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A Multilevel Hysteresis Control Method Based on Error Variation

A technology of hysteresis control and error change, applied in the control field of multi-level inverters, can solve the problems of difficult expansion, high switching frequency and large error, etc.

Inactive Publication Date: 2019-01-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The error is large, the switching frequency is high, and it is not easy to expand to a higher level

Method used

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  • A Multilevel Hysteresis Control Method Based on Error Variation
  • A Multilevel Hysteresis Control Method Based on Error Variation
  • A Multilevel Hysteresis Control Method Based on Error Variation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A three-level hysteresis control method based on error variation, comprising the following steps:

[0027] 1) The current moment is T i , the multilevel inverter is at a distance from T i The moment when the most recent level jump occurs is t j , i=1, 2, ..., j = 1, 2, ...;

[0028] record the multilevel inverter at t j The error between the reference voltage and the measured voltage before the time jump

[0029] record the multilevel inverter at t j The output level u after time jump tj ;

[0030] 2) Obtain the current time T of the three-level inverter i The error between the reference voltage and the measured voltage ε Ti ;

[0031] 3) Calculation of error variation Δε Ti , and set the threshold h:

[0032]

[0033] 4) If Δε T = 0, the output voltage of the multilevel inverter does not jump; let u tj+1 = u tj , jump to step 1) to T i+1 to update T i , with t j+1 to update t j , with u tj+1 to update u tj ; if Δε T =+h, the output voltage of ...

Embodiment 2

[0045] This embodiment extends the three-level hysteresis control method in Embodiment 1 to 2N+1 levels (N=1, 2...). The definition and switching logic of the hysteresis control strategy of 2N+1 level are still the same as those of the three-level hysteresis control.

[0046] The setting method of the hysteresis comparator is the same as figure 2 Similarly, since the 2N+1 level hysteresis control strategy adds 2N-2 levels, 2N-2 hysteresis comparators need to be added. The addition of the hysteresis comparator at the figure 2 Arranged symmetrically on the basis of , and the hysteresis width is h.

[0047] Take the five-level inverter as an example: Compared with the three-level hysteresis control, the five-level hysteresis control adds +2 and -2 level states, that is, two hysteresis comparators are added, such as image 3 shown. Assume that the last time the inverter jumps to 0, and the output level u=0 after the jump, Δε T =0, then if Δε T increases from 0, and at time...

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Abstract

The invention discloses a multi-level hysteresis control method based on error variation, which takes the error variation between a reference voltage and a measurement voltage as the control object, introduces positive and negative thresholds, and uses a hysteresis comparator to determine the switching action time, and according to The change trend of the error variation and the output level before the switching action select the output level after the action. Based on the traditional three-level hysteresis control, the method reduces the error, lowers the switching frequency, is simple in design, and is easy to expand to multi-level.

Description

technical field [0001] The present invention relates to the control of multilevel inverters. Background technique [0002] In high-power applications, multi-level inverters are becoming the mainstream choice to provide good high voltage and high current. Compared with the two-level inverter, the stress of the multi-level inverter is small, which effectively improves the power level. At the same time, under the same switching frequency, the harmonic distortion rate is reduced and the output waveform quality is improved. At present, there are methods such as carrier modulation, space vector control, predictive control, and hysteresis control to complete the control of multi-level inverters. The frequency of the first three methods is fixed, but the carrier modulation requires multiple linear controllers, the space vector modulation algorithm is complex, and the predictive control has a large amount of calculation. Although the frequency is not fixed, hysteresis control is wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487H02M1/08
CPCH02M1/08H02M7/487H02M1/0003
Inventor 侯世英颜文森孙韬陈剑飞谢之光冯斌杨祝涛余海威廖磊郭志诚李琦赵丹钟雯苗德根
Owner CHONGQING UNIV
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