Micro-grid Autonomous Control via Battery Frequency Adjustment
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Solution Overview
Problem
Stand-alone micro-grids using renewable energy sources face challenges in long-term power supply adjustment due to battery capacity limitations and require expensive communication infrastructure and operational systems for autonomous control, making them inefficient and costly.
Innovation Solution
A system where the battery system adjusts its output frequency based on charge levels, autonomously controlling power generators and loads to synchronize operations, reducing the need for external communication infrastructure and operational systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an EMS (Energy Management System) is implemented for autonomous control of stand-alone micro-grid, then power supply adjustment capability is improved, but system complexity and cost increase due to required communication infrastructure and operational systems
Solution Approach 1:
The patent extracts the essential autonomous control function from the complex EMS system. Instead of implementing a full EMS with communication infrastructure, the invention isolates and implements only the necessary frequency-based control mechanism that enables autonomous operation without requiring elaborate communication networks or centralized operational systems.
Solution Approach 2:
The stand-alone micro-grid system performs autonomous control through self-service mechanisms. Each component (power generators, battery, loads) autonomously responds to frequency changes without requiring external communication or centralized control, enabling the system to manage its own power supply adjustment independently.
2Extent of automation
If communication infrastructure and operational systems are implemented for autonomous control, then control functionality is improved, but initial investment cost increases
Solution Approach 1:
The patent replaces expensive, long-term communication infrastructure with a simple, inexpensive frequency-based control mechanism. The frequency signal serves as a universal communication medium that already exists in the power system, eliminating the need for separate communication networks and reducing initial investment costs significantly.
3Quantity of substance
If battery charge amount continuously increases due to sufficient renewable energy, then energy storage capacity is improved, but battery becomes fully charged and cannot store remaining energy
Solution Approach 1:
The patent implements a feedback mechanism where the battery's charge state is continuously monitored through frequency measurements. When the battery reaches full charge, the system detects this condition and automatically adjusts power generation accordingly, preventing overcharge and ensuring reliable ongoing energy storage capability.
4Adaptability or versatility
If battery charge amount decreases due to insufficient renewable energy, then power supply flexibility is improved, but battery cannot provide sufficient power and diesel generator must be operated
Solution Approach 1:
The patent implements dynamic power supply adjustment where the system continuously adapts to changing conditions. The frequency-based control mechanism dynamically balances renewable energy input, battery charge/discharge operations, and diesel generator activation, maintaining power supply reliability while maximizing flexibility in response to varying renewable energy availability.
Data Source
AI summary
Disclosed in a stand-alone micro-grid autonomous control system including: at least one battery system directly changing a reference frequency thereof according to a charge amount, and providing power having the changed reference frequency; at least one power generator measuring the reference frequency from the power provided form the at least one battery system, and starting generating power or stopping generating power based on the measured reference frequency; and at least one load measuring the reference frequency from the power provided from the battery system, and performing a synchronization operation or a synchronization releasing operation based on the measured reference frequency.