Dynamic Mode Assignment for Isolated Grid Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing energy supply systems for island grids face inefficiencies and stability challenges due to varying power requirements and environmental factors, particularly in isolated networks like ships and pipeline stations, where energy management and distribution are complex and require optimized operating modes for generators to ensure efficient and stable energy supply.
Innovation Solution
An energy supply system with a centralized or distributed energy management system that dynamically assigns operating modes to multiple power generation devices, such as diesel and gas turbines, and generators, allowing for efficient voltage and frequency regulation, reactive power compensation, and load distribution, ensuring optimal operation points and redundancy to maintain grid stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple power generation devices operate in fixed operating modes, then system simplicity is maintained, but energy efficiency and grid stability deteriorate under varying power requirements
Solution Approach 1:
The patent implements dynamic operating mode assignment where the energy management system continuously monitors grid conditions and dynamically switches generators between ISO mode (isochronous frequency control) and DROOP mode (load sharing) based on real-time power requirements and stability needs, allowing the system to adapt to varying loads while optimizing energy efficiency
Solution Approach 2:
The system changes operational parameters by adjusting which generators operate in ISO mode versus DROOP mode. The energy management system modifies operating parameters such as frequency control settings and reactive power compensation levels based on grid conditions, enabling flexible adaptation without physical system changes
2Loss of energy
If power generation devices operate at optimal operating points, then energy efficiency is improved, but response speed to load changes and grid stability deteriorate
Solution Approach 1:
The energy management system maintains generators in DROOP mode as a preliminary prepared state, which allows rapid response to load changes. When stability threats are detected, the system can quickly switch to ISO mode for frequency control, or activate reserve capacity, having these responses pre-configured based on predicted grid conditions
Solution Approach 2:
The system implements continuous feedback monitoring of grid frequency, voltage, and load conditions. The energy management system uses this feedback to dynamically adjust operating modes, switching from efficient DROOP mode to stability-critical ISO mode when frequency deviations occur, and vice versa when the grid is stable, creating a closed-loop control system
3Reliability
If operating modes are dynamically assigned based on grid conditions, then energy efficiency and grid stability are improved, but system complexity increases
Solution Approach 1:
The energy management system performs multiple functions through a single integrated platform: it monitors grid conditions, assigns operating modes to generators, controls reactive power compensation, manages power reserves, and coordinates startup/shutdown sequences. This multi-functionality reduces the need for separate specialized systems while achieving comprehensive grid management
4Speed
If power reserves are maintained for quick response, then response speed to load changes is improved, but energy efficiency and operational costs worsen
Solution Approach 1:
The system maintains partial power reserve capacity by operating some generators in DROOP mode with headroom above current load requirements. This partial reserve provides quick response capability for load changes while avoiding the excessive energy consumption of running all generators at full capacity, achieving a balance between response speed and efficiency
Data Source
Figure 1~2
Figure 3
AI summary
An energy supply system (1) which comprises an energy management system (2), a first power generating device (7), and a second power generating device (8) has a first operating state (17) and a second operating state which are temporally different. In the first operating state, a first operating mode (19) is assigned to the first power generating device (7), and a second operating mode (20) is assigned to the second power generating device (8). In the second operating state (18), the first operating mode (19) is assigned to the second power generating device (8), and the second operating mode (20) or a different operating mode (26) is assigned to the first power generating device (7). By virtue of the assignment of different modes, the energy supply system (1) is optimized.