Frequency Control Using Standby Power Unit Storage Devices
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Solution Overview
Problem
Existing smart grid systems fail to maintain a constant frequency in power supply due to variations in load, leading to inefficient energy usage and degraded power quality, as they do not effectively utilize stored power to adjust frequency.
Innovation Solution
A system comprising a power supplying unit, a systematic unit, a standby power unit with storage devices, and a grid unit that controls frequency by calculating the state of charge (SOC) of storage devices to prioritize charging and discharging, allowing for real-time adjustments to maintain a stable frequency without additional infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new mass infrastructure is constructed to store power and improve power quality, then power quality and fluidity are improved, but construction cost and device complexity increase significantly
Solution Approach 1:
The standby power unit originally designed for backup power supply is made to perform multiple functions: it serves as both a backup power source and a frequency control device. The controlling unit utilizes the SOC information of storage devices to participate in frequency adjustment, enabling the same infrastructure to provide both reliability and frequency stability without additional dedicated facilities.
Solution Approach 2:
The system utilizes existing SOC information that is already collected for backup power management purposes and repurposes it for frequency control. The standby power unit self-adjusts its charging and discharging operations based on frequency deviations, eliminating the need for separate control infrastructure.
2Stability of the object's composition
If storage devices are used for frequency control by charging and discharging, then frequency stability is improved, but energy loss increases due to charging-discharging cycles
Solution Approach 1:
The system activates storage devices for frequency control only when frequency deviations exceed predetermined thresholds. The controlling unit selectively charges or discharges storage devices based on the direction and magnitude of frequency deviation, rather than continuously cycling them, thereby reducing unnecessary energy loss while maintaining frequency stability when needed.
3Measurement precision
If SOC information is collected and used for frequency control, then frequency adjustment precision is improved, but system complexity and control difficulty increase
Solution Approach 1:
The controlling unit continuously monitors frequency information and SOC information, and uses this feedback to automatically adjust the charging and discharging operations of storage devices. When frequency deviates from the standard value, the system responds by charging (when frequency is high) or discharging (when frequency is low), creating a closed-loop control system that improves precision without requiring complex manual intervention.
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 cost-effective frequency control by optimizing power quality and reducing investment costs, allowing for rapid adaptation to frequency changes using storage devices as virtual frequency controllers, thereby improving energy efficiency and fluid power usage.
Implementation Method 1
at least one storage device storing the power generated from the power supplying unit
Implementation Method 2
the at least one storage device may be discharged when a frequency supplied to the systematic unit is decreased below a predetermined value and may be charged when the frequency supplied to the systematic unit is increased above the predetermined value
Data Source
AI summary
Provided are a system and a method for controlling a frequency. The system for controlling the frequency includes: at least one power supplying unit generating power; at least one systematic unit consuming the power generated from the power supplying unit; at least one standby power unit storing the power generated from the power supplying unit and including at least one storage device; and at least one grid unit connecting the power supplying unit, the systematic unit, and the standby power unit to one another and controlling a frequency of the systematic unit.