DC Bus Power Feeding with Battery Converter Feedback Control
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Solution Overview
Problem
The existing power feeding systems with renewable energy sources, such as photovoltaic power generation devices, suffer from reduced conversion efficiency due to the interposition of multiple DC/DC converters between the renewable energy generation device and the storage battery, leading to inefficiencies in power supply and generation control.
Innovation Solution
A power feeding system with a DC bus connected directly to the renewable energy power generation device and a bidirectional converter between the storage battery and the DC bus, allowing for optimized bus voltage adjustments based on power differences, thereby improving conversion efficiency and power generation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the renewable energy power generation device is connected to the DC bus via a DC/DC converter, then the power conversion is controlled, but the conversion efficiency decreases due to multiple converters
Solution Approach 1:
The patent extracts and removes the unnecessary DC/DC converter from the connection path between the renewable energy power generation device and the DC bus. By directly connecting the renewable energy device to the DC bus, the system eliminates redundant conversion stages while maintaining power control through the power management device that adjusts bus voltage based on power balance calculations.
2Productivity
If the bus voltage is changed to control power generation, then the power generation control is achieved, but the system stability may be affected
Solution Approach 1:
The patent implements a feedback control mechanism where the power management device continuously monitors the power balance (difference between supply power from renewable energy and load power) and adjusts the bus voltage accordingly. This closed-loop control ensures that power generation is optimized while maintaining system stability through real-time adjustments based on actual operating conditions.
Solution Approach 2:
The system dynamically adjusts the bus voltage based on real-time power balance conditions rather than maintaining a fixed voltage. The power management device modifies operating parameters adaptively to optimize power generation while ensuring system stability, allowing the system to respond flexibly to changing load conditions and renewable energy availability.
Data Source
AI summary
A power feeding system includes a direct current (DC) bus for supplying DC power, a renewable energy power generation device connected to the DC bus, a first converter connected to the DC bus and converting a bus voltage supplied to the DC bus into a load voltage supplied to a load device, a storage battery, a second converter provided between the storage battery and the DC bus and capable of bidirectionally converting the bus voltage and a battery voltage of the storage battery, and a power management device controlling the second converter to charge and discharge the storage battery. The power management device controls the second converter to change the bus voltage based on difference power obtained by subtracting load power supplied to the load device from supply power supplied to the DC bus, the supply power including generated power generated by the renewable energy power generation device.