A multi-stage soft charging control method and system for a multi-level DC solid-state transformer

A technology of solid-state transformer and control method, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, and adjustment of electric variables, etc., to achieve the effects of increasing service life, easy implementation, and simple structure

Active Publication Date: 2021-09-07
HEFEI KEWELL POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is how to reduce the current peaks of the AC side and the DC side when the modularized multilevel DC solid-state transformer starts

Method used

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  • A multi-stage soft charging control method and system for a multi-level DC solid-state transformer
  • A multi-stage soft charging control method and system for a multi-level DC solid-state transformer
  • A multi-stage soft charging control method and system for a multi-level DC solid-state transformer

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Embodiment 1

[0062] like figure 1 As shown, a multi-stage soft charging control method for a multi-level DC solid-state transformer, the modular multi-level DC solid-state transformer includes an input source V dc1 , the output source V dc2 , primary side MMC, secondary side MMC, current limiting resistor R d , the current limiting switch S d , the high-frequency transformer T; the leakage inductance of the high-frequency transformer T is L s ; The primary side MMC includes a plurality of sub-modules SM to form an H-bridge circuit; the secondary side MMC includes a plurality of sub-modules SM to form an H-bridge circuit; the primary side MMC and the secondary side MMC pass high frequency Transformer T is connected; the current limiting resistor R d with current limiting switch S d After parallel connection, one end is connected to the primary side MMC, and the other end is connected to the input source V dc1 connection; the input source V dc1 is a DC source; the input source V dc1 ...

Embodiment 2

[0104] like figure 1 As shown, a multi-stage soft charging control system for a multi-level DC solid-state transformer, the modular multi-level DC solid-state transformer includes an input source V dc1 , the output source V dc2 , primary side MMC, secondary side MMC, current limiting resistor R d , the current limiting switch S d , the high-frequency transformer T; the leakage inductance of the high-frequency transformer T is L s ; The primary side MMC includes a plurality of sub-modules SM to form an H-bridge circuit; the secondary side MMC includes a plurality of sub-modules SM to form an H-bridge circuit; the primary side MMC and the secondary side MMC pass high frequency Transformer T is connected; the current limiting resistor R d with current limiting switch S d After parallel connection, one end is connected to the primary side MMC, and the other end is connected to the input source V dc1 connection; the input source V dc1 is a DC source; the input source V dc1 ...

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Abstract

A multi-stage soft charge control method and system for a multi-level DC solid-state transformer, which relates to the field of power electronics technology, and solves the problem of how to reduce the current peaks of the AC side and the DC side when the modular multi-level DC solid-state transformer is started; the described The multi-stage soft charging control method includes: uncontrolled charging of the sub-module of the primary side MMC; using peak current to control the soft charging of the sub-module of the primary side MMC; using phase-shift modulation to control the soft charging of the sub-module of the secondary side MMC; the control System, including input source, output source, primary side MMC, secondary side MMC, current limiting resistor R d , the current limit switch S d , high-frequency transformer; realizes the fast and stable charging of the sub-module capacitor of the modular multi-level DC solid-state transformer, reduces the current peak of the AC side and the DC side when the transformer is started, and protects the power devices and high voltage in the sub-module The frequency transformer increases the service life of the capacitor and is beneficial to the safe operation of the system.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a multi-stage soft charging control method and system for a multi-level DC solid state transformer. Background technique [0002] In order to protect the environment and respond to the concept of sustainable development of the country, the use of new energy in daily life is increasing, and how to solve the problem of power transmission after new energy is generated is very important. Traditional transformers have disadvantages such as large weight and volume, harmonic pollution, and relatively difficult maintenance, which are no longer suitable for power transmission of new energy sources. [0003] In addition to realizing the functions of transformation, isolation and energy conversion of traditional transformers, the modular multilevel converter (MMC) also has the advantages of simple control, high scalability, and isolation of primary and secondary side f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/33569
Inventor 唐德平
Owner HEFEI KEWELL POWER SYST CO LTD
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