Storage Battery Control for Peak Shaving and Surplus Solar Use
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Solution Overview
Problem
Existing power control systems struggle to simultaneously ensure a dischargeable amount for peak suppression of purchased electrical power and a chargeable amount for home consumption of excess renewable energy, especially when the occurrence probabilities of these events are closely matched.
Innovation Solution
A power control system that includes a monitoring unit, a storage amount acquisition unit, and a storage amount target value setting unit, which work in conjunction with a power storage control unit to execute specific processing modes: discharging during high purchased power thresholds, charging during excess renewable energy generation and low purchased power thresholds, and adjusting storage battery levels to target values in other scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage battery is fully charged in advance to ensure dischargeable amount for peak suppression, then peak suppression capability is improved, but the ability to consume excess renewable energy at home deteriorates
Solution Approach 1:
The patent implements dynamic switching between different control modes (first control mode for peak suppression, second control mode for home consumption) based on real-time conditions. The control unit determines which mode to execute by evaluating whether the generated electrical power exceeds a reference value, allowing the system to adapt its charging/discharging strategy dynamically rather than following a fixed schedule.
Solution Approach 2:
The system changes the control parameter (control mode) based on the relationship between generated power and reference value. When generated power exceeds the reference value, the system switches to the second control mode to consume excess power at home; otherwise, it operates in the first control mode for peak suppression, thereby adjusting system behavior according to varying power generation conditions.
2Quantity of substance
If the storage battery is emptied in advance to ensure chargeable amount for home consumption, then home consumption capability is improved, but peak suppression capability deteriorates
Solution Approach 1:
The system dynamically adjusts its operation by switching between control modes based on real-time power generation conditions. When the generated power exceeds the reference value, the system prioritizes home consumption (second control mode); when it does not, the system prioritizes peak suppression (first control mode), ensuring both capabilities are maintained under appropriate conditions.
Solution Approach 2:
The control unit changes the operational parameter (control mode) based on the comparison between generated electrical power and reference value. This parameter change enables the system to flexibly allocate storage battery operations between peak suppression and home consumption, resolving the contradiction by making the system's behavior conditional rather than fixed.
3Ease of operation
If control mode switching is based on date/time, then simple operation is achieved, but adaptability to changing situations deteriorates
Solution Approach 1:
The control unit continuously monitors the generated electrical power and compares it with the reference value to determine the appropriate control mode. This feedback mechanism allows the system to automatically adapt to changing power generation situations without requiring manual intervention or complex scheduling, thereby maintaining ease of operation while improving adaptability.
Solution Approach 2:
The system performs self-adjustment by automatically determining which control mode to execute based on real-time power generation conditions. The control unit independently evaluates whether generated power exceeds the reference value and switches modes accordingly, eliminating the need for external scheduling or manual control while maintaining simple operation.
Data Source
AI summary
A power control system and method for suppressing purchase power peaks or controlling surplus power household consumption according to changes. The power control system comprises a monitoring unit, an electricity storage quantity acquisition unit, and an electricity storage controller. The monitoring unit monitors a generated power quantity which an electricity generator generates using renewable energy and a purchase power quantity which a consumer purchases via a power grid. The electricity storage controller executes processes of discharging power from an electricity storage cell if the purchase power quantity is greater than or equal to a first threshold value; charging the storage cell if the generated power quantity is greater than zero and the purchase power quantity is less than or equal to a second threshold value less than the first threshold value; and charging and discharging the storage cell such that the acquired electricity storage quantity reaches a target value.