Microgrid Controller Managing Battery State-of-Energy
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Solution Overview
Problem
Microgrids are vulnerable to grid fluctuations such as over voltage, over frequency, and other instability conditions, which can cause extensive damage and blackouts due to the sensitivity of resources like generator sets, necessitating a more robust control system to maintain operational stability.
Innovation Solution
A microgrid system that includes energy generation systems, energy storage systems, and a controller to monitor and control the state-of-energy, adjusting power generation based on load demand and setting target charge and discharge values to maintain the energy storage system within desired levels, using a combination of photovoltaic and diesel generator sets to ensure stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If microgrids utilize generator sets to provide power, then power supply capability is improved, but sensitivity to grid fluctuations and instability increases causing damage and blackouts
Solution Approach 1:
An energy storage system is introduced as an intermediary component between the generator sets and the electrical load. The controller monitors state-of-energy and regulates charging/d discharging operations to buffer generator output fluctuations, preventing direct transmission of power instability to sensitive loads while maintaining continuous power supply capability.
Solution Approach 2:
The controller implements a feedback mechanism by continuously monitoring the state-of-energy of the energy storage system and adjusting the charging and discharging rates accordingly. The controller modifies generator set operation based on load demand and energy storage status, creating a closed-loop control system that maintains operational stability despite grid fluctuations.
2Speed
If energy storage system charges and discharges frequently to respond to power fluctuations, then response speed is improved, but battery life decreases
Solution Approach 1:
The system dynamically adjusts the state-of-energy thresholds for charging and discharging operations. The controller modifies target charge and discharge values based on current energy storage levels, creating adaptive response thresholds that balance rapid response capability with reduced unnecessary cycling. This dynamic threshold adjustment allows fast response to significant fluctuations while avoiding excessive charging/discharging cycles that would degrade battery life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system rapidly responds to power fluctuations, preventing damage by autonomously absorbing or providing power, thus enhancing the robustness and adaptability of microgrid systems, maintaining supply-demand equality and improving battery life through controlled charging and discharging.
Implementation Method 1
The EG system can be a photo-voltaic-based EG system
Data Source
AI summary
A system for controlling a battery state-of-energy within a microgrid includes an energy generation (EG) system, an electrical load coupled to the EG system, an energy storage system coupled to the EG system and the electrical load, and a controller coupled to the EG system and the energy storage system. The energy storage system can charge and discharge according to a target charge value and a target discharge value, which may be based on a state-of-energy of the energy storage system. The controller can control a power generation of the EG system based on the load demand and the target charge value and target discharge value of the energy storage system. The controller can further control a power generation of a second EG system when the EG system cannot meet the load demand and maintain the state-of-energy of the energy storage system within a desired level.