This is referred to as the Component Level Model (CLM) of the engine. Use of the CLM in conjunction with a mathematical model of the control system and Purchaser-driven equipment representation will provide an analytical tool capable of simulating the response of the gas turbine to driven equipment system dynamics. It is the responsibility of the Purchaser to perform the simulation of anticipated gas turbine and driven-equipment acceleration, load acceptance, load drop, trip, and other system dynamics in order to verify acceptable response. Such analysis can be performed by GE, with an optional Engineering Service charge, based on the Purchaser’s supplied data. Transient response, load rejection capability, is largely affected by the inertia of the driven load. As an initial guide for the designer, Figure 1 provides estimates of maximum power turbine speeds for load rejections from various power levels for various driven load inertias. The analysis was performed for liquid fuel. For gas fuel applications, the peak power turbine speeds should be increased 2%. These predictions can vary significantly depending on the Control System supplier's implementation of the Control requirements. Figure 2 provides estimates of power turbine under speed during various load-on steps for various driven load inertias. The driven load inertia includes the generator and reduction gear, reflected to the power turbine speed. Figure 1. LM2500-PE Estimated Load Rejection Transient Performance Dynamics Characteristics Page 1 of 3 Dynamics 19/11/2005 http://inside-aep.ps.ge.com/insideaep/aep/iad/engine_prod_delv/idms/LM25bssac/secd.ht...

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Use of the CLM in conjunction with a mathematical model of the control system and Purchaser-driven equipment representation will provide an analytical tool capable of simulating the response of the gas turbine to driven equipment system dynamics. It is the responsibility of the Purchaser to perform the simulation of anticipated gas turbine and driven-equipment acceleration, load acceptance, load drop, trip, and other system dynamics in order to verify acceptable response. Such analysis can be performed by GE, with an optional Engineering Service charge, based on the Purchaser’s supplied data.

Transient response, load rejection capability, is largely affected by the inertia of the driven load. As an initial guide for the designer, Figure 1 provides estimates of maximum power turbine speeds for load rejections from various power levels for various driven load inertias. The analysis was performed for liquid fuel. For gas fuel applications, the peak power turbine speeds should be increased 2%. These predictions can vary significantly depending on the Control System supplier's implementation of the Control requirements.

Figure 2 provides estimates of power turbine under speed during various load-on steps for various driven load inertias. The driven load inertia includes the generator and reduction gear, reflected to the power turbine speed.

Figure 1. LM2500-PE Estimated Load Rejection Transient Performance

Dynamics Characteristics

Page 1 of 3Dynamics

19/11/2005http://inside-aep.ps.ge.com/insideaep/aep/iad/engine_prod_delv/idms/LM25bssac/secd.ht...