Power Converter Cable Length Control
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Solution Overview
Problem
In deep and highly deviated wellbores, electrical motors experience diminished performance due to the length of cables required for power delivery, leading to unreliable and inefficient operation, especially when peak power demands exceed the capacity of traditional motor control systems and battery-powered systems.
Innovation Solution
Implementing a power converter system that measures power consumption and adjusts operating parameters of electrical loads to match the maximum power available at the end of the cable or from a battery, using a processor to calculate and maintain optimal power transfer by adjusting voltage and current to prevent power limitations, thereby ensuring efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional motor control based on maintaining velocity or torque is used, then motor operation is simplified, but motor performance is severely diminished due to cable length
Solution Approach 1:
The system continuously measures the actual power delivered to the motor through the cable and uses this feedback to dynamically adjust operating parameters. The power converter monitors power consumption and compares it against the maximum available power, then adjusts voltage and current accordingly to maintain optimal motor performance without exceeding cable capacity.
Solution Approach 2:
The control system transitions from static velocity or torque maintenance to dynamic power-based control. Operating parameters are continuously adjusted based on real-time power measurements and changing load conditions, allowing the motor to operate at peak efficiency while adapting to varying demands during wellbore operations.
2Duration of action of moving object
If peak power demands are exceeded in battery-powered systems, then operational autonomy is reduced, but immediate power availability is compromised
Solution Approach 1:
The system pre-determines the maximum power available from the battery before operations begin and establishes power delivery limits in advance. By calculating and setting these boundaries beforehand, the system prevents power demands from exceeding battery capacity, thereby maximizing operational autonomy while ensuring adequate power is always available for required operations.
Data Source
AI summary
This disclosure is drawn to methods, systems, devices and/or apparatus related to power control in applications over long cables. Specifically, the disclosed methods, systems, devices and/or apparatus relate to power control that considers the maximum power available at the end of a long cable (or from a battery) to a load over a broad range of load conditions. Some example systems may include a power supply located at the Earth's surface and a power converter coupled to the power supply via a cable having a first end coupled to the power supply and a second end coupled to the power converter. Some example power converters may be configured to measure the power being consumed by the electrical load in the well, and adjust operating parameter(s) of the electrical load based, at least in part, on the maximum power available at the second end of the cable.