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LC filter design for high-power PWM voltage source inverter

Yuanhua Chen

Open publisher page 7 citations

Abstract

For medium voltage drives based on pulse width modulation (PWM) voltage source inverters, the LC filter design is difficult due to the LC resonance. A new optimal LC filter design method was developed based on a threelevel neutral point clamped (NPC) inverter and selected harmonic eliminated PWM. The excitation of the resonance is actively damped throughout the whole operating frequency range for low switching frequencies. The effects of the LC filter on the motor voltage and inverter output current were analyzed. A parameter design method was developed for the inductor and capacitor designs. The proposed method was confirmed by experimental results on a 6 kV NPCVSI based medium voltage drive.

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What this paper is about

For medium voltage drives based on pulse width modulation (PWM) voltage source inverters, the LC filter design is difficult due to the LC resonance. A new optimal LC filter design method was developed based on a threelevel neutral point clamped (NPC) inverter and selected harmonic eliminated PWM. The excitation of the resonance is actively damped throughout the whole operating frequency range for low switching frequencies. The effects of the LC filter on the motor voltage and inverter output current were analyzed. A parameter design method was developed for the inductor and capacitor designs. The proposed method was confirmed by experimental results on a 6 kV NPCVSI based medium voltage drive.

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Available abstract

For medium voltage drives based on pulse width modulation (PWM) voltage source inverters, the LC filter design is difficult due to the LC resonance. A new optimal LC filter design method was developed based on a threelevel neutral point clamped (NPC) inverter and selected harmonic eliminated PWM. The excitation of the resonance is actively damped throughout the whole operating frequency range for low switching frequencies. The effects of the LC filter on the motor voltage and inverter output current were analyzed. A parameter design method was developed for the inductor and capacitor designs. The proposed method was confirmed by experimental results on a 6 kV NPCVSI based medium voltage drive.

Key concepts: Pulse-width modulation, LC circuit, Inverter, Voltage, Inductor, Control theory (sociology), Harmonic, Voltage source

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