Patent ID: 9574572
Date: 2017-02-21
CPC Classifications: F04D,Y02B

Claim:
1. A control method for a compressor, comprising: providing variable aerodynamic sizing of fluid flow through the compressor at a plurality of operating points of the compressor, for an operating point of the plurality of operating points, determining a head of the compressor based on a process input at the operating point, for the operating point of the plurality of operating points, determining a pressure number as a function of aerodynamic flow sizing at the operating point, and determining, by a control device of the compressor, an operating speed setpoint of the compressor based on the determined head and pressure number, wherein the compressor comprises a rotating impeller having a tip rotating at a tip speed, wherein the pressure number is a function of the head divided by the square of the tip speed, controlling shaft rotational speed of the compressor using the determined operating speed setpoint, based on a closed loop feedback control mechanism, wherein the process input includes a measured compressor inlet temperature, and wherein the process input includes a compressor discharge pressure, further wherein the head is determined based on a pressure surge margin added to the compressor discharge pressure.