CONTROL METHOD AND DEVICE FOR COMPRESSOR SYSTEM

The present disclosure describes a control method for a compressor system that comprises a compressor connected to a pressure vessel and a frequency converter controlling an electric motor of the compressor. In the method, the present operating state is estimated on the basis of a monitored/estimated electrical quantity of the compressor system. The operating state may represent the pressure in the pressure vessel. The pressure in the pressure vessel causes a counter-torque to the motor. The counter-torque is proportional to the pressure and may be used for estimating the pressure inside the pressure vessel. An estimate of a counter-torque may be calculated on the basis of the monitored electrical quantity or quantities. 本公开内容描述了种用于压缩机系统的控制方法，所述压缩机系统包括与压力容器连接的压缩机和对压缩机的电机进行控制的变频器。在所述方法中，基于压缩机系统的所监测/估计的电气量来估计当前操作状态。操作状态可以表示压力容器中的压力。压力容器中的压力产生电机的反作用扭矩。反作用扭矩与压力成比例并且可以用于估计压力容器内的压力。可以基于所监测的个或更多个电气量来计算对反作用扭矩的估计。本发明还公开了种用于实施所述控制方法的设备。