Abstract
Majority Variable Speed Drives (VSD) currently deployed in various fields are designed specifically for running induction motors. Yet, with the growing application of permanent magnet motors, there arises a demand for VSDs built on a distinct operational framework. However, replacing existing drives with ones compatible with permanent magnet motors poses significant economic and logistical challenges. This paper explains the methodology involved in on-site retrofitting VSDs to turn them compatible with permanent magnet motors.
VSD retrofitting stategy is based on three major principles: leveraging existing drive capabilities for technical advantage, cost efficiency, and streamlining logistics and footprint.
On the technical front, upgrading conventional drives deployes integrating PMM-compatible components, faster IGBTs, modern HMI controllers, and output Sine Wave Filters. This unified approach enables on-site modification of VSDs regardless of brand, whether in onshore or offshore environments. Prior to implementation, a thorough prejob inspection customizes the procedure to suit each drive's unique dimensions, shape, and condition.
Economically, a lean approach maximizes original components and preserves OEM-specified technical features, ensuring optimal cost-effectiveness.
The primary result of VSD modification is achieving of compatibility with Permanent Magnet Motors while minimizing intervention and cost, keeping technical parameters either unchanged or improved. Post-upgrade, VSD becomes capable of operating at frequencies up to 300 Hz enabling application of ultra high-speed ESP for increased production. The incorporation of a modern HMI controller, featuring a user-friendly color display, extends standard protections and mitigates a risk to human error. Retaining the VSD's original rectifier ensures THD level stipulated by the VSD OEM. The addition of the system with a Sine Wave Filter further enhances power quality and contributes to the extended operational life of ESP.
The technical enhancements achieved through modification are balanced with the project's cost and resource allocations, thereby minimizing materials and streamlining operational processes.
From a logistical perspective, the elimination of heavy machinery dependencies, such as trucks, forklifts, cranes, and barge-cranes, results in a notable reduction in both financial expenditures and project timelines.
Consequently, this methodological procedure offers a pragmatic upgrade of field infrastructure with PMM compatible drives in the most eco-friendly way.
The retrofitting of conventional VSD presents a comprehensive transformation opportunity for Artificial Lift systems, yielding numerous financial benefits. A seamless transition from induction motors to PMM streamlines the cost per barrel, while leveraging existing inventory enables the immediate embrace of technical advancements without delay.
