公开(公告)号：EP3314743A1

公开(公告)日：2018-05-02

申请号：EP16733372.3

申请日：2016-06-21

Applicant: ABB Schweiz AG

Inventor： CORTINOVIS, Andrea ,  MERCANGOEZ, Mehmet ,  PIEDER, Joerg ,  VAN DE MOORTEL, Sture ,  BESSELMANN, Thomas

IPC: H02P27/06 ,  F04D27/00 ,  H02H7/08

Abstract: A method of controlling a compressor system (10) comprises a gas compressor (32) and an electrical variable-speed drive (30) supplied by an electrical grid (36) and driving the gas compressor (32). A method of controlling the compressor system (10) comprises: detecting a voltage dip (12) in a grid voltage (V) supplied to the electrical drive (30) by comparing the grid voltage (V) with a voltage dip threshold; in the case, a voltage dip (12) is detected: assuming a future development (72) of the grid voltage (V); predicting a future development (84) of at least one process quantity (q) based on at least one process parameter (86) measured in the compressor system (10) and the assumption of the future development (72) of the grid voltage (V); providing the predicted future development (84) of the least one process quantity (q) to a protection system (88). The assumed future development (72) of the grid voltage (V) is based on a predefined depth and a predefined length of an average voltage dip, the predefined depth and the predefined length of the average voltage dip are determined online from a set of historical voltage dip cases, and the assumed future development (72) of the grid voltage (V) is based on an assumption of a persistence of the actual measured voltage.