A staggered parallel control method of svpwm modulation

Abstract

The invention discloses a space vector pulse width modulation (SVPWM) interleaving system and an interleaving control method thereof. The interleaving system comprises a first power module and a second power module, wherein the first power module and the second power module both employ two-level three-phase fully-controlled bridge topological structures. The interleaving control method comprises a starting procedure and an interrupt procedure, wherein the starting procedure comprises energizing the interleaving system, initializing a register, setting a continuous increase and decrease mode of a timer, judging a power module of executing the procedure, inquiring whether the power modules are standard and synchronous or not and enabling the timer to be interrupted, and the interrupt procedure comprises calculating and inputting a modulation wave, performing three seconds coordinate conversion, judging a sector, calculating action time of adjacent vectors and comparing corresponding loading of the register. The interleaving system and the interleaving control method have the advantages that an interleaving idea is transplanted to an SVPWM algorithm, the DC voltage utilization ratio of the interleaving system is improved, and the output waveform quality of the interleaving system is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, in particular to an interleaved parallel control method of SVPWM modulation. Background technique [0002] Low-voltage static var generator (SVG, Static Var Generator) and active power filter (APF, Active Power Filter) often adopt modular design in many low-voltage and high-power applications, using power modules with the same or different capacity specifications Parallel connection constitutes high-power system operation, and the modular design can quickly enrich the product series, which is convenient for later maintenance and replacement of products. Compared with SPWM modulation, SVPWM modulation technology has better DC voltage utilization and is convenient for digital realization. At present, there are usually two control schemes for modular parallel systems: one is centralized control, that is, multiple power modules use the same controller. This solution leads to a very...

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Problems solved by technology

[0004] Traditional interleaved modulation usually adopts SPWM modulation. During modulation, the carrier phase of the two power modules is shifted by 180 degrees. Although it can also make the output PWM modulation of the two power modules have a mutual difference of 180 degrees, SPWM has the disadvantage of low DC voltage utilization.

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