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Rapid transient calculation method and system for asymmetric 18-pulse phase-shifting self-coupling transformer rectifier

A technology of autotransformer and autotransformer, which is applied in the field of rapid transient modeling of aviation high-performance multi-pulse rectifier converters, can solve the problems of rapidity limitation and reduction of simulation accuracy, and achieve comparable accuracy and accuracy High, fast computing effect

Pending Publication Date: 2022-02-25
XIAN UNIV OF TECH
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Problems solved by technology

As two existing fast transient modeling methods for multi-pulse rectifiers, the state-space averaging method and the rectifier bridge / transformer model method assume that the 18-pulse phase-shifted autotransformer works in an ideal state, and only consider the fundamental switch of the rectifier bridge function, which reduces the simulation accuracy
At the same time, the application of Park transformation makes the rapidity of these two methods limited to the three-phase balanced system
It can be seen that there is currently no fast simulation method specifically for asymmetric 18-pulse phase-shifted autotransformer rectifiers, which has both calculation accuracy and speed, and is suitable for three-phase balanced and three-phase unbalanced systems

Method used

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  • Rapid transient calculation method and system for asymmetric 18-pulse phase-shifting self-coupling transformer rectifier
  • Rapid transient calculation method and system for asymmetric 18-pulse phase-shifting self-coupling transformer rectifier
  • Rapid transient calculation method and system for asymmetric 18-pulse phase-shifting self-coupling transformer rectifier

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Embodiment

[0097] suppose figure 1 In the system, the effective value of the voltage on the three-phase grid side is 115V, and the frequency is 400Hz, and the voltage of phase A becomes 0V at the moment of 1s (simulating the unbalanced state of the three phases). Asymmetrical 18-pulse phase-shifted autotransformer primary winding turns N p =39; The number of turns of the secondary winding is N s1 = 29 and N s2 =15; the DC side load is a resistive load R=16Ω.

[0098] step 1:

[0099] The expression of the relationship between the output terminal voltage of the winding and the AC voltage of the grid side is:

[0100]

[0101] The relational expression between the current at the winding output terminal and the AC current at the grid side is:

[0102]

[0103] Step 2:

[0104] The mathematical model of the switching function corresponding to the three groups of three-phase rectifier bridges (only A phase is given) is:

[0105]

[0106] Step 3:

[0107] The relationship betw...

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Abstract

The invention discloses a rapid simulation transient calculation method and system for an asymmetric 18-pulse phase-shifting self-coupling transformer rectifier. The method specifically comprises the following steps of 1, deducing a relational expression between a winding output end voltage and a grid-side alternating current voltage and a relational expression between a winding output end current and a grid-side alternating current, 2, establishing a mathematical model of a corresponding switching function, 3, establishing a relational expression between the winding output end alternating current voltage and the rectified direct current voltage and a relational expression between the winding output end current and the rectified direct current, and 4, based on a time-frequency transformation theory, restoring the dynamic phasors of the direct current side voltage and the grid side alternating current into a time-domain waveform capable of visually reflecting the transient characteristics of the rectifier by using time-frequency transformation. The problems that an existing rapid simulation method does not have calculation accuracy and rapidity at the same time and is difficult to be suitable for a three-phase balanced system and a three-phase unbalanced system at the same time are solved.

Description

technical field [0001] The invention belongs to the technical field of fast transient modeling of aviation high-performance multi-pulse rectifier converters, and in particular relates to a fast transient calculation method and system for an asymmetrical 18-pulse phase-shifting autotransformer rectifier. Background technique [0002] The multi-pulse rectifier composed of a phase-shifting transformer and a power electronic module diode rectifier bridge is widely used in the high-voltage DC power supply system of multi-electric aircraft to realize the conversion from three-phase AC voltage to 270V DC bus voltage. Among many types of phase-shifting transformers, the 18-pulse phase-shifting autotransformer has the outstanding advantages of small size, light weight and high transmission efficiency. Therefore, the 18-pulse phase-shifting autotransformer rectifier is most commonly used in the high-voltage DC power supply system of multi-electric aircraft. [0003] The statistical d...

Claims

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Application Information

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IPC IPC(8): G06F30/20H02M7/08
CPCG06F30/20H02M7/08
Inventor 原东昇尹忠刚张延庆张彦平罗培恩
Owner XIAN UNIV OF TECH
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