Distribution network high-frequency isolated type flexible direct-current converter
A high-frequency isolation and flexible DC technology, applied in the direction of output power conversion devices, reversible conversion equipment, electrical components, etc., can solve the problems of single power conversion form, few applications in the distribution network field, poor interface matching, etc. , to achieve the effect of shortening engineering design and processing cycle, facilitating system maintenance and redundant design, and low cost
Active Publication Date: 2018-06-15
TBEA SUNOASIS
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Problems solved by technology
However, the traditional flexible direct transmission and distribution technology requires power frequency transformers to complete the functions of step-up and down, electrical isolation, etc., which is costly, occupies a large area, has a single form of power conversion, and poor interface matching, so it is rarely used in the field of distribution networks.
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[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0048] Such as figure 1 , figure 2 and image 3 As shown, the present invention consists of 3n figure 1 and image 3 or 6n figure 2 It is composed of four high-frequency isolated basic power units 1, and n is a positive integer greater than or equal to 2. These high-frequency isolated basic power units 1 are connected to each other to form a distribution network-level flexible DC system. The whole system has a DC input terminal, which can be connected to a high-voltage DC grid, etc.; a three-phase AC output terminal, which can be connected to a high-voltage AC grid, etc.
[0049] Such as Figure 4 As shown, the high-frequency isolated basic power unit 1 includes a non-isolated DC / DC converter 11, an isolated DC / DC converter 12 and a non-isolated DC / AC converter 13 connected in sequence; the non-isolated The input terminal of ...
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The invention relates to a distribution network high-frequency isolated type flexible direct-current converter. 3n or 6n high-frequency isolated type basic power units are connected with one another so as to form the distribution network high-frequency isolated type flexible direct-current converter; the high-frequency isolated type basic power unit includes a non-isolated type DC/DC converter, anisolated type DC/DC converter and a non-isolated DC/AC converter which are sequentially connected with one another; the input end of the non-isolated type DC/DC converter is adopted as the direct current input end of the high-frequency isolated type basic power unit; the output end of the non-isolated DC/DC converter is connected with the input end of the isolated type DC/DC converter; the outputend of the isolated type DC/DC converter is connected with the input end of the non-isolated type DC/AC converter; and the output end of the non-isolated type DC/AC converter is adopted as the alternating current output end of the high-frequency isolated type basic power unit. With the distribution network high-frequency isolated type flexible direct-current converter of the present invention adopted, functions such as the bi-directional transmission, electrical isolation, and waveform control of medium-voltage direct-current electric energy and medium-voltage alternating-current electric energy can be realized; and modular series and parallel design is adopted, and therefore, expansion can be facilitated, and the requirements of medium-voltage and small- and medium-capacity electric energy conversion can be satisfied.
Description
technical field [0001] The invention belongs to the technical field of distribution network-level flexible DC power transmission and distribution, and relates to a distribution network-level high-frequency isolated flexible DC converter. Background technique [0002] Flexible DC power transmission and distribution technology is a relatively new type of DC power transmission and distribution technology, and it is an important equipment for building a smart grid. Compared with traditional methods, flexible DC transmission and distribution has strong technical advantages in island power supply, urban distribution network capacity expansion, AC system interconnection, and large-scale wind farm grid connection. Strategic Choice. [0003] Voltage Source Converter High-Voltage Direct Current (VSC-HVDC, Voltage Source Converter High-Voltage Direct Current) technology based on Voltage Source Converter (VSC, Voltage Source Converter) and Pulse Width Modulation (PWM, PulseWidth Modula...
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IPC IPC(8): H02M7/72
CPCH02M7/72H02M1/0067H02M1/0074H02M1/0077
Inventor 黄浪徐鹏李直侯丹郝翔
Owner TBEA SUNOASIS
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