Multi-stage soft charging control method and system for multi-level direct-current solid-state transformer

A technology of solid-state transformers and control methods, applied in control/regulation systems, converting DC power input to DC power output, adjusting electrical variables, etc., to achieve the effects of safe operation, stable charging, and reduced current peaks

Active Publication Date: 2020-07-03
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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  • Multi-stage soft charging control method and system for multi-level direct-current solid-state transformer
  • Multi-stage soft charging control method and system for multi-level direct-current solid-state transformer
  • Multi-stage soft charging control method and system for multi-level direct-current solid-state transformer

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Embodiment 1

[0062] Such as figure 1 As shown, a multi-stage soft charge 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 limit switch S d , 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 The transformer T is connected; the current limiting resistor R d with current limit 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 Suppl...

Embodiment 2

[0104] Such as figure 1 As shown, a multi-level DC solid-state transformer multi-stage soft charge control system, 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 limit switch S d , 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 The transformer T is connected; the current limiting resistor R d with current limit 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 Supply powe...

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Abstract

The invention discloses a multi-stage soft charging control method and system for a multi-level direct-current solid-state transformer, relates to the technical field of power electronics, and solvesthe problem of how to reduce current spikes of an alternating-current side and a direct-current side when a modular multi-level direct-current solid-state transformer is started. The multi-stage softcharging control method comprises the following steps: sub-modules of a primary side MMC are charged in an uncontrolled manner; peak current is used for controlling soft charging of sub-modules of theprimary side MMC; c soft charging of sub-modules of the secondary side MMC is controlled by using phase shift modulation; the control system comprises an input source, an output source, a primary side MMC, a secondary side MMC, a current-limiting resistor Rd, a current-limiting switch Sd and a high-frequency transformer. The modular multilevel direct-current solid-state transformer sub-module capacitor charging circuit realizes quick and stable charging of a modular multilevel direct-current solid-state transformer sub-module capacitor, reduces current spikes of an alternating-current side and a direct-current side when a transformer is started, protects a power device and a high-frequency transformer in a sub-module, prolongs the service life of the capacitor, and powerfully facilitatessafe operation of a 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 proportion of new energy used in daily life is increasing. How to solve the problem of power transmission after new energy power generation is very critical. Traditional transformers have disadvantages such as large weight and volume, harmonic pollution, and relatively difficult maintenance, which are no longer suitable for power transmission problems of new energy sources. [0003] Modular multilevel DC solid-state transformer (MMC for short) not only realizes the transformation, isolation and energy conversion functions of traditional transformers, but also has the advantages of simple control, high scalability, and isol...

Claims

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Application Information

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Patent Type & Authority Applications(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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