Sub-grid Controller for Interconnected Grid Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrical grids face challenges in maintaining stability with the increasing integration of renewable energy sources, as the complexity of managing a large number of distributed power generators exceeds the capabilities of traditional simulation techniques.
Innovation Solution
A sub-grid controller is introduced to manage power generators, loads, and subnetworks within an interconnected grid by using sensor-detected internal and external variables to calculate a control vector, allowing for dynamic behavior alignment with a defined target behavior, thereby enhancing grid stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional simulation techniques are used to analyze grid stability, then grid stability can be maintained with a small number of conventional power generators, but the technique becomes inadequate when a large number of distributed renewable power generators are integrated
Solution Approach 1:
The patent divides the large-scale electrical grid into multiple sub-grids, each managed by a distributed controller. This segmentation allows the complex system to be controlled through simpler local controllers rather than requiring centralized simulation of the entire grid, thereby increasing adaptability to distributed renewable generators while reducing overall computational complexity.
Solution Approach 2:
The patent introduces simplified interface models that act as intermediaries between distributed renewable generators and the grid control system. These interface models aggregate the behavior of multiple distributed generators, allowing the control system to manage them as unified entities rather than individually, thus enhancing versatility while managing computational complexity.
2Reliability
If detailed models of conventional power generators are used for stability analysis, then accurate grid stability control is achieved, but the approach cannot scale to handle large numbers of distributed generators
Solution Approach 1:
The patent employs simplified interface models that replicate the essential behavior of distributed generator interfaces without requiring detailed models of each individual generator. This copying approach maintains sufficient accuracy for stability control while enabling scalable management of large numbers of distributed generators.
Solution Approach 2:
The patent applies partial modeling by capturing only the essential characteristics of distributed generators needed for stability analysis, rather than using complete detailed models. This partial action approach provides sufficient reliability for grid stability while dramatically improving scalability to handle large numbers of distributed generators.
3Stability of the object's composition
If conventional power generators are operated according to active-power and reactive-power rules, then grid stability is achieved, but the method becomes impractical with increasing numbers of distributed generators
Solution Approach 1:
The patent merges the control of multiple distributed generators through centralized coordination at the sub-grid level. By aggregating control functions and using simplified interface models, the system maintains stability through coordinated action rather than individual control, reducing overall control complexity while preserving grid stability.
Data Source
AI summary
Disclosed is a subnetwork controller for a subnetwork within an interconnected grid. The controller controls power generators, subnetworks, or loads of the subnetwork in accordance with sensor-captured internal measured variables and sensor-captured external measured variables as well as external controlled variables of the subnetwork in such a way that a dynamic behavior of the subnetwork in relation to its adjacent subnetworks corresponds to a defined desired behavior.