Battery Charge Discharge Control for Excess Solar Power Management
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Solution Overview
Problem
Excess power generated by solar batteries during periods of high sunlight cannot be effectively utilized due to voltage limitations in the power system, leading to waste, as homes cannot output excess power to the grid when the line voltage reaches its upper limit, and electric vehicle batteries are often fully charged at night, making them unavailable for storing this excess energy.
Innovation Solution
A charge/discharge control apparatus that calculates expected power generation and consumption, determines excess power periods, and controls battery charging/discharging to optimize the battery's state at the start of excess power periods by either charging or discharging to match the expected excess power amount, ensuring effective use of excess energy without exceeding the power line voltage limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If each home outputs excess power to the power system, then the excess power can be utilized by the power system, but the power line voltage reaches the upper limit and many homes cannot output their excess power
Solution Approach 1:
The patent introduces a battery as an intermediary energy storage device between the solar battery and the power system. The battery absorbs excess power when the power line voltage is high, preventing voltage overload, and releases power when needed, enabling homes to utilize excess power without exceeding power line voltage limits.
Solution Approach 2:
The patent performs preliminary charging of the battery during nighttime when electricity rates are low and power demand is high. This preliminary action ensures the battery is ready to absorb excess power during daytime when solar generation is high, preventing power loss without affecting power line voltage stability.
2Loss of energy
If the battery is charged during nighttime when electricity fee is cheap, then the battery is fully charged, but the battery becomes unavailable for storing excess power generated during daytime
Solution Approach 1:
The patent dynamically adjusts the battery's charge/discharge operations based on real-time conditions including power line voltage levels, solar power generation amounts, and electricity pricing. The control section determines whether to charge, discharge, or maintain battery state, making the battery adaptable to varying conditions rather than following a fixed charging schedule.
Solution Approach 2:
The patent changes the operational parameters of the battery based on different time periods and power system conditions. The battery's state of charge is adjusted according to power line voltage levels, solar generation forecasts, and electricity rates, transforming the battery from a static energy storage device to a dynamic resource that adapts to system needs.
3Loss of energy
If the battery remaining amount is increased to store more excess power, then more excess power can be absorbed, but the vehicle may not have enough power for operation
Solution Approach 1:
The patent implements a feedback control mechanism where the control section continuously monitors the battery's state of charge, power line voltage levels, solar power generation forecasts, and vehicle power requirements. Based on this feedback, the system dynamically adjusts the battery's charge/discharge operations to maintain an optimal balance between absorbing excess power and ensuring sufficient power for vehicle operation.
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 solution enables the effective utilization of excess power by adjusting the battery's state to align with expected excess energy production, preventing waste and optimizing energy use without interfering with the vehicle's operation, thereby reducing reliance on the power grid and lowering electricity costs.
Implementation Method 1
a battery charging/discharging control section that controls charge/discharge of a battery so that a remaining amount of the battery at the beginning of the excess power period becomes an amount resulting from subtracting the expected excess power amount from a pre-set charge amount
Data Source
AI summary
Included are a power-generation amount calculating section calculating an expected amount of power-generation being an amount of power generated by a power generating section in the future, for each predetermined period, a power-consumption amount calculating section calculating an expected amount of power-consumption being an amount of power consumed by a power load, for the predetermined period, an excess power period determining section determining an excess power period, an excess power amount calculating section calculating an expected excess power amount, and a charge/discharge control section controlling charge/discharge of a battery so that a remaining amount of the battery at the beginning of the excess power period becomes an amount resulting from subtracting the expected excess power amount from a pre-set charge amount.