Space vector pulse width modulation controller of tri-level circuit and control method thereof

Abstract

The invention discloses a space vector pulse width modulation (PMW) controller of a tri-level circuit and a control method thereof. The controller comprises a searching module and a computation module, wherein, the searching module is used for searching the right triangle area in which the space vector corresponding to given value is located in a space vector plane figure according to the phase angle of the space vector corresponding to the given value, and takes switch vectors corresponding to each vertex of the right triangle area as constants to establish a composite vector mathematical model of the space vector of the given value and the work time of each switch; and the computation module is used for inputting acquired voltage and current input to the composite vector mathematical model, computing the work time of each switch in the circuit, and outputting the work time to an execution unit (EU). In the invention, the control algorithm of space vector PMW is simplified, and the programming cost and the hardware cost are reduced.

Description

technical field [0001] The invention relates to a space vector pulse width modulation (SVPWM) control method, in particular to a vector controller and a control method thereof. Background technique [0002] Generally, the topology of a three-phase three-level PFC (power factor correction) circuit is as follows figure 1 As shown, among them, a, b, c are three-phase AC voltage input, P, N are DC output, O point is the midpoint of output capacitor C01, C02; La, Lb, Lc are three inductors; S1, S2 , S3 is a number of power electronic devices (MOSFET, IGBT, etc.) and their additional circuits, which play the role of high-frequency switches and are called switching tubes; D1, D2, D3, D4, D5, and D6 are 6 diodes. figure 1 The circuit shown converts the three-phase AC voltage input from the terminals a, b, and c into the DC voltage output from the PN terminal through vector control, which is used to provide the DC bus voltage. [0003] figure 1 The different states of the three sw...

AI Technical Summary

Problems solved by technology

In these cases, the calculation formula of the switching vector action time derived from the above formula (II) is different, and the calculation is very complicated

[0017]In short, the calculation of the above vector control method is very complicated, which is not conducive to software programming, and generally requires a high-speed processor, which increases the design cost; if high-speed processor, the calculation time is too long, which limits the improvement of switching frequency

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