PV Power Control System with Battery Fluctuation Feedback
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Solution Overview
Problem
In distributed power generation systems with storage batteries, the connection to the grid being disconnected during blackouts leads to unstable power supply from photovoltaic modules due to rapid output fluctuations and insufficient spare power for charging batteries, especially when load power exceeds generation.
Innovation Solution
A control system with a first controller managing power supply to loads and a second controller for storage battery charge/discharge, which detects output fluctuations and adjusts charging power to stabilize power supply by discharging the battery when load power exceeds generation, ensuring stable power delivery even without grid connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If charging power to storage battery is increased during self-sustaining operation, then energy storage capacity is improved, but power supply stability deteriorates due to output fluctuation from photovoltaic module
Solution Approach 1:
The second controller detects output fluctuation from the photovoltaic module and feeds back this information to control the charge/discharge of the storage battery. This feedback mechanism allows the system to adjust charging power dynamically based on actual output conditions, preventing overcharging when output is unstable and ensuring power supply stability while maximizing energy storage when conditions permit.
2Reliability
If storage battery is added as additional load to power supply apparatus, then power supply security during blackout is improved, but total load power increases causing frequent power interruptions
Solution Approach 1:
The system dynamically adjusts the charge/discharge control of the storage battery based on real-time detection of output fluctuation from the photovoltaic module. During self-sustaining operation, the controller monitors output stability and adjusts charging power accordingly - reducing or暂停 charging when output fluctuation indicates impending power stop, and allowing normal charging when output is stable. This dynamic control ensures the storage battery provides power supply security without causing frequent interruptions.
3Speed
If output power from photovoltaic module increases rapidly to follow load power, then responsiveness to load demand is improved, but power generation exceeds capacity leading to safety control shutdown
Solution Approach 1:
The second controller performs preliminary detection of output fluctuation from the photovoltaic module before power generation capacity is exceeded. By monitoring changes in output power and detecting fluctuation patterns early, the controller can anticipate when the photovoltaic module is approaching its maximum capacity. This allows the system to take preliminary action by adjusting storage battery charge/discharge control to compensate for upcoming power shortages, preventing the need for safety control shutdown and maintaining continuous power supply.
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
The system ensures stable power supply from photovoltaic modules to loads during self-sustaining operations by dynamically managing storage battery charge/discharge, preventing power interruptions and maintaining efficient energy distribution.
Implementation Method 1
power generation by sunlight... power generated by a photovoltaic module
Implementation Method 2
excessively generated power is previously stored in a storage battery
Data Source
AI summary
In a power control system including a first controller configured to control supply of power from a photovoltaic module to a plurality of loads and a second controller configured to control charge/discharge of a storage battery, which is one of the plurality of loads, the first controller controls output following power consumption by the plurality of loads, and the second controller increases, during a self-sustaining operation, charging power of the storage battery and detects output fluctuation from the photovoltaic module or from the first controller along with the increase in the charging power, then based on the detected output fluctuation, controls charge of the storage battery, thus, even if connection to the grid is disconnected, supply power may be replenished by the load power used for supply to the predetermined loads, thereby allowing a stable power supply to the other loads.