Alternating current and direct current power supply system with grounded power supply end
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF0 Cites 1 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more
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
Login to view more 
Login to view more