Modern electronic systems cannot function without three-phase inverters, which transform DC power into three-phase AC power with adjustable amplitude, frequency, and phase difference. They are essential in several applications, including as power distribution networks, renewable energy systems, and industrial motor drives.
The output stage of the three-phase inverter primarily comprised a dual closed-loop control system utilizing the SVPWM modulation algorithm, an NPC three-level inverter circuit, an LC filter circuit, and a three-phase load module. Based on the SVPWM algorithm, the maximum amplitude of the three-phase voltage output was Udc2 /3 ½.
The working principles of the high-frequency isolated NPC three-level inverter frequency conversion and speed regulation system topology are as follows: The three-phase industrial AC input is converted into a DC power source via a three-phase diode rectifier.
The three-phase industrial AC input is converted into a DC power source via a three-phase diode rectifier. The DC voltage Udc1 is transmitted to the intermediate stage, where it is converted into a stable DC voltage Udc2 by the high-frequency isolated DC-DC stage, and then sent to the output stage with the NPC three-level inverter.
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Common-mode rejection ratio (CMRR): The switching frequency of typical three-phase industrial inverter goes up to 16 to 20 kHz. The CMRR greater than 80 dB at 100 kHz …
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