Unipolar-bipolar convertible direct-current converter
A DC converter, bipolar technology, applied in the direction of DC network circuit devices, conversion equipment with intermediate conversion to AC, electrical components, etc., can solve problems affecting the efficiency of DC power distribution systems, achieve high power density, circuit Effect of compact structure and small number of switching elements
Active Publication Date: 2014-12-17
STATE GRID CORP OF CHINA +3
View PDF3 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, the research on the bipolar system structure is mostly focused on the design of the topology of the voltage equalizer. In the above scheme, the voltage equalizer is specially designed for the abnormal state of the system. Work in light load state, affect the efficiency of DC power distribution system
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0043] figure 1 The structure diagram of the DC converter in the bipolar DC distribution network architecture is shown, and the structure diagram of a single-bipolar conversion DC converter is shown in image 3 Shown; There is following defect in described unipolar conversion DC converter:
[0044] ①: figure 1In the structure shown, in order to ensure the voltage balance capability, a voltage balancer DC Voltage Balancer needs to be added, resulting in a bloated and complicated system structure;
[0045] ②: The single-bipolar ...
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 provides a unipolar-bipolar convertible direct-current converter comprising a unipolar side power module and a bipolar side power module connected to two sides of a medium-frequency transformer. The unipolar side power module comprises a first power electronic device full-bridge circuit, a voltage stabilizing capacitor and a direct-current breaker; two ends of the power electronic device full-bridge circuit are connected with the medium-frequency transformer; other two ends of the power electronic device full-bridge circuit are connected with a unipolar direct-current system; the bipolar side power module comprises a second power electronic device full-bridge circuit, a capacitor, a voltage stabilizing capacitor, a reactor and a direct-current breaker; two ends of the second power electronic device full-bridge circuit are connected with the medium-frequency transformer, and other two ends of the second power electronic device full-bridge circuit are connected with a bipolar direct-current system. Compared with the prior art, the unipolar-bipolar convertible direct-current converter has the advantages that the circuit structure is compact, fewer switching devices are required, soft switching can be achieved, and system loss is decreased; the unipolar direct-current system and the bipolar direct-current system can be electrically isolated by adjusting windings of the medium-frequency transformer; the converter is also applicable to high transformation ratio applications.
Description
technical field [0001] The invention relates to a bipolar DC converter, in particular to a bipolar DC converter without a voltage equalizer. Background technique [0002] The hub DC power distribution of the DC power supply system combines the DC output from AC rectification, the DC generated by new energy power generation, and the DC output from the energy storage unit into an uninterrupted DC output bus, which is then tapped to supply power for loads of various capacities. The circuit is connected to the corresponding fuse or load switch to supply power to the load. [0003] Compared with the traditional AC distribution network, the DC distribution network has the following advantages: [0004] ①: Reduce the AC link in the power conversion, reduce the number of system components, and reduce the loss of the converter; there is no eddy current loss and reactive power, reducing line loss; [0005] ②: Easy to connect distributed power supply and load; [0006] ③: Improve po...
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
Login to View More IPC IPC(8): H02M3/28H02J1/00
Inventor 姚良忠杨波许晓慧陶以彬曹远志李官军蔡旭朱淼张建文马建军丁杰卢俊峰李琰崔红芬王德顺周晨刘欢鄢盛驰王志冰孙蔚胡金杭冯鑫振吴婧朱红保李跃龙
Owner STATE GRID CORP OF CHINA