Multi-Stage Generator Power Conversion System
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Solution Overview
Problem
Conventional variable-speed turbine/generator/transformer systems have limited efficiency due to restrictions in power output range, especially at low and high fluid speeds, leading to suboptimal energy capture and inefficient power conversion for multi-stage generators with variable power waveforms.
Innovation Solution
A power conversion system with a bank of converters and a system controller that dynamically selects the appropriate converter branches and configurations to match the power output of a multi-stage generator, ensuring efficient energy transfer across a wide range of fluid speeds and power levels, including the use of parser and hybrid conversion topologies to optimize energy capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional single-stage generator is used, then the system is simple in structure, but the energy capture is limited to a fraction of the total capturable energy due to restricted power output range
Solution Approach 1:
The generator is divided into multiple stages, each capable of operating independently or in combination. This segmentation allows the system to capture energy across a wider range of fluid speeds by selecting appropriate stages, thereby resolving the contradiction between improved energy capture and structural complexity.
Solution Approach 2:
The system dynamically selects and combines different generator stages based on real-time fluid speed conditions. This dynamic configuration enables optimal energy capture across varying operating conditions while managing structural complexity through intelligent control.
2Productivity
If a multi-stage generator is used to extend the power output range, then the energy capture is improved, but the electrical power waveform becomes variable and incompatible with standard electrical loads
Solution Approach 1:
A power conversion system acts as an intermediary between the multi-stage generator and the electrical load. This converter standardizes the variable power waveforms from different generator stages into a consistent output format compatible with standard electrical loads, thereby resolving the adaptability issue while preserving the energy capture benefits.
3Adaptability or versatility
If a single power converter is used, then the device complexity is low, but the converter cannot accommodate the widely varying voltage waveforms and power range from a multi-stage generator
Solution Approach 1:
The power conversion system is segmented into multiple converter units, each designed to handle specific voltage and power ranges from different generator stages. This modular approach allows the system to accommodate widely varying power conditions while managing complexity through standardized modular components.
Solution Approach 2:
The power conversion system is designed with multi-functional capability to handle various voltage waveforms and power ranges from different generator stages. This universal design allows a single system architecture to serve multiple functions across different operating conditions, resolving the contradiction between adaptability and complexity.
4Loss of energy
If the generator power rating is limited to optimize efficiency over a restricted range, then the efficiency is improved, but less power is coupled into the turbine at extreme fluid speeds
Solution Approach 1:
The system dynamically configures generator stages and power converters based on real-time fluid speed conditions. At moderate fluid speeds, the system operates in high-efficiency mode with optimized stage combinations. At extreme fluid speeds, the system transitions to power-coupling mode, activating additional stages to maximize power extraction, thereby resolving the contradiction between efficiency and power coupling.
Solution Approach 2:
The system changes operational parameters including active generator stages, converter configuration, and power rating based on fluid speed conditions. This parameter adaptation allows the system to maintain high efficiency at moderate speeds while maximizing power coupling at extreme speeds, resolving the efficiency-power coupling trade-off.
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
The solution enables higher energy capture and efficient power conversion over a wider range of fluid speeds, maximizing energy delivery to the electrical load with minimal losses, and achieving near-maximum power transfer while maintaining system reliability and efficiency.
Implementation Method 1
A multi-stage generator is an electromagnetic machine operating as an electrical generator that takes mechanical energy from a prime mover and generates electrical energy
Data Source
AI summary
An electric power generation system is provided, including a generator having a plurality of stages engaged by a prime mover; and a plurality of branches for connecting the stages to an electrical load, each of the branches having a switch for connecting or disconnecting the branch to the stages. Power from a prime mover, such as a turbine, is sent by a controller to one or more of the branches as appropriate to handle the power level generated.