Distributed Storage DC/DC Converter with Common Bus Power Droop
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Solution Overview
Problem
Existing dual power systems, particularly in solar tracking systems, face inefficiencies and delays in switching between solar power and battery power due to complex correlations between multi-input port inverters and battery chargers, limiting their ability to respond quickly to changing energy demands in micro-grid applications.
Innovation Solution
A single input port inverter system with a common bus and bi-directional DC/DC converters that use a power droop method to maintain constant power output, allowing for ramping up or down of output power without active control, and a controller that monitors load demand and battery health to manage battery banks effectively, ensuring maximum power point tracking and efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-input port inverter is used to manage solar array and battery charging/discharging separately, then power management capability is improved, but system complexity and communication delay increase
Solution Approach 1:
The system separates the inverter function from the battery management function. The single-input port inverter handles AC power conversion while bi-directional DC/DC converters handle battery charging and discharging independently on the DC side, eliminating the need for complex multi-port inverter coordination
Solution Approach 2:
A common DC bus is introduced as an intermediary between the solar array and the battery system. This common bus allows independent connection of solar panels and battery banks to the inverter through separate DC/DC converters, simplifying the overall system architecture while maintaining flexible power management
2Power
If a multi-input port inverter is used to meet large power requests, then power output capability is improved, but response speed and communication efficiency decrease
Solution Approach 1:
The power management function is segmented into independent DC/DC converters that operate autonomously on the DC side. Each converter responds independently to power demands without requiring communication coordination, achieving fast response speeds while maintaining high power output capability through parallel operation
Solution Approach 2:
The bi-directional DC/DC converters are designed to autonomously manage battery charging and discharging based on DC bus voltage conditions without requiring active control signals or communication protocols. The converters self-regulate power flow based on predefined control logic, eliminating communication delays
3Measurement precision
If active control of DC/DC converters is used to manage power output, then power regulation precision is improved, but system complexity and response time increase
Solution Approach 1:
The DC/DC converters operate with autonomous self-service control based on DC bus voltage levels. When voltage exceeds a threshold, converters automatically reduce power output; when voltage is below threshold, they increase power output. This passive voltage-based control achieves precise power regulation without complex active control algorithms or communication overhead
Data Source
AI summary
A multi-power distributed storage system including a first power source; a second power source electrically connected to a common bus with the first power source; a single input port inverter electrically connected to the common bus. The system including a controller configured to communicate with at least the second power source, and the single input port inverter. The second power source including a plurality of battery banks and a plurality of bi-directional DC/DC converters configured to charge and discharge the plurality of battery banks and provide DC to the single input port inverter.