Performance evaluation of a transformerless multiphase electric submersible pump system

• Published in: Journal of engineering (Stevenage, England) England), 2014-08, Vol.2014 (8), p.407-414
• Main Authors: Hakeem, Ahmed A, Elserougi, Ahmed Abbas, Abdel-Khalik, Ayman Samy, Ahmed, Shehab, Massoud, Ahmed Mohamed
• Format: Article
• Language: English
• Subjects: asynchronous machines; boost-inverter; filter networks; filter-less operation; five-phase modular winding induction machine; invertors; low-voltage variable-frequency drive; machine windings; overvoltage; overvoltage problems; pumps; sinusoidal output voltage; step-up transformer; transformerless multiphase electric submersible pump system; travelling wave phenomenon; variable speed drives; voltage boosting capability
• ISSN: 2051-3305; 2051-3305
• DOI: 10.1049/joe.2014.0148

Using of low-voltage variable-frequency drive followed by a step-up transformer is the most preferable way to feed an electrical submersible pump motor. The existence of long feeder between the motor and drive systems usually causes over-voltage problems because of the travelling wave phenomenon, which makes the employment of filter networks on the motor or inverter terminals mandatory. The so-called boost-inverter inherently can solve this problem with filter-less operation as it offers a direct sinusoidal output voltage. As boost inverters have voltage boosting capability, it can provide a transformer-less operation as well. This study investigates the performance of a five-phase modular winding induction machine fed from a boost-inverter through a long feeder. A simulation study using a 1000 Hp system and experimental investigation on a 1 Hp prototype machine are used to support the presented approach.