Variable Frequency Marine Power Distribution
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Solution Overview
Problem
Conventional power distribution systems operate at fixed frequencies, leading to inefficiencies in fuel consumption and emissions, as they cannot adjust prime mover speeds to match varying load demands, resulting in suboptimal operational efficiency and increased pollutant production.
Innovation Solution
A power distribution system that allows prime movers to run at variable speeds in response to load demands, using a power management controller to adjust system frequency and optimize speed settings for minimized fuel consumption and emissions, enabling efficient load sharing and generator management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed-frequency operation is used to maintain stable power distribution, then system stability is improved, but fuel consumption and emissions increase due to inability to adapt to varying load demands
Solution Approach 1:
The patent implements variable speed operation for prime movers, allowing the system to dynamically adjust rotational speeds based on load demands. The power management controller continuously monitors load conditions and adjusts prime mover speeds accordingly, enabling the system to maintain stability through controlled variability rather than fixed operation, thus reducing fuel consumption while preserving system reliability
Solution Approach 2:
The system changes the operational parameters of prime movers by allowing frequency and speed to vary within defined ranges. The power management controller adjusts speed references and operational parameters in real-time based on load conditions, transforming the rigid fixed-frequency operation into a flexible parameter-adaptive system that optimizes fuel efficiency while maintaining power distribution stability
2Use of energy by moving object
If prime mover speeds are varied to match load demands and reduce fuel consumption, then energy efficiency is improved, but system frequency stability deteriorates
Solution Approach 1:
The power management controller implements continuous feedback monitoring of load conditions, prime mover speeds, and system frequency. Based on this feedback, the controller dynamically adjusts speed references to maintain frequency stability within acceptable ranges while optimizing energy efficiency. The feedback mechanism ensures that frequency deviations are corrected in real-time, reconciling the conflict between variable speed operation and frequency stability
Solution Approach 2:
The power management controller acts as an intermediary between load demands and prime mover operation. It processes load information, determines optimal speed settings, and coordinates adjustments across multiple prime movers to maintain overall system frequency stability. This intermediary function allows individual prime movers to operate at efficient variable speeds while the controller ensures collective frequency stability
3Use of energy by moving object
If variable speed operation is implemented to optimize fuel consumption, then fuel efficiency is improved, but device complexity increases due to advanced control requirements
Solution Approach 1:
The power management controller is designed as a multi-functional device that performs load monitoring, speed reference generation, frequency stabilization, and coordination of multiple prime movers. By consolidating these functions into a single universal controller, the system achieves variable speed operation and fuel optimization without proportionally increasing overall control system complexity
Solution Approach 2:
The patent merges the frequency control function with the speed control function in a unified power management controller. Rather than having separate control systems for frequency stabilization and speed optimization, these functions are combined into one integrated controller that simultaneously manages both objectives, reducing the total complexity compared to having multiple independent control systems
Data Source
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AI summary
The present invention provides a power distribution system that does not rely on a fixed frequency and which therefore allows prime movers (D1...D4) to run at different speeds in response to load demand, typically so that fuel consumption and/or harmful exhaust emissions is/are minimised. A marine power distribution and propulsion system (100) can include an ac busbar (2) adapted to carry a variable-frequency ac distribution voltage. A plurality of ac generators (G1...G4) are connected to the busbar (2), each having an associated prime mover (D1...D4) such as a diesel engine, turbine etc. A power management controller (66) is adapted to vary the rotational speed of the prime movers (D1...D4) with reference to the electrical load on the ac busbar (2) such that the generators (G1...G4) provide a variable frequency output during normal operation of the power distribution system (100). Such operation is to be contrasted with conventional distribution systems which have a fixed frequency.