Multisource Power System Uniform Voltage Distribution
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Solution Overview
Problem
Existing power supply systems with serial in parallel out (SIPO) architectures face challenges in optimizing power flows and maintaining uniform voltage distribution across non-identical series connected power sources, leading to suboptimal power sharing and transfer.
Innovation Solution
The system employs uniform voltage distribution (UVD) control of converter input voltages to prioritize optimum power transfer from series connected power sources over uniform power sharing, using isolated DC-DC converters and a system controller with optocoupler circuits for signal isolation and improved frequency response, along with maximum power tracking and battery protection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If uniform voltage distribution control is applied to series connected power sources, then uniform power sharing among converters is achieved, but optimum power transfer from non-identical power sources is compromised
Solution Approach 1:
The control system dynamically adjusts converter input voltages based on real-time power source characteristics. The system transitions from static uniform voltage distribution to dynamic voltage adjustment, where each converter's input voltage is individually optimized to match the instantaneous output characteristics of its associated power source, thereby achieving both uniform voltage distribution and optimum power transfer
Solution Approach 2:
The system changes the operating parameters (input voltages) of the converters to optimize power transfer. By continuously adjusting the input voltage parameters of each converter based on feedback from power source output characteristics, the system adapts to non-identical power sources while maintaining uniform voltage distribution across the series connection
2Productivity
If power flow optimization is prioritized for non-identical power sources, then power transfer efficiency improves, but uniform voltage distribution among series connected converters deteriorates
Solution Approach 1:
Each converter is controlled independently with its own input voltage adjustment, allowing local optimization. The system applies different voltage control strategies to different converters based on their specific power source characteristics, enabling each converter to operate at optimal efficiency while collectively maintaining uniform voltage distribution across the series connection
3Stability of the object's composition
If identical DC input currents are drawn from common power source, then uniform power sharing is achieved, but adaptability to non-identical power sources is reduced
Solution Approach 1:
The control system is designed to universally accommodate different types of power sources (photovoltaic panels, batteries, fuel cells) with varying characteristics. By implementing adaptive voltage control that can handle both identical and non-identical power sources, the system achieves multi-functionality and broad adaptability while maintaining stable operation and uniform voltage distribution
Data Source
AI summary
A multisource power system utilizing output isolated DC-DC converters in a serial input, parallel output arrangement provides uniform input voltage distribution and selective maximum power tracking wherein embodiments include maximum power tracking (“MPT”) with a single MPT controller, a battery dominated output voltage bus, and a regulated output voltage bus.