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Dead zone pre-compensation method for TNPC bidirectional converter of alternating current-direct current hybrid micro-grid

A bidirectional converter, AC-DC hybrid technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as unsatisfactory accuracy, compensation lag, etc. Compensation of dead time, high precision effect

Inactive Publication Date: 2017-08-01
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] In order to overcome the deficiencies such as compensation lag and unsatisfactory accuracy caused by the existing dead zone compensation technology in the system, the present invention provides a dead zone pre-determined method for a three-level TNPC bidirectional converter applied to an AC / DC hybrid microgrid. The compensation method realizes accurate voltage vector compensation, and adaptively adjusts the compensation depth, which is convenient for calculation and programming, and achieves the purpose of eliminating crossover distortion, improving waveform quality, and suppressing input current harmonics of AC-DC hybrid microgrid

Method used

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  • Dead zone pre-compensation method for TNPC bidirectional converter of alternating current-direct current hybrid micro-grid
  • Dead zone pre-compensation method for TNPC bidirectional converter of alternating current-direct current hybrid micro-grid
  • Dead zone pre-compensation method for TNPC bidirectional converter of alternating current-direct current hybrid micro-grid

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Experimental program
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Effect test

Embodiment 1

[0071] step 1), Figure 6 The U, V, and W axes represent three-phase windings with a difference of 120° in space. The α-β coordinate system is a two-phase stationary rectangular coordinate system fixed on the stator. The axis of the U-phase winding can be selected as the α axis. The d-q coordinate system is a two-phase synchronously rotating Cartesian coordinate system, and the synthetic vector U of the three-phase voltage * The direction of is taken as the d-axis direction, and the γ angle is the rotation angle of the space voltage synthesis vector. I * is the composite vector of the three-phase current in the rotating coordinate system, and U * The phase difference is δ angle.

[0072] According to the coordinate transformation, the transformation formula from the three-phase coordinate system to the space-stationary α-β coordinate system is:

[0073]

[0074] The transformation formula from the α-β coordinate system to the d-q coordinate system rotating at a synchron...

Embodiment 2

[0108] In Example 1, if the direction of the three-phase current changes, a feasible implementation step is:

[0109] Step 1~step 3 are the same as embodiment one;

[0110] Step 4, if the direction of the three-phase current is i A >0,i B >0,i C <0,

[0111]

[0112] If the direction of the three-phase current is i A >0, i B C >0,

[0113]

[0114] If the direction of the three-phase current is i A B >0, i C >0,

[0115]

[0116] If the direction of the three-phase current is i A B >0, i C <0,

[0117]

[0118] If the direction of the three-phase current is i A B C >0,

[0119]

[0120] Steps 5 to 7 are the same as in Example 1.

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Abstract

The invention discloses a dead zone pre-compensation method for the TNPC bidirectional converter of an alternating current-direct current hybrid micro-grid. Real-time judgment of a current vector based on a two-phase synchronous rotation d-Q rectangular coordinate system is used. In different three-level space vector regions, the given instruction reference space voltage vector is decomposed to determine the equation of the dead zone pre-compensation correction space voltage vector. A dead zone compensation factor is used to adaptively adjust the compensation depth to realize dead zone compensation of a power switching device in the converter. The method is characterized in that the method is realized by programming; the compensation depth is adaptively adjusted; the algorithm is easily realized through calculation and programming, which helps to quickly and easily realize accurate dead zone compensation; crossover distortion is eliminated; the waveform quality is improved; and the input current harmonics of the alternating current-direct current hybrid micro-grid are suppressed.

Description

technical field [0001] The invention relates to a PWM control method for a three-level TNPC bidirectional converter of an AC-DC hybrid micro-grid, and realizes pre-compensation for the dead zone of the converter, so as to improve the waveform quality of the inverter and restrain the AC-DC hybrid micro-grid. Input current harmonics. Background technique [0002] The TNPC bidirectional converter can be used to connect between the AC and DC buses of the AC-DC hybrid microgrid, work in rectification or inverter mode, realize the bidirectional flow of energy between the AC and DC buses, and be AC ​​and DC when running off-grid The hybrid microgrid system provides stable voltage and frequency support to maintain the stable operation of the microgrid system and the reasonable distribution of power on both sides of the AC and DC. The existence of the dead zone in the converter will inevitably reduce the output voltage capability, the voltage waveform will also be distorted, and the...

Claims

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Application Information

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IPC IPC(8): H02M7/487H02M1/38
CPCH02M1/38H02M7/487H02M1/385
Inventor 周熙炜汪贵平赵祥模林海陈金平
Owner CHANGAN UNIV
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