Dual Generator Single DC Bus Electric Drive Propulsion
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Solution Overview
Problem
Existing electric drive systems for heavy machinery often rely on single generators, which can lead to inefficiencies and reduced reliability, as they require larger generators and lack redundancy in case of power source failure.
Innovation Solution
A dual generator system where two generators, each connected to a prime mover, supply power to a single DC bus through rectifiers, with an inverter/controller managing the power distribution to motors, ensuring balanced operation and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single generator is used to supply power to multiple motors, then the system structure is simpler, but the generator size increases and reliability decreases
Solution Approach 1:
The power generation system is segmented into multiple independent generators (first generator and second generator), each connected to separate rectifiers and power buses. This segmentation allows the system to maintain functionality even if one generator fails, thereby improving reliability while keeping individual generator sizes manageable.
Solution Approach 2:
Multiple power buses (first power bus and second power bus) are merged into a single common power bus that supplies both motors. This merging allows the system to achieve reliability through multiple generators while maintaining structural simplicity through a unified power distribution point.
2Device complexity
If a single generator provides twice the power, then the system is simpler, but maintenance costs increase and redundancy is lost
Solution Approach 1:
The power generation capacity is segmented across two smaller generators instead of one large generator. This segmentation reduces maintenance costs as smaller generators are less expensive to maintain and replace, while also providing redundancy if one generator fails.
Solution Approach 2:
The system changes the parameter of generator capacity distribution from concentrated (one large generator) to distributed (two smaller generators). This parameter change maintains total power output while reducing individual generator size, thereby lowering maintenance costs and improving ease of manufacture.
3Reliability
If multiple generators supply power to separate power buses, then reliability improves, but system complexity increases
Solution Approach 1:
The first power bus and second power bus are merged into a single common power bus that receives power from both generators. This merging reduces the number of separate power distribution systems while maintaining the reliability benefits of having multiple generators, as the common bus can draw power from either generator independently.
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 configuration allows for more efficient power utilization, reduced maintenance costs, and improved reliability by enabling smaller generators and supporting partial failure modes, enhancing the overall performance and efficiency of electric drive systems in heavy machinery.
Implementation Method 1
a first rectifier coupled to the first generator and having a first direct current (DC) output, and a second rectifier coupled to the second generator and having a second DC output
Data Source
AI summary
A machine is described that includes an electric drive for propelling the machine along a ground surface. The machine includes an electric power supply system configured to deliver operating electrical power to the electric drive. The electric power system includes a first generator and a second generator. The electric power system also includes a first rectifier coupled to the first generator and having a first direct current (DC) output and a second rectifier coupled to the second generator and having a second DC output. Both the first DC output and the second DC output are coupled to the single DC bus, thereby providing an arrangement for the first rectifier and the second rectifier to simultaneously provide power to the single DC bus. The electrical power system also includes a first inverter/controller coupled to the single DC bus and configured to provide a controlled alternating current to a first motor.