Control system for controlling a dynamic compressor

Details Control system for controlling a dynamic compressor Control system for controlling a dynamic compressor

1975-03-31

1976-09-07

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

'reset' systems

415 11, 415171, 290 52, G05B 102

Patent

active

039796558

ABSTRACT:
A control system is disclosed for a cascade control of a dynamic compressor having a variable speed of rotation to maintain a constant pressure to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the flow rate of a compressor, the pressure in the delivery or in suction; the output signal of each outer loop being the input signal for the inner loop and each of the loops containing a compensating element to reduce the effects of large time constants of all inner loops.
An automatic control system based on using the above method, distinguished by its great transient and steady state precision in maintaining a main controlled parameter, and by the high reliability of protection of the compressor from surge and from a dangerous increase of the speed of rotation.

REFERENCES:
patent: 2751187 (1956-06-01), Deriaz
patent: 3773429 (1973-11-01), Hayward

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