Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 1998.07b
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- Pages.728-730
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- 1998
Control Valve Positioner and Its effect on a Gas Turbine MW Control
공정제어루프 최종 조작부의 동작특성에 관한 연구
- Kim, Jong-An (KEPCO, KEPRI) ;
- Shin, Yoon-Oh (KEPCO, KEPRI)
- Published : 1998.07.20
Abstract
The control valve positioner is a high gain plain proportional controller which measures the valve stem position and compares it to its setpoint which is the primary controller output. The positioner in effect is the cascade slave of the primary controller. In order for a cascade slave to be effecttive, it must be fast enough compared to the speed of its set point change. This paper describes the positioner transfer function and its effect on the entire control loop characteristic based on the simulation results. The result showed that the control valve and positioner determined the gain and phase angle in the high frequency range, while the primary controller and process determined those of the low frequency range. We can also anticipate the combined characteristics in the whole frequency range when each element's frequency response is known.
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