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AssigneeWestinghouse Electric Corp.
InventorsRobert A. Yannone, John F. Reuther
Estimating the term…
An optimized high load blocking limit is independently computer calculated for each gas turbine-generator unit as a dynamic function of combustor shell pressure and exhaust temperature every second. A low load blocking limit can be calculated as a function of the high blocking limit. The high and low dynamic limits then define a band of megawatts instantaneously available to the system. At the dispatch computer, load-frequency control is executed and the calculated load demands are dispatched to the various gas turbine-generator units which respond without exceeding the respective high and low load blocking limits. A turbine control unit load reference is modified by the dispatched load change and each unit load control operates its turbine fuel control valves to satisfy the load demand.
A load-frequency control system for a power system having steam and gas turbine-generator units, said control system comprising a plurality of gas turbine-generator units, means for controlling the load level of each of said gas turbine-generator units to satisfy a load reference applied thereto, means for generating the load references for the respective units to provide for a substantially constant system alternating frequency of predetermined value substantially without exceeding a high blocking limit for each of said units, means for generating a representation of turbine exhaust temperature and combustor shell pressure for each unit, and means for dynamically generating the high blocking limit for each of said units as a function of the turbine exhaust temperature and the combustor shell pressure.
Dependencies are inferred from the claim text.