Split Bus Fuel Cell System for Auxiliary Power Delivery
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Solution Overview
Problem
Existing power systems require multiple stages of power conversion, increasing complexity and reducing efficiency when combining alternative power sources like fuel cells and DC sources to power auxiliary devices such as pumps and blowers, which are typically 3-phase AC motors.
Innovation Solution
A split bus configuration that combines direct currents from multiple fuel cell segments and alternative DC sources to minimize power stages, using a split bus with positive, negative, and neutral buses to provide a combined direct current to an inverter, generating alternating current for loads with reduced conversion stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple stages of power conversion are used to combine alternative power sources and power auxiliary devices, then the system can provide power to both main and auxiliary loads, but the complexity and cost of the system increases
Solution Approach 1:
The system is divided into two separate power delivery paths: a first power delivery path for auxiliary devices and a second power delivery path for main loads. This segmentation allows each path to be optimized independently, reducing the complexity of power conversion stages for auxiliary devices while maintaining versatility for both auxiliary and main power delivery.
Solution Approach 2:
A DC bus serves as an intermediary component that receives DC power from alternative power sources and distributes it to both the first power delivery path (for auxiliary devices) and the second power delivery path (for main loads). This intermediary DC bus eliminates the need for multiple power conversion stages, reducing system complexity while maintaining adaptability.
2Ease of operation
If multiple stages of power conversion are used to convert DC to AC and control motor speed, then auxiliary devices can be powered and speed control can be achieved, but the efficiency of the system decreases
Solution Approach 1:
The invention extracts the power conversion stages from the auxiliary device power path by providing DC power directly from the DC bus to auxiliary devices that operate on DC. This eliminates unnecessary AC conversion and re-conversion to DC, reducing energy losses while still enabling auxiliary device operation.
Solution Approach 2:
Instead of converting DC to AC and then back to DC for auxiliary devices (the conventional approach), the system inverts the approach by delivering DC directly from the DC bus to auxiliary devices. This inversion eliminates redundant power conversion stages and improves overall system efficiency.
3Adaptability or versatility
If AC synchronization is required when combining alternative power sources, then multiple power sources can be integrated, but the complexity of the system increases
Solution Approach 1:
The system changes the electrical parameter from AC to DC by using a DC bus as the common power distribution medium. Since DC power sources do not require synchronization like AC sources do, this parameter change eliminates synchronization complexity while maintaining the ability to integrate multiple alternative power sources.
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 reduces the number of power conversion stages, enhancing efficiency, minimizing complexity and cost, while allowing for efficient integration of multiple power sources and direct current integration without the need for AC synchronization.
Implementation Method 1
receiving a first direct current at a positive bus of a split bus, where the first direct current originates from a first fuel cell segment
Data Source
AI summary
A method of providing electrical power using a split bus configuration includes receiving a first direct current at a positive bus of a split bus, where the first direct current originates from a first fuel cell segment. A second direct current is received at a negative bus of the split bus, where the second direct current originates from a second fuel cell segment. A third direct current is also received at the split bus such that a combined direct current is formed including the first direct current, the second direct current, and the third direct current. The third direct current originates from an alternative direct current (DC) source. The combined direct current is provided to an inverter such that an alternating current is generated for a load.