Capacitor harmonic resonance overvoltage detection method and protection device

The invention discloses a capacitor harmonic resonance overvoltage detection method and protection device. The capacitor harmonic resonance overvoltage detection method and protection device adopt advanced hardware equipment, are combined with a harmonic resonance analysis algorithm, and reliably protect a capacitor. The protection device mainly comprises a master control circuit board, a harmonic collection and conditioning circuit, a voltage following circuit, a multi-path conversion switch circuit, an AD conversion module, an FPGA control module, a 485 communication circuit, a 232 communication circuit, and a man-machine interaction module circuit board. The capacitor harmonic resonance overvoltage detection method mainly comprises the steps of analog acquisition and analog acquisition control and transmission with an algorithm module, an algorithm module and power grid remote control communication module, an algorithm module and man-machine interaction module, and a database module. The capacitor harmonic