Power Control Device Stabilizing Voltage Fluctuations in Renewable Energy Systems
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Solution Overview
Problem
In power supply systems using renewable energy, fluctuations in power generation due to unstable sunlight and wind intensity lead to voltage fluctuations, causing instability in power supply to load devices, especially when the load is single-phase, resulting in uneven battery deterioration and reduced battery lifespan.
Innovation Solution
A power control device that acquires voltage and deterioration information, compares it with a reference voltage to detect fluctuations, and adjusts the charge or discharge time of storage batteries to stabilize the voltage applied to the capacitor, thereby reducing battery deterioration and ensuring stable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied from storage batteries via a capacitor to operate appliances, then stable power supply is achieved, but voltage fluctuation occurs due to mismatch between power generation and consumption
Solution Approach 1:
The control unit continuously monitors the voltage across the capacitor and adjusts the charging/discharging current of storage batteries in real-time based on detected voltage fluctuations, creating a closed-loop feedback system that maintains voltage stability
Solution Approach 2:
The system dynamically adjusts the operating parameters (charging/discharging current) of storage batteries according to real-time conditions, transitioning from static power distribution to dynamic control that responds to voltage fluctuations
2Reliability
If increased charging/discharging frequency is applied to storage batteries to match power supply and consumption, then power balance is improved, but battery deterioration accelerates
Solution Approach 1:
The control unit changes operating parameters (charging/discharging current magnitude and duration) of storage batteries based on detected voltage fluctuations, adjusting these parameters dynamically to balance power while minimizing stress on battery components
Solution Approach 2:
The system applies different charging/discharging strategies to individual storage batteries based on their specific states, allowing customized control that maintains overall power balance while protecting individual battery health
3Duration of action of stationary object
If uniform remaining capacity distribution is maintained among storage batteries, then battery lifespan is extended, but power distribution flexibility is reduced
Solution Approach 1:
The control unit dynamically adjusts power distribution ratios among storage batteries in real-time, transitioning from fixed uniform distribution to flexible dynamic allocation that responds to instantaneous power needs while monitoring battery health
Solution Approach 2:
The control unit proactively monitors the state of charge of storage batteries and pre-adjusts charging/discharging strategies to prevent excessive discharge or charge cycles that would accelerate deterioration, maintaining uniform capacity distribution as a preventive measure
Data Source
AI summary
The control device includes: an acquisition unit which acquires voltage information indicating a voltage applied to a capacitor provided between a power generation unit and a load via first and second power supply lines, and deterioration information indicating a state of deterioration of a storage battery connected to the power generation unit; a determination unit which compares the acquired voltage information with a reference voltage so as to detect a fluctuation of the voltage, and determines power to be outputted so as to suppress the fluctuation; and an informing unit which informs the storage battery of a current value corresponding to the power to be outputted, wherein the determination unit detects the state of deterioration of the storage battery using the deterioration information, and determines power to be outputted in accordance with the state of deterioration.