Variable Speed Drive Energy Savings via Reference Power Estimation
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Solution Overview
Problem
The challenge in accurately determining the reference power value for variable speed drives (VSDs) leads to overestimation of energy savings, as conventional methods rely on nominal motor power, which can vary significantly due to motor and actuator sizing, hindering the effective use of energy-saving monitoring features.
Innovation Solution
A method utilizing cloud technology to remotely collect operational data from VSDs, generate a curve representing speed and power relationships, and determine a reference power value at the nominal speed, enabling accurate estimation of energy savings compared to direct on-line motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nominal motor power is used as the reference power value, then the calculation is simple, but the energy savings estimation is inaccurate due to variations in motor and actuator sizing
Solution Approach 1:
The system collects actual operational data from the motor and VSD, uses this feedback to determine the reference power value at nominal speed, and continuously monitors operational parameters to calculate accurate energy savings. This closed-loop feedback mechanism replaces static nominal power values with dynamically determined reference values based on actual motor performance.
Solution Approach 2:
The system uses the motor's own operational data to determine its reference power value and calculate energy savings, eliminating the need for external manual measurements or manufacturer-provided reference values. The motor essentially measures and evaluates its own performance characteristics.
2Measurement precision
If actual operational data is collected to determine reference power value, then energy savings estimation accuracy is improved, but system complexity increases
Solution Approach 1:
The system leverages the existing multi-functionality of modern VSDs and motors, which already具备 operational data collection, processing, and communication capabilities. By utilizing these existing functions for the additional purpose of determining reference power values and calculating energy savings, the system avoids adding significant complexity while achieving accurate measurements.
Data Source
AI summary
A method including collecting operational data associated with a motor controlled by a variable speed drive, wherein the operational data includes at least speed values and power values of the motor; determining, based on the operational data, a reference power value corresponding to a nominal speed value of the motor; and estimating, based on the reference power value, an amount of energy saved by the variable speed drive compared to direct on line motor control.