Microgrid System Relay Control for Power Stability
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Solution Overview
Problem
Standalone microgrids in isolated areas face challenges with power supply stability due to varying renewable energy generation and high communication loads when connected in a master-slave configuration, limiting the scalability and reliability of power transmission between multiple microgrids.
Innovation Solution
A microgrid system where multiple standalone microgrids with distributed structures are connected via relays, allowing controllers to communicate and determine power transmission based on capacity and power state, enabling efficient power reception and transmission between microgrids, with each microgrid operating in specific power modes (CVCF or constant output) and using energy storage systems to manage power variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a master-slave connection scheme is used to connect microgrids, then control and coordination between microgrids is achieved, but communication load increases and reliability decreases when many microgrids are connected
Solution Approach 1:
The system divides the microgrid network into multiple independent control zones, each managed by a local controller that can autonomously make connection decisions. This segmentation reduces the communication burden on any single master controller while maintaining coordinated operation across the entire network.
Solution Approach 2:
A distributed control mechanism acts as an intermediary between microgrids, enabling peer-to-peer communication and coordination without requiring all microgrids to communicate with a central master. This intermediary layer reduces overall communication load while maintaining system reliability.
2Adaptability or versatility
If standalone microgrids are built in isolated areas to avoid fuel transportation costs, then operational independence is achieved, but power supply stability decreases due to large variations in generated power
Solution Approach 1:
The patent combines multiple standalone microgrids into an interconnected network, allowing them to operate independently when needed while providing mutual support when connected. This merging enables isolated areas to maintain operational independence while benefiting from the stability of multiple power sources working together.
Solution Approach 2:
The system dynamically changes operational parameters such as connection states, power flow directions, and control modes based on real-time conditions. This allows microgrids to adapt between independent and interconnected operations, optimizing both autonomy and stability according to current needs.
3Productivity
If multiple standalone microgrids are connected in a distributed structure, then scalability is improved, but each microgrid may have no bypass line limiting connectivity
Solution Approach 1:
The patent implements dynamic connection capabilities where microgrids can change their connectivity status in real-time. Controllers can dynamically open or close connections between microgrids based on power state, capacity, and operational needs, providing both efficient power transmission and flexible adaptability.
Solution Approach 2:
A feedback mechanism monitors the power state and capacity of each microgrid, automatically adjusting connection states to optimize both transmission efficiency and connectivity flexibility. This feedback-driven approach ensures that microgrids maintain optimal operational parameters while adapting to changing conditions.
Data Source
AI summary
The present invention pertains to a microgrid system. A microgrid system according to an embodiment of the present invention is a microgrid system that is operated while separated from a power grid, wherein said microgrid system comprises: a first microgrid that includes a first load, a first ESS, a first distributed power system and a first controller; and a second microgrid that includes a second load, a second ESS, a second distributed power system and a second controller, and wherein a line connecting the first and the second microgrid is opened and closed using a relay, and the first and the second controller determine whether to open or close the relay by communicating with one another.