A Self-Powered Double U-Finger MME Resonator Capable of Wirelessly Capturing Abnormal Message in Smart Grid Networks

Area of Science:

• Materials Science
• Electrical Engineering
• Energy Harvesting

Background:

• Magneto-mechano-electric (MME) coupling is crucial for energy harvesting and operational monitoring in power grids and the Power Internet of Things (PIoT).
• Existing systems often require separate components for energy harvesting and sensing, limiting efficiency and integration.

Purpose of the Study:

• To develop and demonstrate a single MME resonator capable of simultaneously harvesting magnetic energy and sensing power line faults.
• To enable wireless, self-powered, and self-sensing functionalities for PIoT applications.

Main Methods:

• Designed an MME resonator with two crossed piezoelectric U-fingers of different lengths and magnet masses, operating in dual bending modes.
• One U-finger (50 Hz) functions as an energy harvester (EH), while the other (185 Hz) acts as a sensor.
• Utilized a 185 Hz injected current to enable fault detection alongside 50 Hz magnetic energy harvesting.

Main Results:

• The EH U-finger achieved an output power of 1.53 mW RMS under a 0.5 Oe magnetic field, with high normalized power density.
• The sensing U-finger demonstrated high sensitivity (710 pT detectability) to a 185 Hz magnetic field, even during EH operation.
• Application tests confirmed wireless monitoring and synchronous self-powered operation, providing energy for data processing and transmission.

Conclusions:

• The presented MME resonator efficiently harvests magnetic energy and detects power line faults wirelessly and simultaneously.
• This technology offers a self-powered, self-sensing solution for advancing the Power Internet of Things.