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The characteristics of steam turbine high pressure cylinder intake valve directly affect the performance of AGC and primary frequency modulation, In DEH system, the nonlinear characteristics of the high valve flow need to be corrected to ensure a smooth and linear relationship between the integrated valve level instruction and the steam flow of the turbine. When the nonlinear correction of the high valve flow is not correct, there may be nonlinear intervals such as “dead zone”, “jump”, and “inflection point” between the valve comprehensive opening instruction and the steam turbine flow, The valve integrated opening command mutates the gain of steam turbine flow, causing the valve to be insensitive or oscillating when the valve is in a certain opening range under the coordinated control system of the furnace and machine.

Test of flow characteristics and parameter optimization of steam turbine DEH