초록 ▼

A generating plant with improved capacity at high ambient temperatures comprises a gas turbine (32) matched to a generator (26) for summer peaking conditions. The plant includes a system for limiting turbine output at lower ambient temperatures to ensure that the generator or other components are no

A generating plant with improved capacity at high ambient temperatures comprises a gas turbine (32) matched to a generator (26) for summer peaking conditions. The plant includes a system for limiting turbine output at lower ambient temperatures to ensure that the generator or other components are not overloaded. It also preferably includes an evaporative cooler (70) for gas turbine inlet air.

대표청구항 ▼

A generating plant with improved capacity at high ambient temperatures comprises a gas turbine (32) matched to a generator (26) for summer peaking conditions. The plant includes a system for limiting turbine output at lower ambient temperatures to ensure that the generator or other components are no

A generating plant with improved capacity at high ambient temperatures comprises a gas turbine (32) matched to a generator (26) for summer peaking conditions. The plant includes a system for limiting turbine output at lower ambient temperatures to ensure that the generator or other components are not overloaded. It also preferably includes an evaporative cooler (70) for gas turbine inlet air. ure measurement; sensing pressure in the return line to produce a return pressure measurement; sensing a parameter which varies with changes of a force acting on the hydraulic actuator; deriving an equivalent flow coefficient which characterizes fluid flow through the hydraulic circuit and which is derived from the supply pressure measurement, the return pressure measurement, and the parameter; and controlling the fluid in the hydraulic system based on the equivalent flow coefficient. 9. The method as recited in claim 8 wherein determining the parameter comprises sensing a pressure produced by the force acting on the hydraulic actuator. 10. The method as recited in claim 8 wherein the hydraulic actuator has a first port and a second port, and sensing a parameter comprises: sensing pressure at the first port to produce a first port pressure measurement; and sensing pressure at the second port to produce a second port pressure measurement. 11. The method as recited in claim 8 further comprises producing a requested velocity for the hydraulic actuator, and wherein equivalent flow coefficient also is based on the requested velocity. 12. In a hydraulic system having a circuit branch in which a first electrohydraulic proportional valve couples a first port of a hydraulic actuator to a supply line containing pressurized fluid and a second electrohydraulic proportional valve couples a second port of the hydraulic actuator to a return line connected to a tank, a method comprising: sensing pressure in the supply line; sensing pressure in the return line; sensing pressure at the first port; sensing pressure at the second port; deriving an equivalent flow coefficient, Keq, representing fluid conduction of the hydraulic circuit branch, wherein that deriving is based on the pressure in the supply line, the pressure in the return line, the pressure at the first port, and the pressure at the second port; and controlling operation of the circuit branch based on the equivalent flow coefficient. 13. The method as recited in claim 12 wherein controlling operation of the circuit branch comprises activating the first electrohydraulic proportional valve and the second electrohydraulic proportional valve based on the equivalent flow coefficient. 14. The method as recited in claim 12 wherein the hydraulic actuator comprises a cylinder and a piston which defines first and second chambers in the cylinder, wherein the piston has a first surface area in the first chamber and a second surface area in the second chamber. 15. The method as recited in claim 14 wherein the equivalent flow coefficient is derived based on the surface area of the piston in at least one of the first chamber and the second chamber. 16. The method as recited in claim 15 further comprising producing a commanded velocity for the piston; and wherein the equivalent flow coefficient is derived further based on the commanded velocity. 17. The method as recited in claim 12 further comprising producing a commanded velocity for the piston; and wherein the equivalent flow coefficient is derived further based on the commanded velocity. 18. The method as recited in claim 12 wherein controlling operation of the circuit branch comprises: calculating a pressure setpoint based on the equivalent flow coefficient; and controlling the pressure in at least one of the supply line and the return line in response to the pressure setpoint. 19. The method as recited in claim 12 further comprising: calculating a pressure setpoint for the supply line based on the equivalent flow coefficient; and controlling the pressure in the supply line in response to the pressure setpoint. 20. The method as recited in claim 19 wherein the hydraulic system includes other circuit branches; and further comprises for each of the other circuit branches calculating a pressure setpoint for the supply line; and selecting the pressure setpoint having the greatest value for use in controlling the pr