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Modular DC Transformer Based on Discrete Switched Capacitor and Its Modulation Method

A technology of DC transformers and switched capacitors is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., which can solve the problem of increasing the operating loss and cost of DC power grids, difficult to realize online input of redundant modules, and difficult to realize modulation. and control flexibility, to achieve the effect of non-stop cutting, flexible modulation and control strategy, and reduce manufacturing and design costs

Active Publication Date: 2020-09-08
SHENZHEN POWER SUPPLY BUREAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing technologies improve the voltage level and capacity of the DC transformer to meet the different DC voltage level connections between the high-voltage DC distribution network or the low-voltage DC micro-grid bus. It is difficult to achieve the flexibility of modulation and control, and it is difficult to achieve redundancy The online input of the remaining modules and the non-stop removal of the faulty modules have affected the overall reliability of the DC transformer; and the existing technology needs to configure more medium and high voltage DC circuit breakers in the external grid, thus improving the operation of the DC grid. loss and cost

Method used

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  • Modular DC Transformer Based on Discrete Switched Capacitor and Its Modulation Method
  • Modular DC Transformer Based on Discrete Switched Capacitor and Its Modulation Method
  • Modular DC Transformer Based on Discrete Switched Capacitor and Its Modulation Method

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Effect test

Embodiment 1

[0041] Example 1, such as figure 1 As shown, the discrete switched capacitor dual-active full-bridge sub-module DSC-DABi under this embodiment includes a discrete switched capacitor module DSCi and a dual-active full-bridge sub-module DABi; the discrete switched capacitor dual-active full-bridge sub-module DSC -DABi is connected in series to the medium (high) voltage DC bus through the discrete switched capacitor module DSCi, and the discrete switched capacitor dual-active full-bridge sub-module DSC-DABi is connected to the first connection terminal on the low-voltage DC side of the dual-active full-bridge sub-module DABi. The second link terminal on the low-voltage DC side is connected in parallel to the low-voltage DC bus; on the medium (high) voltage DC side, multiple discrete switched capacitor dual-active full-bridge sub-modules DSC-DAB are used in series to improve the withstand voltage level of the DC transformer. The low-voltage interface side adopts a parallel structu...

Embodiment 2

[0046] Embodiment 2, as another embodiment of the present invention, such as figure 2 As shown, the difference from Embodiment 1 is only that the switching tube of the output circuit H2i of the dual-active full-bridge sub-module DABi is removed, specifically:

[0047] The first leg of the output circuit H2i includes a diode D 21i composed of the first high-side arm, and the diode D 22i composed of the first lower bridge arm; the second bridge arm of the output circuit H2i includes a diode D 23i composed of the second upper arm, and the diode D 24i Composed of the second lower bridge arm, the diode D 23i The negative parallel switch capacitor C 2i , Diode D 24i The positive parallel switch capacitor C 2i , switched capacitor C 2i The positive pole of the discretized switch capacitor is connected to the first connection terminal of the dual active full-bridge sub-module DSC-DABi, and the switch capacitor C 2i The negative pole of the discrete switching capacitor is conn...

Embodiment 3

[0048] Embodiment 3, as another kind of embodiment of the present invention, such as image 3 As shown, the difference from Embodiment 1 is only that the switched capacitor C is replaced by the discrete switched capacitor module DSC 2i ; Cause the dual active full-bridge submodule DSC-DABi of the discrete switched capacitor to include two discrete switched capacitor modules DSCi (discrete switched capacitor module DSC1i, discrete switched capacitor module DSC 2i ) and a dual-active full-bridge sub-module DABi; the discrete switched-capacitor dual-active full-bridge sub-module DSC-DABi is connected in series to the medium (high) voltage DC bus through the discrete switched-capacitor module DSC1i, and the discrete switched-capacitor dual-active full-bridge The sub-module DSC-DABi passes through the discretized switched capacitor module DSC 2i The first connection terminal on the low-voltage DC side and the second connection terminal on the low-voltage DC side are connected in p...

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Abstract

The present invention relates to a modular DC transformer based on discrete switched capacitors, comprising one or more DSC-DAB sub-modules; the input ends of the multiple DSC-DAB sub-modules are connected in series or in parallel, and the output ends are connected in series or in parallel; the DSC-DAB sub-modules are connected in series or in parallel; The DAB sub-module includes a sequentially connected discrete switched capacitor module, a medium / high voltage DC conversion module, a high frequency isolation conversion module and a low voltage DC conversion module. The present invention adopts a modular design, which avoids the use of a large-capacity centralized high-frequency transformer, reduces the voltage change speed of the high-frequency link, avoids the overcurrent caused by the parasitic capacitance of the transformer, and simultaneously reduces the volume of the DC transformer and reduces the DC voltage. The production cost of the transformer is low, and it is convenient for installation, commissioning and transportation.

Description

technical field [0001] The invention belongs to the technical field of direct current transformers, in particular to a modular direct current transformer based on discrete switched capacitors and a basic modulation method thereof. Background technique [0002] In the DC power grid, due to the maturity of the fully-controlled voltage source converter (VSC) technology, the flexible DC transmission technology has developed rapidly, and has great application prospects in wind farm access, isolated load power supply, and asynchronous grid networking. . In particular, the development of multi-terminal flexible DC power transmission provides an effective technical approach for DC networking and encourages the extension of flexible DC technology to the power distribution side. [0003] In order to realize the connection of high and medium voltage DC distribution busbars of DC distribution network with low voltage DC microgrid busbars or loads of different DC voltage levels, energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02H7/12
CPCH02H7/1213H02M3/3353H02M1/0058Y02B70/10
Inventor 孙谦浩赵彪孙杰宋强余占清曾嵘刘国伟赵宇明艾精文
Owner SHENZHEN POWER SUPPLY BUREAU
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