DC Power Feed Control for Solar-Battery Backup During Outages
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Solution Overview
Problem
The existing power feeding device is unable to efficiently utilize solar battery power during a commercial AC power failure when the solar battery's power generation is lower than the load power due to weak solar light, resulting in low use efficiency of the solar battery.
Innovation Solution
A power feeding device with a first power converter that maximizes solar battery output in normal conditions and controls it to output less power than the load during AC power failures, and a second power converter that manages power storage device voltage, ensuring efficient use of solar battery power by supplementing with stored power when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solar battery outputs maximum power in normal conditions, then the power generation efficiency is improved, but during power failure the load cannot be fully supplied when solar power is insufficient
Solution Approach 1:
The patent implements dynamic control of the solar battery output based on system state. During normal operation, the solar battery operates at maximum power point. During power failure, the controller dynamically adjusts the solar battery output to a first power level and coordinates with the power storage device to maintain load supply, thereby resolving the contradiction between maximum power generation and reliable load supply under varying conditions.
Solution Approach 2:
The controller changes the operating parameters of the solar battery based on system conditions. In normal state, the solar battery operates at maximum power; during power failure, the controller adjusts the output power parameter to an appropriate level that can be combined with power storage device output to supply the load, thus adapting to different operational requirements.
2Reliability
If the power storage device is discharged during power failure, then the load can be supplied, but the use efficiency of the solar battery is reduced when solar power is insufficient
Solution Approach 1:
The controller dynamically changes the operating parameters of both the solar battery and power storage device based on real-time conditions. During power failure, it adjusts the solar battery output to a first power level and coordinates the power storage device discharge rate to complement solar output, ensuring both resources are utilized efficiently to maintain load supply and maximize solar battery usage.
Solution Approach 2:
The controller implements feedback control by continuously monitoring the power output of the solar battery, the state of charge of the power storage device, and the load requirements. Based on this feedback, it adjusts the power distribution strategy to optimize solar battery utilization while ensuring continuous load supply during power failure conditions.
3Manufacturing precision
If the second power converter maintains power storage device voltage at reference voltage during normal state, then the power storage device is properly charged, but during power failure the voltage control must be adjusted to coordinate with solar battery output
Solution Approach 1:
The voltage control strategy is dynamically adjusted based on system state. During normal operation, the second power converter maintains the power storage device voltage at the first reference voltage for optimal charging. During power failure, the controller dynamically changes the voltage control target to a second reference voltage and coordinates with the solar battery output to ensure stable power supply to the load, thus achieving both precision and adaptability.
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
Enhances the use efficiency of the solar battery during AC power failures by effectively utilizing both solar-generated and stored power, even when solar power generation is insufficient, ensuring continuous operation of the load.
Implementation Method 1
a first power converter that maximizes solar battery output in normal conditions and controls it to output less power than the load during AC power failures
Implementation Method 2
a first power converter that maximizes solar battery output in normal conditions and controls it to output less power than the load during AC power failures
Implementation Method 3
at least one second power converter that provides and receives power between at least one power storage device and the power feed line
Data Source
AI summary
A DC power feeding device includes a power feed line connected to a DC load, a first DC/DC converter provided between a solar battery and the power feed line, and a second DC/DC converter provided between a battery and the power feed line. A first controller controls the first DC/DC converter such that maximum power tracking control of the solar battery is performed in a normal state of a commercial AC power source. The first controller controls the first DC/DC converter such that the solar battery outputs a power smaller than a load power in a power failure. A second controller controls the second DC/DC converter such that the battery is charged in the normal state of the commercial AC power source. The second controller controls the second DC/DC converter such that DC voltage on the power feed line attains a reference voltage in the power failure.