Tadayoshi Saito

Analysis of control characteristics using fuel cell plant simulator

To estimate the operational characteristics of duel cell power plants, the authors developed a dynamic simulator and analyzed the operating characteristics. In the simulations, attention is given to the pressure difference between the cathode and anode of the fuel cell and the system base pressure. The former is important for safe operation of the fuel cell and the latter is important for safe operation of the reformer. For load following and shut-down modes of the 1 MW plant studied, calculation results were compared with actual test results and agree fairly well. >

A3.2 : Digital Governor Using Microcomputers for Modern Steam Turbines

Abstract A new digital governor using microcomputers fulfilling the requirements for operation of steam turbines in modern thermal power stations has been developed. The dynamic characteristics of steam turbines are analyzed, and the results are taken into consideration for planning a control system. Particularly nonlinear characteristics of turbines during start-up are clarified and compensated by control algorithms. The features of the new governor are as follows: (1) Wide Coverage of control functions for steam turbine operation. (2) Coexistence of flexibility and standardization of control functions. (3) High reliability based on a redundant system. The governor is tested at a thermal power plant, and its functions and performances are confirmed to be satisfactory