Regulation methods of turbine compressors
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Control methods include speed control, throttle control, and bypass control. I would like to ask what is the difference between throttle control and speed control here?
Throttling is controlled using a valve, usually at the inlet, resulting in efficiency losses. Speed regulation is efficient, but the cost is higher than that of throttling.
The rotation speed is usually controlled via frequency conversion, which requires a frequency conversion cabinet and a control cabinet; this generally costs more than valves or guide vanes. Outlet throttling is the cheapest option, but it is not recommended as it is unsafe and may cause surging. Inlet throttling is also relatively easy to implement, but the diameter of the inlet is generally larger, so it is more expensive than outlet throttling. Apart from the efficiency loss, its advantage is relative safety; when the inlet size is reduced, the new performance curve shifts toward the lower left, meaning that the range of adjustment is wider than that for the outlet, which makes it less likely to induce surge.