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Direct-current solid-state transformer with bipolar output voltage self-balancing capability

A technology of solid-state transformer and output voltage, which is applied in the direction of output power conversion device, adjustment of electric variable, high-efficiency power electronic conversion, etc. It can solve the problems of increasing system cost and achieve the effect of cost saving

Inactive Publication Date: 2020-06-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a DC solid-state transformer with bipolar output voltage self-balancing capability to solve the problem that in the existing bipolar DC output scheme, it is necessary to use additional switching devices to construct bipolar from the existing DC bus DC output, the problem of increasing the cost of the system

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  • Direct-current solid-state transformer with bipolar output voltage self-balancing capability

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specific Embodiment approach 1

[0020] Specific implementation mode one: as figure 1 As shown, this embodiment discloses a DC solid-state transformer with bipolar output voltage self-balancing capability, including a high-voltage DC bus, a high-voltage side DC bus capacitor, a high-voltage side circuit, a resonant cavity, a low-voltage side circuit, and a low-voltage side split DC bus. A capacitor, a load and a low-voltage DC bus, the high-voltage side circuit includes a first bridge arm and a second bridge arm, and the low-voltage side circuit includes a third bridge arm, a fourth bridge arm, and a balance inductor L 1 and balanced inductance L 2 ;

[0021] The high-voltage side DC bus capacitor, the first bridge arm and the second bridge arm are connected in parallel between the positive pole and the negative pole of the high-voltage DC bus bar, and the low-voltage side splits the DC bus capacitor, load, third bridge arm and fourth bridge arm The bridge arms are all connected in parallel between the posi...

specific Embodiment approach

[0034] Taking a 1kV / ±375V DC solid-state transformer with bipolar output voltage self-balancing capability as an example to further illustrate the specific implementation of the present invention: the DC input voltage on the high voltage side is 1kV, and the bipolar output voltage on the low voltage side is ±375V. The pole rated output is 75kW each. As preferred, with load R 1 open circuit, load R 2 It is equal to 1.875 ohms to design this case, at this time, it flows through the balance inductance L 1 with balanced inductance L 2 The inductor current is 100A. Preferably, the inductor current ripple is ±20%, the switching frequency is 10kHz, and the resulting balanced inductance L is designed 1 with balanced inductance L 2 The value is about 88.5μH. Get the simulated waveform as image 3 As shown, the current on the inductor changes between 80 and 120A, and the voltage of the two split capacitors remains balanced. At this time, the simulation waveforms of the output vol...

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Abstract

The invention discloses a direct-current solid-state transformer with bipolar output voltage self-balancing capability, and belongs to the field of power electronic technology and direct-current powertransmission and distribution. A high-voltage side direct-current bus capacitor, a first bridge arm and a second bridge arm are connected in parallel between the anode and cathode of a high-voltage direct-current bus; a low-voltage side split direct-current bus capacitor, a load, a third bridge arm and a fourth bridge arm are connected in parallel between the anode and cathode of a low-voltage direct-current bus; a high-voltage side circuit is provided with an output end; a low-voltage side circuit is provided with an input end; a resonant cavity is provided with a high-voltage side and a low-voltage side; the output end is connected with the high-voltage side; the input end is connected with the low-voltage side; one end of a balance inductor L1 is connected with an input end g; one endof a balance inductor L2 is connected with an input end f; and the other end of the balance inductor L1 is connected with the other end of the balance inductor L2 and connected with the low-voltage side split direct-current bus capacitor. The topology of the invention directly outputs bipolar direct-current voltage; bipolar direct-current output can be realized without constructing a voltage balancer by an additional switching device, so that cost is saved.

Description

technical field [0001] The invention relates to a DC solid-state transformer with bipolar output voltage self-balancing capability, which belongs to the field of power electronics technology and DC power transmission and distribution. Background technique [0002] DC power transmission and distribution technology has attracted more and more attention from the academic and industrial circles due to its advantages such as no need for reactive power compensation devices, easy access to loads and new energy sources, high efficiency and energy saving. Among them, the bipolar DC power distribution method has attracted much attention due to its characteristics of different DC voltage levels that facilitate the access of loads with different voltage levels. [0003] At present, there are many studies on unipolar DC output solid-state transformers, such as Chinese patent CN106026665A, Chinese patent CN107546844A, Chinese patent CN107592017A, etc. In order to meet the needs of DC bipo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J1/00
CPCH02J1/00H02M3/33592Y02B70/10
Inventor 李彬彬毛舒凯赵晓东付勤天张丙旭徐殿国
Owner HARBIN INST OF TECH
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