Hierarchical Power Management for Grid Frequency Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power grid frequency control systems for multiple energy storage systems lack an efficient hierarchical control structure and data analysis-based energy use ratio determination for effective frequency management, particularly in frequency response and regulation.
Innovation Solution
A power grid frequency control system employing a hierarchical control structure with local management systems, energy storage system controllers, and a power management system to determine control parameters and energy use ratios, enabling participation in frequency control markets and optimizing output values for frequency response and regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hierarchical control structure is implemented for multiple energy storage systems, then system reliability and flexibility are improved, but device complexity increases
Solution Approach 1:
The control system is divided into three hierarchical levels: local management systems (LMS) that manage individual energy storage systems, an energy storage system controller (ESS controller) that coordinates multiple LMS units, and a power management system (PMS) that provides overall system management. This segmentation allows each layer to operate semi-independently, improving reliability while distributing complexity across manageable modules.
Solution Approach 2:
The ESS controller acts as an intermediary layer between the LMS units and the PMS, translating high-level power management commands into coordinated control signals for multiple energy storage systems. This intermediary structure simplifies the overall control architecture by providing a clear interface between local and central management, reducing the complexity burden on both ends.
2Measurement precision
If data analysis is used to determine energy use ratios for frequency response and regulation, then frequency control accuracy is improved, but measurement and analysis complexity increases
Solution Approach 1:
The system continuously monitors frequency deviations and energy storage system states, using this feedback data to dynamically adjust the energy use ratios for frequency response and regulation. The PMS collects operational data from ESS controllers and LMS units, analyzes frequency control performance, and refines allocation strategies based on actual system behavior, improving accuracy through iterative learning.
Solution Approach 2:
The system automatically determines energy use ratios through internal data analysis without requiring external intervention. The PMS utilizes built-in data processing capabilities to analyze frequency deviations, energy storage states, and operational patterns, then autonomously adjusts control parameters and energy allocation ratios based on the analysis results.
3Productivity
If multiple energy storage systems are coordinated through hierarchical control, then productivity and operation rate are improved, but device complexity increases
Solution Approach 1:
Multiple energy storage systems are merged into a coordinated fleet managed by the hierarchical control structure. The LMS units aggregate individual ESS capabilities, the ESS controller combines their output to meet frequency control requirements, and the PMS integrates them into the broader power grid ecosystem. This merging allows the systems to operate more efficiently collectively than individually, improving overall productivity.
Solution Approach 2:
The hierarchical control structure enables dynamic coordination of multiple energy storage systems, allowing real-time adjustment of power output and energy allocation based on grid frequency conditions and system states. The control parameters and energy use ratios are dynamically optimized to maximize operational efficiency and response capability across the entire energy storage fleet.
Data Source
AI summary
The present invention relates to a power management system (PMS) for multiple energy storage systems (ESS) that is for integrated management of the system having multiple ESS for controlling a frequency and having a hierarchical control structure. The PMS for ESS comprises: a plurality of ESS; a local management system (LMS) for managing one or more ESS of the plurality of ESS for each local unit; an ESS Controller (ESSC) for general management of the LMS, judging a state of the LMS and determining an output value of one or more ESS in the LMS, and transmitting the determined output value to the respective ESS; and a PMS for general management of the entire system comprising the plurality of ESS, the LMS and the ESSC, judging the state of the entire system and participating in a power grid frequency control market through a grid operator contract, controlling the output of the LMS, and adjusting a control parameter for output control.