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Alternating current and direct current power supply system with grounded power supply end

A power supply system, AC and DC technology, applied in the direction of a single AC network with different frequencies, can solve the problems of power supply, power supply terminal can not be grounded, three-phase four-wire or three-phase five-wire can not be used, etc., to solve the common mode voltage oversized effect

Pending Publication Date: 2019-09-03
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art that the existing system cannot provide three-phase four-wire or three-phase five-wire power supply, and the power supply end cannot be grounded, the present invention provides an AC / DC power supply system whose power supply end can be grounded

Method used

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  • Alternating current and direct current power supply system with grounded power supply end
  • Alternating current and direct current power supply system with grounded power supply end
  • Alternating current and direct current power supply system with grounded power supply end

Examples

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Embodiment 1

[0069] This embodiment provides an AC / DC power supply system in which the power supply terminal can be grounded, such as figure 1 As shown, it usually consists of a power electronic transformer device, an inverter DC / AC device and a DC / DC device.

[0070] The power electronic transformer device in the figure usually consists of a high-voltage AC unit, a high-voltage DC unit, a high-frequency transformer isolation unit, a low-voltage DC unit, and a high-voltage AC reactor L ac , HVDC smoothing reactor L dc and other components; the power electronic transformer passes through the reactor L ac , The AC switch QF1 is connected to the high-voltage AC power supply, and through the smoothing reactor L dc 1. The DC switch QS1 is connected to the high-voltage DC power supply; the low-voltage DC unit is connected to the low-voltage DC bus. The power electronic transformer is responsible for the transformation of the voltage level and the transformation of the AC and DC forms of the v...

Embodiment 2

[0077] This embodiment provides an AC / DC power supply system in which the power supply end can be grounded, and the system includes:

[0078] Power electronic transformers, low-voltage DC buses, low-voltage inverter DC / AC devices and non-isolated DC / DC devices;

[0079] The input end of the power electronic transformer is connected to the medium and high voltage grid, and the output end is connected to the low-voltage DC bus;

[0080] The input end of the low-voltage inverter DC / AC device is connected to the low-voltage DC bus, and the output end is connected to a low-voltage AC load and grounded;

[0081] The input terminals of multiple non-isolated DC / DC devices are connected in parallel to the low-voltage DC bus, and the output terminals are respectively connected to low-voltage DC loads.

[0082] The low-voltage inverter DC / AC device includes:

[0083] DC side DC support capacitor, power semiconductor switch and LC filter;

[0084] The DC side DC support capacitor and t...

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Abstract

The invention relates to an alternating current and direct current power supply system with a grounded power supply end. In the scheme, the input end of a power electronic transformer is connected with a medium-high voltage power grid, and the output end of the power electronic transformer is connected with a low-voltage direct current bus; the input end of a low-voltage inverter DC / AC device is connected with the low-voltage direct-current bus, and the output end of the low-voltage inverter DC / AC device is connected with a low-voltage alternating-current load and grounded; and the input endsof non-isolated DC / DC devices are connected to the low-voltage direct-current bus in parallel, and the output ends of the non-isolated DC / DC devices are connected with a low-voltage direct-current load. According to the scheme, a three-phase four-wire or three-phase five-wire power supply mode is established at the alternating current and direct current power supply side, and the problem that a grounding wire system is lacked when a three-phase three-wire inverter supplies power is solved. In addition, a star connection capacitor is additionally arranged on the output side of the low-voltage inverter DC / AC device and is connected with the input sides of the non-isolated DC / DC devices to construct a low-impedance loop of a common-mode voltage, so that the common-mode voltage of the alternating current side to the direct current side can be effectively inhibited, and the problem that the power supply process is interfered due to overlarge common-mode voltage of the non-isolated alternating current / direct current power supply circuit is solved.

Description

technical field [0001] The invention relates to the technical field of AC and DC power supply and use, in particular to an AC and DC power supply system whose power supply end can be grounded. Background technique [0002] The AC-DC power supply system is the core part of the upcoming AC-DC distribution network in the future. It is responsible for the important role of power conversion (including voltage level conversion, frequency conversion, AC-DC power supply mode conversion, etc.) and power supply. Its core technology is power Electronic equipment technology. In actual application design, in order to increase the power density of equipment, reduce the manufacturing cost of equipment or in consideration of other design factors, usually the low-voltage AC side of equipment usually uses high-power three-phase three-wire non-isolated inverters to supply power to low-voltage AC loads , The low-voltage DC side of the equipment mostly uses high-power non-isolated DC / DC (DC / DC)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02
CPCH02J3/02
Inventor 邓占锋慕小斌赵国亮陈国富李卫国王翔刘海军徐云飞才志远贾晓光周哲刘宗烨
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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