Storage Battery Control Device for Surplus Power Management
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Solution Overview
Problem
Conventional storage-battery charge/discharge systems face inefficiencies when surplus power generated by photovoltaic power generation cannot be sold to the system power supply due to high voltage or when the battery is already fully charged, leading to wasted energy.
Innovation Solution
A storage-battery control device that includes load-power and PV-power prediction devices, along with a system controller, to forecast and manage the charge state of the storage battery, allowing surplus power to be charged even when it cannot be sold to the system power supply by predicting load and generation patterns and controlling the battery's state accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If surplus power is sold to the system power supply, then economic efficiency is improved, but when voltage becomes higher than predetermined voltage, power cannot be sold to the system power supply
Solution Approach 1:
The storage battery serves as an intermediary between the photovoltaic power generation system and the system power supply. When the system power supply voltage is high and cannot accept surplus power, the storage battery absorbs this surplus power, preventing direct injection into the high-voltage system while still utilizing the generated energy.
Solution Approach 2:
The control device predicts future system power supply voltage conditions and proactively charges the storage battery with surplus power before voltage rise occurs. This preliminary action ensures that when voltage becomes too high for grid injection, the power has already been stored and can be used later when conditions are favorable.
2Reliability
If storage battery is kept in full charge state, then power availability is ensured, but surplus power cannot be charged into the storage battery when already full
Solution Approach 1:
The control device dynamically adjusts the storage battery charge state based on predictions of future power needs and system conditions. Rather than maintaining a static full charge state, the system optimizes the charge level to balance power availability with the ability to accept surplus power, adjusting the charge state as conditions change.
Solution Approach 2:
The control device continuously monitors the storage battery charge state, system power supply voltage, and power generation/consumption patterns. This feedback mechanism allows the system to make real-time decisions about charging and discharging, ensuring that the battery is charged when it can accept power and discharged when power is needed, rather than simply maintaining full charge.
3Device complexity
If conventional charge control methods are used, then charging process is simple, but cannot control charge state to accommodate surplus power when system voltage is high
Solution Approach 1:
The control device performs preliminary predictions of system power supply voltage and power generation/consumption patterns before making charging decisions. This advance planning allows the system to prepare the storage battery to receive surplus power at the optimal moment, rather than reacting after voltage conditions have already changed.
Solution Approach 2:
The charge control system transitions from a static, rule-based approach to a dynamic, prediction-based approach. The control device continuously adapts charging strategies based on predicted future conditions, allowing the system to respond flexibly to changing voltage conditions and power generation patterns while maintaining manageable complexity through automated decision-making.
Data Source
AI summary
The present invention provides a storage-battery control device 1 capable of enhancing economical efficiency by controlling charge state of a storage battery 12 so that surplus power generated by photovoltaic generation can be entirely charged into the storage battery 12 even in a case where power cannot be sold to a system power supply 50. A storage-battery control device 1 according to the present invention includes a load-power prediction device 4 to predict load power, a PV-power prediction device 3 to predict generated power by photovoltaic power generation, and a system controller 2 to obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segment 60 having a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment 60, and when the predicted charge amount is positive, to control the charge state of a storage battery 12 at the start point so that the predicted charge amount can be charged in the prediction segment 60, wherein an end point of the prediction segment 60 is a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching the maximum value of the generated power.