Voltage-equalizing and power-equalizing control method for multi-module cascade solid-state transformer

A technology of solid-state transformers and control methods, applied in control/regulation systems, output power conversion devices, reactive power adjustment/elimination/compensation, etc., can solve problems such as voltage and power imbalance, and achieve low voltage stress on switching tubes , the control algorithm is simple, and the effect of accelerated development

Inactive Publication Date: 2012-08-15
ZHEJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-module cascaded solid-state transformer voltage equalization and power control method for the shortage of voltage and power imbalance existing in the existing cascaded modules

Method used

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  • Voltage-equalizing and power-equalizing control method for multi-module cascade solid-state transformer
  • Voltage-equalizing and power-equalizing control method for multi-module cascade solid-state transformer
  • Voltage-equalizing and power-equalizing control method for multi-module cascade solid-state transformer

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Embodiment Construction

[0023] The SST power main circuit part of the multi-module cascaded solid-state transformer equalizing power control method of the present invention is composed of three stages: the input stage is a high-frequency active AC / DC rectifier, and the intermediate stage is a high-frequency isolated DC / DC converter , the output stage is a high-frequency DC / AC inverter. In order to meet the requirements of high voltage and high power level, the AC side of the input stage adopts multi-module series connection, the high-voltage DC output terminal of each module of the input stage is connected to the input terminal of each module of the intermediate stage, and the output terminals of each module of the intermediate stage are connected in parallel to output 400V DC. The output stage high-frequency inverter transforms 400V DC into output 220V / 50Hz AC. Power can flow in both directions.

[0024] The multi-module cascaded solid-state transformer voltage equalization and power equalization c...

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Abstract

The invention discloses a voltage-equalizing and power-equalizing control method for a multi-module cascade solid-state transformer (SST). An SST power main circuit part applied in the method comprises an input stage, an intermediate stage and an output stage, wherein a common duty ratio control policy based on single-phase d-q vector control is adopted in the input stage so as to realize the unit power factor of an input end of an electric network; a control policy based on voltage feedforward and voltage feedback is introduced for each module in the intermediate stage, the voltage feedforward is used as a reference of the voltage feedback, and an error between the voltage feedforward and the voltage feedback is used as a reference of inner current loop of the module after being output by a voltage PI adjuster. The two control policies of the front stage and the intermediate stage interact so as to realize the functions of voltage and power equalization of each SST module, electricalnetwork side unit power factor, high electrical network current sine degree, low switching tube voltage stress and the like.

Description

technical field [0001] The invention relates to the application of power electronics technology in power systems, in particular to a multi-module cascaded SST (solid-state transformer) voltage equalization and power control method. Background technique [0002] Since the traditional power transformer was invented, it has become an indispensable and important part of the power system because of its reliable operation and simple structure, and has a huge number of applications. But it has significant disadvantages: bulky, heavy; the output voltage cannot be kept constant; its main function is to achieve isolation and voltage level conversion, the function is simple, and it has no ability to improve the power quality of the grid. [0003] The concept of solid-state transformer has long been proposed, and it mainly realizes voltage conversion and energy transfer by using power electronic devices and power electronic technology. Its outstanding feature is that it can improve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M3/335H02J3/18
CPCY02E40/30
Inventor 石健将苟伟
Owner ZHEJIANG UNIV
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