Grid Energy Storage Branch Activation by State of Charge
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Solution Overview
Problem
Energy storage systems connected to power grids face inefficiencies and potential damage due to intermittent renewable energy sources, leading to instability and performance losses, especially during periods of under-supply when power conversion systems operate outside their useful range.
Innovation Solution
A power managing method that sequences energy storage devices based on their state of charge, sets electrical power thresholds, and activates a calculated number of devices to optimize performance, minimize aging, and maintain uniform state of charge, ensuring efficient operation within useful ranges and adapting to unavailable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical power is distributed evenly to all energy storage devices during under-supply periods, then all devices can potentially contribute to power regulation, but power conversion systems operate outside their useful operating range leading to energy loss
Solution Approach 1:
The patent segments the energy storage devices into different operational groups based on their state of charge. Instead of uniformly distributing power requests to all devices, the system selectively activates specific devices (e.g., those with moderate state of charge) to operate within their useful ranges, while leaving other devices inactive or in standby mode. This segmentation resolves the contradiction by ensuring that only devices capable of efficient operation contribute to power regulation during under-supply periods.
2Loss of energy
If electrical power is concentrated on a limited number of energy storage devices, then power conversion systems operate within useful ranges improving efficiency, but the number of available devices for power regulation is reduced
Solution Approach 1:
The patent implements dynamic allocation of power requests to energy storage devices based on real-time state of charge conditions. The system continuously monitors device states and dynamically adjusts which devices are activated and how much power they should provide or store. This dynamic approach allows the system to concentrate power requests on devices operating within useful ranges while maintaining the overall power regulation capability through flexible reconfiguration of device participation.
3Productivity
If all energy storage devices are activated to meet high power demands, then power regulation capability is maximized, but devices experience accelerated aging and potential damage
Solution Approach 1:
The patent applies local quality by treating different energy storage devices with different operational characteristics based on their individual state of charge. Rather than uniformly utilizing all devices, the system selectively engages specific devices with appropriate state of charge levels for specific tasks. This localized approach ensures that devices are operated within optimal ranges, preventing accelerated aging and damage while maintaining sufficient power regulation capability through coordinated device selection.
4Power
If electrical power is distributed to maximize system capacity, then the system can handle higher power requests, but performance losses increase due to operation outside useful ranges
Solution Approach 1:
The patent changes the operational parameters of energy storage devices based on system power requirements and device state of charge. By adjusting which devices are activated and at what power levels, the system optimizes the balance between total power capacity and operational efficiency. The control system modifies operational parameters dynamically, ensuring that devices contributing to high power requests are operating within their useful ranges, thereby minimizing performance losses while maintaining adequate system power capacity.
Data Source
AI summary
The invention relates to a power managing method of an energy storage system (1) coupled to a power grid, the energy storage system (1) including a predetermined number of energy storage devices (A-K) and power conversion systems (PCS1, PCSn) respectively coupled to at least one associated energy storage device (A-K). The method comprises: —sequencing the energy storage devices (A-K) on the basis of their respective state of charge, —determining a request to absorb or to provide electrical power, —setting at least one electrical power threshold to be absorbed or provided per energy storage device, —depending on the electrical power requested and said electrical power threshold set, calculating a number of energy storage devices to be activated, —activating the calculated number of energy storage devices and their associated power conversion systems (PCS1, PCSn), according to the sequence ranking. The invention also relates to a system for implementing said method.