Multi-Port Energy Router Stability Recovery via Impedance Reshaping
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Solution Overview
Problem
Current energy router systems face challenges in stability identification and recovery, particularly due to the complex interactions between their sub-systems, leading to instability issues that are difficult to address using existing impedance-based stability analysis methods.
Innovation Solution
A self-mutual-group multilevel stability identification and stability recovery method is introduced, which involves system parameter initialization, construction of Euler-Lagrange mathematical models, and use of transfer functions to assess stability, followed by a three-layer impedance reshaping strategy to ensure system stability across different hierarchies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional impedance-based stability analysis methods are used, then stability evaluation can be performed, but conservatism in stability evaluation occurs and coupling stability problems cannot be effectively solved
Solution Approach 1:
The patent segments the energy router system into three hierarchical levels: self-hierarchy (individual converter modules), mutual-hierarchy (converter groups with coupling), and group-hierarchy (overall system). Each level has dedicated stability identification methods, allowing precise analysis without conservatism while managing complex coupling relationships through structured decomposition.
2Measurement precision
If complex stability identification methods are implemented to solve coupling stability problems, then stability accuracy improves, but system complexity and computational burden increase
Solution Approach 1:
The patent introduces a hierarchical dimension to stability analysis, organizing the complex multi-port energy router system into three distinct levels (self-, mutual-, and group-hierarchy). This dimensional organization transforms an intractable complex problem into a series of manageable sub-problems, each with appropriate analysis methods, reducing overall computational burden while maintaining accuracy.
Solution Approach 2:
The patent employs dynamic impedance characterization that adapts to different operating conditions and hierarchy levels. The stability identification methods dynamically adjust their complexity based on the specific hierarchy being analyzed, using simplified models where appropriate and more sophisticated analysis only where needed, optimizing the balance between accuracy and computational effort.
3Reliability
If multi-level stability recovery control is implemented, then system stability is ensured, but control complexity and implementation difficulty increase
Solution Approach 1:
The stability recovery control is segmented into three hierarchical levels corresponding to the stability identification framework. Each level has dedicated control strategies that address specific types of instability, allowing implementation of comprehensive stability recovery without requiring a single overly complex control system. This modular approach simplifies implementation while ensuring overall system stability.
Data Source
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AI summary
The present invention provides a self-mutual-group multilevel stability identification and stability recovery method for a multi-port energy router, and relates to the technical field of Energy Internet. The method comprises a stability identification method for a dual energy flow multi-port energy router based on an impedance criterion, and an impedance reshaping stability recovery control strategy. The method comprises steps of firstly, identifying respective stability of three sub-systems of a front-end DC converter, a dual active bridge bidirectional DC-DC converter and a back-end AC/DC converter in energy routers; then obtaining the single stability of a single dual energy flow multi-port mutual-coupling energy router through an MFC fractional criterion, and further obtaining the stability of a clustered energy router through an impedance flow diagram; and finally proposing a three-layer impedance reshaping stability recovery control strategy for three instability phenomena, and enabling the system to be stable through a parameter self-regulation technology, a passive coupling impedance reshaping technology and a source side cascade impedance reshaping technology. The method can guarantee the whole stability of the Energy Internet system and realize expandability, plug-and-play properties and safe and stable operation of the system.