Generator Droop Frequency for Motor Load Balancing
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Solution Overview
Problem
Existing systems with dual motors for mechanical loads face challenges in balancing torque distribution between primary and backup motors, especially when one motor is already at steady-state temperature and the other is at a lower temperature, leading to potential overloading due to temperature differentials.
Innovation Solution
A system of alternating current (AC) power generators is configured to adjust frequency based on load feedback, using a droop curve mechanism where the output frequency of generators is reduced as the load increases, allowing for load balancing between two AC motors by creating separate power sources and adjusting the frequency of each motor pair to share mechanical loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two motors share a mechanical load with one primary and one backup motor, then the system provides redundancy and extra torque capability, but the load distribution between motors becomes unbalanced leading to potential overloading
Solution Approach 1:
The system uses motor load feedback to continuously monitor the actual load distribution between the two motors. This feedback signal is fed to the control system which adjusts the generator frequencies dynamically to maintain balanced load sharing, resolving the load balancing problem while preserving system redundancy
Solution Approach 2:
The invention changes the operating parameters (frequency) of the generators based on motor load conditions. By adjusting the frequency of each generator independently according to its motor's load feedback, the system achieves dynamic load balancing between the primary and backup motors
2Ease of operation
If generators operate without frequency adjustment, then the system is simple to operate, but load balancing between motors cannot be achieved
Solution Approach 1:
The system implements self-service through automatic feedback control where each generator automatically adjusts its own frequency based on load feedback from its motor. This eliminates the need for complex manual coordination while achieving reliable load balancing, making the system both simple to operate and effective
3Ease of operation
If variable speed drives are used to balance motor loads, then precise load control is achieved, but system cost increases
Solution Approach 1:
The invention replaces the mechanical/electrical variable speed drive system with a control strategy that adjusts generator frequencies. This substitution achieves the same load balancing function using the existing generator control mechanisms, thereby reducing system cost and complexity while maintaining precise load control capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures balanced mechanical load sharing between AC motors, reducing the risk of overloading and maintaining efficient operation without the need for variable speed drives, thereby providing a cost-effective solution for load balancing in systems like those used on fishing vessels.
Implementation Method 1
the generators are configured to operate on a droop curve wherein the output frequency of the generators is reduced as the load on the motor increases
Data Source
AI summary
A system for variable speed drives using generators adjusting the motor frequency having a plurality of main generators 1, 2, 3 and 4 as the means of adjusting a plurality of AC motors frequency, a processor is provided that opens a main bus tie breaker in a power system to create two separate power systems, power source A and power source B, wherein power source a is powered by a generator 1 and a generator 2. and power source b is powered by a generator 3 and a generator 4, wherein the generators 1-4 are configured to operate on a droop curve wherein the output frequency of the generator is slightly reduced as the load increases.