Energy Storage Module Dispatch for Grid Frequency Balancing
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Solution Overview
Problem
Existing energy storage systems struggle to maintain the dynamic balance of electricity quantity and grid frequency effectively, leading to inefficiencies and reduced lifespan.
Innovation Solution
A control method for an energy storage system that regulates grid frequency by controlling the charging and discharging of energy storage units based on their electricity quantity, using a sorting mechanism to determine which units charge or discharge, thereby maintaining a balanced load status and optimizing power dispatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If energy storage units operate without considering their electricity quantity status, then grid frequency regulation can be achieved, but the energy storage units will experience full-load or low-load conditions that reduce their lifespan
Solution Approach 1:
The patent applies local quality by differentiating the operational status of each energy storage unit based on its electricity quantity. The controller identifies specific units with electricity quantities within the target range (30%-70%) and prioritizes them for frequency regulation operations, while excluding units in full-load or low-load states. This selective approach ensures that only suitable units participate in grid frequency regulation, preventing damage to units with extreme electricity quantities while maintaining regulation capability.
2Adaptability or versatility
If energy storage units are controlled to maintain dynamic balance of electricity quantity, then flexibility of power dispatch is enhanced, but the system complexity increases due to sorting and selection mechanisms
Solution Approach 1:
The patent segments the energy storage units into different groups based on their electricity quantity status. The controller sorts all energy storage units according to their electricity quantities and identifies those within the target range (30%-70%). This segmentation allows the system to selectively control appropriate units for frequency regulation, enhancing power dispatch flexibility while managing control complexity through systematic categorization rather than attempting to control all units uniformly.
3Speed
If all energy storage units are used for frequency regulation, then the response speed to grid demands is maximized, but the risk of overloading or underloading individual units increases
Solution Approach 1:
The patent applies partial action by selecting only a subset of energy storage units (those with electricity quantities within the target range of 30%-70%) to participate in frequency regulation, rather than utilizing all available units. This selective approach ensures that the participating units operate within safe and efficient boundaries, maintaining high response speed while avoiding the risks of overloading or underloading individual units. The system achieves adequate regulation capability through the subset without compromising unit reliability.
Data Source
AI summary
An energy storage system and a control method thereof are provided. The control method includes steps of: (a) providing an energy storage system including N energy storage modules; (b) obtaining a first sequence and a second sequence by sorting the N energy storage units based on the quantity of electricity in descending order and ascending order respectively; (c) determining a required power of the power grid according to a grid frequency; (d) when the required power is positive, controlling first X energy storage units in the first sequence to discharge for collectively providing an electrical energy, having same magnitude with the required power, to the power grid; and (e) when the required power is negative, controlling first Y energy storage units in the second sequence to collectively receive an electrical energy, having same magnitude with the required power, from the power grid for charging.