Control method for double PWM solid-state transformer

A technology of solid-state transformers and control methods, which is applied in the direction of control/regulation systems, instruments, and adjustment of electrical variables, etc., can solve problems such as unsatisfactory control effects and complex structure of solid-state transformers, and achieve elimination of adverse effects, improvement of adverse effects, and magnetic induction intensity high effect

Inactive Publication Date: 2015-10-21
TAIYUAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of complex structure and unsatisfactory control effect of the solid-state transformer in the prior art, the present invention provides a dual-PWM solid-state transformer with simple topology and flexible control and its control method

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  • Control method for double PWM solid-state transformer
  • Control method for double PWM solid-state transformer
  • Control method for double PWM solid-state transformer

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Embodiment Construction

[0031] The specific technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] A control method for a dual-PWM solid-state transformer is implemented, the control method is based on a dual-PWM solid-state transformer structure, and the control method for the dual-PWM solid-state transformer is realized. in:

[0033] A control method for a dual-PWM solid-state transformer is realized according to the following control links:

[0034] Step 1. The rectification stage control adopts the double closed-loop control method of the DC voltage outer ring network side current inner loop under the dq synchronous rotating coordinate system, such as figure 1 As shown, it specifically includes the following steps:

[0035] (1) Acquisition of rectification stage circuit network side voltage e a 、e b 、e c , the grid-side voltage phase θ is obtained by the software phase-locked loop of the single synchronou...

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Abstract

The invention discloses a control method for a double PWM solid-state transformer. The control method is implemented based on a double PWM solid-state transformer structure. For rectifier control, a double closed-loop control mode (direct-current voltage at outer loop and grid-side current at inner loop) is adopted under a dq synchronous rotating coordinate system to realize sinusoidal control on the grid-side current and make the unit power factor be 1; for direct-current transformation control, a double closed-loop control mode (output voltage at outer loop and inductive current at inner loop) is adopted to realize voltage level transformation, power transmission and electrical isolation; and for inverter control, a double closed-loop control mode (output voltage at outer loop and inductive current at inner loop) is adopted under the dq synchronous rotating coordinate system. Reliable high-quality power can be provided for users, and the bad influence of nonlinear load on the power grid can be improved effectively. The control method has higher load adaptability and dynamic response.

Description

technical field [0001] The invention relates to the application of power electronics technology in power systems, in particular to a control method for a double PWM solid-state transformer used in power electronics. Background technique [0002] Solid-state transformer, also known as power electronic transformer, is a new type of electrical equipment that combines modern power electronics technology and transformer technology applications. In addition to being able to realize the basic functions of traditional transformers such as electrical isolation, energy transmission, and voltage conversion, its outstanding feature is its high controllability, which can flexibly control the voltage amplitude and phase on both sides of the transformer, effectively improving the power quality of the grid, and Small size, light weight, less environmental pollution. With the continuous development of solid-state transformer technology, its application in power systems will continue to be p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M7/219H02M3/335H02M7/5387
Inventor 宋建成郑丽君高云广张晓伟
Owner TAIYUAN UNIV OF TECH
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