Smart Microgrid Controller for Hybrid Islanded Power Systems
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Solution Overview
Problem
Existing microgrid distribution systems face challenges in operating effectively in isolated grid architectures, particularly with load sharing, power quality, and synchronization when combining renewable energy sources with diesel generators, leading to inefficiencies and high costs.
Innovation Solution
A smart microgrid system with a controller that monitors power sources and loads, prioritizes energy distribution, and switches between grid-tied and isolated modes, using a communication network and switchable connections to manage power buses and interfaces, ensuring flexible and adaptable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If renewable energy resources are combined with diesel generators in hybrid islanded microgrids, then energy sustainability is improved, but system complexity and operational inefficiency worsen due to load sharing and synchronization challenges
Solution Approach 1:
The system segments the microgrid into multiple independent yet coordinated units, each with its own controller that can operate autonomously or in coordination with others. This segmentation allows renewable resources and diesel generators to be managed as separate controllable entities rather than a monolithic complex system, reducing operational complexity while maintaining sustainability
Solution Approach 2:
A communication network acts as an intermediary between power sources, loads, and controllers, enabling coordinated operation without direct complex electrical interfacing. The communication layer mediates power sharing decisions, synchronization requirements, and load distribution, simplifying the overall system architecture while achieving sustainable hybrid operation
2Reliability
If microgrids operate in isolated grid mode with multiple paralleled resources, then energy independence is improved, but power quality and synchronization difficulty worsen
Solution Approach 1:
Controllers continuously monitor power output, frequency, and voltage from each paralleled resource and adjust operation in real-time based on feedback signals. This closed-loop control ensures automatic synchronization and maintains power quality without requiring complex manual coordination, enabling reliable isolated grid operation with multiple resources
Solution Approach 2:
The system design allows each power resource to serve multiple functions - renewable sources provide both base load and synchronization reference, while diesel generators can operate in parallel or as backup. This multi-functional capability enables seamless coordination and simplifies synchronization requirements while maintaining energy independence
3Productivity
If diesel generators operate at partial load to support renewable energy integration, then renewable energy utilization is improved, but operational efficiency and cost worsen
Solution Approach 1:
The system dynamically adjusts diesel generator operation based on real-time renewable energy availability and load requirements. Controllers continuously optimize the operating point of diesel generators, allowing them to operate at optimal efficiency levels when renewables are insufficient while maximizing renewable utilization, rather than running at fixed partial load conditions
Data Source
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AI summary
Described herein are embodiments of microgrid systems which may be used as stand-alone systems or may be connected to a larger, integrate power supply system. In one embodiment, a smart microgrid system includes at least one electrical power bus connectable to at least one input power source by one or more switchable connections, a communication network coupled to the smart microgrid system, and a controller coupled to the communication network, wherein the controller comprises logic to monitor power outputs from the at least one input power source, monitor one or more power loads coupled to the at least one electrical power bus, and regulate the power drawn from one or more of the input power sources to the at least one electrical power bus.