Islanded Microgrid Power Management for Grid Stability
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Solution Overview
Problem
Dynamic Demand Control (DDC) systems face challenges in implementation due to utility operators' reluctance to vary grid frequency, which is designed for constant operation, and the need for significant investment for large-scale implementation, limiting the adoption of demand side management techniques, especially when incorporating renewable energy sources and electric vehicle charging.
Innovation Solution
A demand side electric power supply management system with an islanded power system that maintains a constant mains frequency, allowing local generation and using a control signal to manage power transfer between the grid and the islanded system, prioritizing loads to maintain power flow at a set point, and enabling efficient use of renewable energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If grid frequency is allowed to vary to enable demand side management, then demand control capability is improved, but grid stability deteriorates
Solution Approach 1:
The patent divides the power system into an islanded microgrid segment and the main grid segment. The islanded system can operate independently with its own frequency control, while the main grid maintains stable frequency. This segmentation allows demand side management to be implemented locally without affecting overall grid stability.
Solution Approach 2:
The patent introduces an intermediary control system that manages power transfer between the islanded system and the main grid. This intermediary controller regulates the interface, ensuring that frequency variations in the islanded system do not propagate to the main grid, thus maintaining both demand control capability and grid stability.
2Productivity
If large-scale DDC implementation is pursued to achieve effective demand management, then demand side management effectiveness is improved, but investment cost increases
Solution Approach 1:
The patent implements demand side management at the local level within the islanded microgrid rather than requiring system-wide implementation. This allows effective demand management to be achieved in a localized area with reduced investment, while the same approach can be replicated elsewhere as needed.
Data Source
AI summary
A power supply system including a distribution transformer connected to a supply grid and supplying a plurality of remote electric loads over a supply network, measuring means for measuring total power transferred between the grid and loads through the transformer, and control signal generation means to signal some of the loads to switch off in response to determining that the measured power transfer exceeds a maximum set point in order to limit the peak power transferred through the transformer.