Regulation of D.C. voltage of a pulse-width modulated rectifier using spatial vectors in a stationary coodinate system
First Claim
1. A method for regulating the d.c. voltage of a pulse-width modulated rectifier bridge controlled by self-commuting semiconductor components and provided with filtering coils, comprising the steps of:
- (a) measuring the phase voltages of the supplying three-phase mains and the d.c. voltage of the rectifier;
(b) determining a spatial vector of the mains voltages, spatial vectors formed from them and components of such vectors;
(c) selecting a coordinate system tied to the spatial vector of the mains voltages; and
(d) producing modulation references for the pulse-width modulation using pure sine and cosine curves, synchronized with the mains voltages, with spatial vectors formed from them or with components of such vectors, by means of at least one phase locked loop.
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Abstract
Procedure for regulating the d.c. voltage of a pulse-width modulated rectifier bridge controlled by self-commutated semiconductor components and provided with filtering coils, in which procedure the phase voltages of the supplying three-phase mains and the d.c. voltage of the rectifier are measured. The modulation references needed for the pulse-width modulation are produced using pure sine and cosine curves synchronized with the mains voltages, with spatial vectors formed from them or with components of such vectors, by means of a phase-locked loop. The regulation is effected in a coordinate system tied to the spatial vector of the mains voltages.
25 Citations
11 Claims
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1. A method for regulating the d.c. voltage of a pulse-width modulated rectifier bridge controlled by self-commuting semiconductor components and provided with filtering coils, comprising the steps of:
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(a) measuring the phase voltages of the supplying three-phase mains and the d.c. voltage of the rectifier; (b) determining a spatial vector of the mains voltages, spatial vectors formed from them and components of such vectors; (c) selecting a coordinate system tied to the spatial vector of the mains voltages; and (d) producing modulation references for the pulse-width modulation using pure sine and cosine curves, synchronized with the mains voltages, with spatial vectors formed from them or with components of such vectors, by means of at least one phase locked loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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