Three-phase Vienna rectifier carrier discontinuous pulse width modulation

Abstract

The invention discloses carrier discontinuous pulse width modulation of two types of three-phase Vienna rectifiers. The carrier discontinuous pulse width modulation comprises a zero-crossing clamping type and a peak value clamping type, wherein the clamping area of zero-crossing clamping type carrier discontinuous pulse width modulation is located near an input current zero-crossing point and a peak point so as to improve input current zero-crossing distortion, and the clamping area of the peak value clamping type carrier discontinuous pulse width modulation is located in the input current maximum phase so as to reduce switching loss to the maximum degree and achieve the highest efficiency. According to the invention, the zero-sequence components needing to be injected for the two types of modulation are achieved through one expression; and compared with other discontinuous pulse width modulation, the implementation is simple, the modulation program execution time is shortened, the calculation burden of a digital controller is relieved, and the carrier discontinuous pulse width modulation is suitable for a wide-forbidden-band device and a high-switching-frequency AC / DC converter.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a control method for a three-phase Vienna rectifier. Background technique [0002] The circuit structure of the three-phase Vienna rectifier is simple, the number of switching devices is small, there is no through problem, and it has the advantages of high power density and high reliability, so it is widely used in the field of aviation and electric vehicles. For converters based on wide bandgap devices such as silicon carbide and gallium nitride, in order to achieve higher power density, the switching frequency is often several times that of traditional silicon device converters, and the control cycle is correspondingly shortened. At the same time, in the application of aviation primary power supply, it is often desired that the converter has a higher switching frequency. On the one hand, high switching frequency can reduce the volume and weight ...

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Problems solved by technology

The prior art document "LeeJ, Lee K. Carrier-based discontinuous PWM method for Vienna rectifiers [J], IEEE Transactions on Power Electronics, 2015, 30(6): 2896-2900." proposes a discontinuous carrier modulation, which will The zero-phase is clamped to the midpoint of the DC side, which solves the problem of different phases of the voltage and current of the Vienna rectifier, increases the judgment conditions, and makes the algorithm more complicated

Prior art literature "Lee J, Lee K. Performance analysis of carrier-based discontinuous PWM method for Vienna rectifiers with neutral-pointvoltage balance [J]. IEEE Transactions on Power Electronics, 2016, 31(6): 4075-4084." It is proposed that additional zero-sequence components can be further injected to achieve different discontinuous pulse width modulations, but the judgment steps are cumbersome and the calculations are complicated

Literature "Li K, Wei M, Xie C, et al. Triangle Carrier-Based DPWM for Three-Level NPC Inverter[J], IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018, 6(4): 1966-1978." The clamping mode of discontinuous PWM is controlled by adding variable coefficients in the zero-sequence component, but the value of the variable coefficients needs to be judged by the sector, and the calculation process is cumbersome, which is not conducive to digital implementation

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