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Three-phase two-switch rectifier filter inductor and hysteresis control switching frequency design method

A technology of filtering inductance and switching frequency, which is applied in the field of design of filtering inductance and hysteresis loop control switching frequency of three-phase two-switch rectifier converter, which can solve the problems of uncontrollable switching frequency and damage of switching devices, and facilitate system loss analysis , Improve the degree of sinusoidalization, drive circuit design and the effect of reliability improvement

Active Publication Date: 2020-12-18
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Current hysteresis comparison control is usually used in systems that want to obtain good current control, but the actual switching frequency may not be easily controlled when hysteresis control is used. Due to the influence of hysteresis width, too high switching frequency may cause damage to switching devices

Method used

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  • Three-phase two-switch rectifier filter inductor and hysteresis control switching frequency design method
  • Three-phase two-switch rectifier filter inductor and hysteresis control switching frequency design method
  • Three-phase two-switch rectifier filter inductor and hysteresis control switching frequency design method

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Embodiment 1

[0027] The present invention comprises the following steps:

[0028] (1) According to the inductor current i of each phase on the converter side 12 i 22 and i 32 (Theoretical steady state i 12 i 22 and i 32 In addition to the phase difference of 120°, it has approximately the same waveform) to present a critical continuous state under the required load, according to Calculate the inductance value of the converter side of each phase (the inductance L of the three converter sides 12 , L 22 and L 32 have the same value L). In addition, T s for the desired switching period, V o is the rated voltage of the DC side, V cm is the AC side capacitance (C 1 、C 2 and C 3 ) peak voltage, I m Inductance L of each phase on the converter side 12 , L 22 and L 32 The peak value of the fundamental component of the current.

[0029] (2) According to Calculate the inductor current i for 12 i 22 and i 32 The delay of the filtered low-pass filter (these three currents will b...

Embodiment 2

[0037] combine Figure 1 to Figure 3 , the design method of the present invention is realized like this:

[0038] (1) According to the inductor current i of each phase on the converter side 12 i 22 and i 32 (Theoretical steady state i 12 i 22 and i 32 In addition to the phase difference of 120°, it has approximately the same waveform) to present the requirement of critical continuous state under the required load. At the unit power factor, the corresponding inductor current when the voltage phase is 90°:

[0039]

[0040] In the formula, I m is the peak value of the average value of the phase current.

[0041] The loop current equation in an inductor is:

[0042]

[0043] In the formula, V cm is the peak voltage of the capacitor on the AC input side.

[0044] The peak value of the average value of the phase current is:

[0045]

[0046] according to figure 1 , the DC side can be regarded as two Boost converters in series, and the voltages of the two DC cap...

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Abstract

The invention discloses a three-phase two-switch rectifier filter inductor and hysteresis control switching frequency design method, which comprises the steps of 1, each phase of inductive current ona converter side is in a critical continuous state under a required load, and an inductance value L of each phase of inductance on the converter side is calculated. 2, the time delay Td of a low-passfilter for inductive current filtering is calculated; 3, if the time delay of the signal of which the frequency fs is equal to 1 / Ts passing through the second-order low-pass filter is Td, the corresponding phase delay meets the condition that the natural resonance angular frequency omega n of the second-order low-pass filter is calculated when the phase delay of the signal of which the angular frequency omega s is obtained according to the second-order low-pass filter; and 4, under the condition of filtering delay, the switching frequency fs of the actual converter adopts the natural resonanceangular frequency fn of the low-pass filter. According to the invention, the harmonic distortion of the grid-side current can be reduced, and the sine degree of the grid-side current can be improved;and an engineering design method for switching frequency design under current hysteresis control is provided.

Description

technical field [0001] The invention relates to a three-phase two-switch rectifier converter side filter inductance and a hysteresis loop control switching frequency design method, which belongs to the technical field of power electronics. Background technique [0002] Current hysteresis comparison control is usually used in systems that want to obtain good current control, but the actual switching frequency may not be easily controlled when using hysteresis control. Due to the influence of hysteresis width, too high switching frequency may cause damage to switching devices. The invention provides a three-phase two-switch rectifier filter inductance and a hysteresis control switching frequency design method. The three-phase two-switch rectifier has a good power factor correction function under the premise that the inductor current on the converter side needs to be intermittent or approximately in a critical continuous state (as the continuity of the inductor current on the c...

Claims

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Application Information

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IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 张镠钟彭辉王芳瑞游江
Owner HARBIN ENG UNIV
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