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How can I solve hunting problem in turbine main steam control valves?
Csanyal
You can solve hunting, or oscillatory instability, in a closed loop control system by adding feedback damping, in the form of high pass negative feedback of actuator input to sense input. This slows the actuator, and gives the controlled system more time to respond. You can overdo it, however, and make the controlling system sluggish. Its a matter of finding the sweet spot, technically the critical damping point, where you have the best compromise between underdamping and overdamping.
This answer is not specific to turbine main steam control valves. It addresses the more general case of closed loop servo systems. If someone has a more specific answer to the question, please feel free to refine the answer
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What is the effect of steam turbine control valve throttling in turbine efficiency?
In Boiler follow turbine mode , Boiler produces a constant pressure behind throttling valve and throttling valve adjusts necessary pressure and required steam as High Pressure steam for entering the turbine . In Valves Wide Open (VWO) mode the efficiency is maximum and we haven't any loss. (It's nearly 106% Turbine MCR) . In Turbine MCR , we have a little loss and consequently a little bit worse heat rate . In partial load , loss is more and efficiency worse.
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