High frequency link decoupling equivalent model of cascaded H-Bridge type power electronic transformer

An equivalent model, power electronics technology, applied in the field of effective model, can solve the problem of low efficiency of CHB-PET simulation

Pending Publication Date: 2021-07-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of low CHB-PET simulation efficiency, the present invention proposes a decoupling equivalent model of cascaded H-bridge power electronic transformer high-frequency chain port

Method used

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  • High frequency link decoupling equivalent model of cascaded H-Bridge type power electronic transformer

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Embodiment Construction

[0016] The invention provides a decoupling equivalent model of the high-frequency chain port of a cascaded H-bridge power electronic transformer. The modeling steps of the present invention will be further described in detail below.

[0017] step 1:

[0018] Transform the magnetic coupling of the transformer into a circuit connection, the transformation ratio is N, the transformer that ignores the copper loss and iron loss and does not consider the saturation characteristics of the iron core is as follows: figure 2 (a) shown. Using the trapezoidal integral method to deal with the differential equation of the voltage and current at the transformer port can get:

[0019]

[0020] Among them, L 1 , L 2 Respectively represent the leakage inductance of the primary and secondary sides of the transformer, L m Indicates the magnetizing inductance of the transformer. Then use the trapezoidal integration method to discretize, and get formula (2):

[0021]

[0022] Among th...

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Abstract

The invention relates to a high frequency link decoupling equivalent model of a cascaded H-Bridge type power electronic transformer, and mainly aims at establishing an equivalent model of a cascaded H-bridge type power electronic transformer (CHB-PET). According to the core technical scheme of the invention, 1, Ward equivalence is utilized to transfer external contribution inside a power module to a boundary node; 2, the voltage at the current moment is replaced with a historical voltage value according to the characteristic that the capacitor voltage of the high-frequency link port between adjacent simulation step lengths does not suddenly change; 3, after circuit decoupling is achieved, Ward equivalence is carried out again to eliminate remaining nodes, and a back-to-back equivalent circuit of the power module is obtained; and 4, a phase unit equivalent circuit is formed according to connection characteristics of CHB-PET, an external circuit is accessed and solved by an EMT solver, and internal parameters are inversely solved and updated.

Description

technical field [0001] The invention relates to a decoupling equivalent model of a high-frequency chain port of a cascaded H-bridge power electronic transformer, which belongs to the technical field of power system simulation. Background technique [0002] Power electronic transformers (Power Electronic Transformers, PET) are a new type of power electronic equipment, which is characterized in that each power module contains a high-frequency transformer and a large number of power electronic switching devices. PET can realize functions such as AC and DC voltage conversion, electrical isolation, power transmission, and large-scale distributed new energy grid connection, and has gradually become a key device in AC and DC distribution networks. However, the CHB-PET detailed model based on discrete components has a large number of nodes, and the simulation efficiency is extremely low. It faces severe challenges in electromagnetic transient simulation. [0003] Aiming at the prob...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02M5/10H02M5/293G06F30/20
CPCH02M5/10H02M5/293G06F30/20
Inventor许建中冯谟可孙昱昊赵成勇
OwnerNORTH CHINA ELECTRIC POWER UNIV (BAODING)