Regulating operation of compressor - adjusting RPM or setting guide vanes according to desired value delivered by process regulator

摘要

The S-criterion or the output pressure at a value under a determined max. value is regulated by a pump prevention regulator (3) or a blow-off valve. The desired value of the process regulator (4) suitable for altering the compressor r.p.m. or the setting of the guide vanes is multiplied by a factor, and the compressor r.p.m. or the setting of the guide vanes are controlled by the desired value altered in this manner. This factor is determined by a load distribution regulator (5) which keeps constant a value computed from the S-criterion. At least one further compressor is connected to the compressor (1). The desired value of the process regulator for each compressor is multiplied by a factor. The compressor r.p.m. or the setting of the guide vanes is controlled by the signal altered in this way. This factor is computed by a load distribution regulator which keeps a value constant and computed from the S-criteria of the two parallel compressors. ADVANTAGE - Ensures improved compressor regulation, dynamic behaviour to stable operating point. Overall range of compressor has desired stability and regulation is suitable for compressors in series or in parallel.