Operation of subsea electrical submersible pumps supplied over extended length cable systems

The special circumstances are considercd of an induction motor driven submersible punip supplied from a variable frequency converter which is remote from the pump location, necessitating subsea cables which may be considerably longer than in normal practice. The principal objective of the series of practical tests is to investigate the pcrroniiance of such systems to evaluate a complete electromechanical system model for use in the prediction of the current and torque requirements of the drive, and to assess the effect of converter switching patterns on the voltage profile of the transmission section. Results of coinputer studies are presented which are validated by comparison with measurements taken on an ESP system during precommissioning tests. The factors affecting the inservice operational characteristics of the drive are discussed and recommendations made.