Carrier-based three-level converter square wave modulation method

A carrier-based three-level converter square wave modulation method comprises the steps of online calculating the four operation angles [theta]1, [theta]2, [theta]3, and [theta]4 of an A-phase power device during the square wave modulation according to the amplitude of a three-phase sine wave, and p...

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Bibliographische Detailangaben
Hauptverfasser:	LI YAOHUA, GAO ZHAN, GE QIONGXUAN, ZHAO LU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	A carrier-based three-level converter square wave modulation method comprises the steps of online calculating the four operation angles [theta]1, [theta]2, [theta]3, and [theta]4 of an A-phase power device during the square wave modulation according to the amplitude of a three-phase sine wave, and performing minimum pulse width constraint on the four operation angles of the A-phase power device; detecting the phase angle of the sine wave and comparing the phase angle with the four operation angles [theta]1, [theta]2, [theta]3, [theta]4 of the A-phase power device to obtain a three-phase modulating wave; comparing the three-phase modulating wave with an in-phase stacked triangular carrier to obtain the PWM signals of the respective power devices. The method of the invention can realize thesquare wave modulation of a three-level converter based on a carrier wave, makes the three-phase phase voltage satisfy three-phase symmetry, half-wave symmetry and quarter-cycle symmetry when enteringa square wave, overcomes