Microgrid Control With PV, Batteries, and Flywheel Backup
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Solution Overview
Problem
Traditional electric power distribution systems rely on central generation and transmission, lacking local power generation capabilities, which can lead to reliability issues and increased costs, especially during utility outages and peak demand times.
Innovation Solution
A microgrid system that includes photovoltaic panels, battery banks, flywheels, and a control system with a microgrid controller for managing power generation, storage, and distribution, allowing for local power generation and storage, and the ability to disconnect from the utility grid during outages to ensure continuous power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If local power generation is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The microgrid system is segmented into modular functional units: photovoltaic panels for generation, battery banks for storage, flywheels for stabilization, and distributed control systems. Each module operates semi-independently, allowing the system to maintain reliability while managing complexity through modular architecture.
Solution Approach 2:
The microgrid controller serves multiple functions simultaneously: it manages power generation from PV panels, controls battery charging/discharging, coordinates flywheel operation, and handles grid connection/disconnection. This multi-functionality reduces the need for separate dedicated devices, balancing reliability improvement with complexity management.
2Loss of energy
If renewable energy sources are used, then cost is reduced, but power generation capacity is limited
Solution Approach 1:
The system merges multiple energy sources and storage mechanisms: photovoltaic panels generate renewable energy, battery banks store excess energy for later use, and flywheels provide immediate power bursts. This combination allows the system to maintain low energy costs while achieving sufficient total power generation capacity through complementary technologies.
Solution Approach 2:
Battery banks are charged in advance during periods of high renewable generation or low demand, storing energy before peak consumption periods. This preliminary energy storage ensures that power generation capacity meets demand without requiring oversized renewable installations, maintaining cost-effectiveness while ensuring adequate capacity.
3Use of energy by moving object
If battery banks are charged to high state-of-charge, then energy availability is improved, but battery lifespan is reduced
Solution Approach 1:
The microgrid controller dynamically adjusts battery charge levels based on real-time system needs, grid conditions, and forecasted demand. Rather than maintaining a fixed high state-of-charge, the system optimizes charging thresholds dynamically, ensuring sufficient energy availability while minimizing unnecessary deep charging that would reduce battery lifespan.
Solution Approach 2:
The control system continuously monitors battery state-of-charge, temperature, and cycle history, using this feedback to adjust charging strategies. When batteries approach optimal charge levels, the system reduces or pauses charging to prevent overcharging damage, while still maintaining sufficient energy reserves for reliability, thus extending battery lifespan without sacrificing energy availability.
4Reliability
If microgrid disconnects from utility grid, then reliability is improved, but adaptability is reduced
Solution Approach 1:
The microgrid system dynamically transitions between connected and islanded modes based on grid conditions and local demand. The control system can quickly switch between operating states, maintaining reliability by disconnecting when necessary while preserving adaptability through the ability to reconnect and interact with the utility grid when conditions are favorable.
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 microgrid system enhances reliability by providing uninterrupted power during outages and reduces costs by utilizing renewable energy sources, while also optimizing energy usage and peak demand management through smart control algorithms.
Implementation Method 1
a plurality of photovoltaic (PV) panels. Each of the plurality of PV panels is connected to one of a plurality of PV panel inverters
Implementation Method 2
one or more battery banks, and a ground bank transformer configured to provide a ground current path. Each of the battery banks may include a plurality of battery cells
Implementation Method 3
supplying, with a flywheel, an amount of uninterrupted power to a critical load on the distribution loop for a period of time
Data Source
AI summary
Microgrids and methods for controlling a microgrid. In one example, a microgrid includes a microgrid controller, a primary junction, a high-voltage supply line, a high-voltage output line, one or more switchgear connecting the primary junction to at least one other component of the microgrid, a plurality of photovoltaic (PV) panels, a breaker connected to the plurality of PV panel inverters, a first load connected to the breaker, and one or more battery banks. In some instances, the microgrid includes a ground bank transformer configured to provide a ground current path. Each of the plurality of PV panels is connected to one of a plurality of PV panel inverters. Each of the battery banks may include a plurality of battery cells.