Method of controlling compressor system for preventing surge occurrence and compressor system using the same

A method of controlling a compressor, the method comprising:

• measuring, by a variable measuring sensor arranged at a side of the compressor, variables for generating a performance curve of the compressor;
• calculating, by a controller implemented by at least one processor, changing rates of the variables;
• comparing, by the controller, the calculated changing rates with preset changing rate variations;
• determining, by the controller, a surge control line different from a preset surge control line for the compressor according to the calculated changing rates in response to the calculated changing rates being out of ranges of the preset changing rate variations;
• controlling, by the controller, an amount of opening of a blow-off valve based on the determined surge control line;
• and
• calculating, by the controller, a first parameter and a second parameter by non-dimensionalizing the changing rate of a first variable and the changing rate of a second variable,
• wherein the variables comprise the first variable and the second variable different from the first variable,
• wherein the first parameter and the second parameter are calculated according to equations
• P
• ⁢
• ⁢
• 1
• =
• X
• .
• X
• ⁢
• ⁢
• and
• ⁢
• ⁢
• P
• ⁢
• ⁢
• 2
• =
• Y
• .
• Y
• ,
• and
• wherein the P1 and P2 denote the first parameter and the second parameter, X denotes the first variable of the compressor, {dot over (X)} denotes a changing rate of the first variable, Y denotes the second variable of the compressor, and {dot over (Y)} denotes the changing rate of the second variable.