Neutral point clamped (NPC) inverter control system

Details Neutral point clamped (NPC) inverter control system Neutral point clamped (NPC) inverter control system

1996-12-12

1998-08-04

Nappi, Robert

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 58, 363 41, 363 65, 363 98, H02H 7122

Patent

active

057903964

ABSTRACT:
A neutral point clamped (NPC) inverter control system including a DC power source to output DC voltage having a neutral point, an NPC inverter to convert the DC voltage into AC voltage in three phases through a PWM control, a mode selecting unit to decide a first and a second PWM modes by comparing amplitude of voltage reference with a prescribed value that is defined by a minimum pulse width, a first voltage reference conversion means to add a prescribed bias value at which a polarity changes to positive
egative within a fixed period to secure the minimum pulse width to voltage references in respective phases in a first PWM mode, a second voltage reference conversion means to fix the voltage reference in one phase by a value that secures the minimum pulse width when voltage reference in one phase is smaller than a prescribed value that is defined by the minimum pulse width in a second PWM mode and correct voltage references of other two phases so as to make line voltage to a value corresponding to the voltage reference, and a modulation frequency change-over means to lower PWM control modulation frequency in the first PWM mode and to suppress power loss caused by switching in the first PWM mode.

REFERENCES:
patent: 5274542 (1993-12-01), Tanaka et al.
patent: 5361197 (1994-11-01), Miyazaki et al.
patent: 5502633 (1996-03-01), Miyazaki et al.
patent: 5514944 (1996-05-01), Miyazaki
patent: 5621628 (1997-04-01), Miyazaki et al.

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