Separately-excited starting and self-excited power supply cascaded submodule power system

A power supply system and sub-module technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of high partial discharge and withstand voltage requirements of voltage transformers, large capacity of external excitation constant current source, high cost, etc., to achieve drive Small power requirements, guaranteed safety and reliability, and reduced power

CN108063540APending Publication Date: 2018-05-22TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-05-22

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    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
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Abstract

The invention discloses a power system for providing cascaded submodules with electricity. The power system comprises N submodule control power supplies, wherein each submodule control power supply corresponds to one submodule and provides the corresponding submodule with the electricity; and each submodule control power supply comprises a first power module PS1, a second power module PS2, a firstdiode VD1 and a second diode VD2. Through the power system, the cost of the system is reduced and the security and the reliability of the system are ensured.
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Description

technical field

[0001] The invention belongs to the field of electrical automation equipment, in particular to a cascaded sub-module power supply system for self-excitation starting and power supply with separate excitation. Background technique

[0002] In the prior art, electrical equipment such as chain-link converters and modular multilevel converters generally have a topology circuit structure including multiple cascaded sub-modules, which are applied to medium and high voltage frequency converters and medium and high voltage dynamic voltage restorers. Such as medium and high voltage power electronic converters or static synchronous compensators, medium and high voltage inverters and light direct current transmission devices.

[0003] like figure 1 The chain-link converter shown is formed by connecting the AC outputs of multiple power sub-modules in series. The power supply system adopted by this chain-link converter has the following problems:

[0004] a) The power ...

Examples

Embodiment Construction

[0037] The specific embodiments of the present invention will be further described in conjunction with the technical solutions of the present invention and the accompanying drawings.

[0038] The self-excited self-excited power supply system of cascaded sub-modules of the present invention, such as image 3 As shown, it includes N sub-modules to control the power supply, where N≥2. Each sub-module controls the power supply, such as Figure 4 As shown, it includes power module PS1, power module PS2, diode VD1 and diode VD2. Among them, the input terminal of the power module PS1 is connected to the secondary side of the current transformer CT1, and the primary side of CT1 is connected to the output terminal of the external excitation constant current source PS0. Multiple sub-module control power sources can be connected in series to share an external excitation constant current source. The positive pole of the output terminal DC1 of the power supply module PS1 leads to the pos...