DC transformer based on centralized multi-winding high-frequency transformer, and control method
A technology of DC transformers and high-frequency transformers, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the difficulty of further improving the power density of DC transformers, and the increase in the number of switching devices and high-frequency transformers, etc. question
Active Publication Date: 2019-08-23
SOUTHEAST UNIV
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Furthermore, the number of switching devices and high-frequency transformers is also greatly increased, which makes it difficult to further increase the power density of DC transformers
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[0027] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation examples.
[0028] The invention designs a DC transformer based on a centralized multi-winding high-frequency transformer. Such as figure 1 As shown, the DC transformer topology is composed of M DC transformer units with input in series and output in parallel (ISOP), and each DC transformer unit contains N (N≥3) sub-modules with input in series and output in parallel. Contains an input filter capacitor C on the MV DC side ini , a bridge arm consisting of two switching tubes connected in series, and a transmission inductance L si , a DC blocking capacitor C di with the primary winding of the transformer. Contains an output filter capacitor C on the low voltage DC side oi , a bridge arm composed of two switch tubes in series and the secondary winding of the transformer.
[0029] In the i-th sub-module of the j-th D...
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The invention discloses a DC transformer based on a centralized multi-winding high-frequency transformer, and a control method of the direct-current transformer. The transformer comprises M DC transformer units with input ends connected in series and output ends connected in parallel, wherein the medium-voltage DC side input ports of the M DC transformer units are connected in series to form a medium-voltage DC side port of the DC transformer, and low-voltage DC side output ports of the M DC transformer units are connected in parallel to form a low-voltage DC side port of the DC transformer. The multi-winding high-frequency transformers among the DC transformer units are mutually independent; each DC transformer unit comprises N submodules, the inputs of which are connected in series and the outputs of which are connected in parallel, wherein N is greater than or equal to 3; the input filter capacitors Cini of the submodules are connected in series to form a medium-voltage DC side input port of the unit, and the output filter capacitors Coi are connected in parallel to form a low-voltage DC side output port of the unit. According to the transformer, the bidirectional transmission of power between the medium-voltage DC side and the low-voltage DC side can be realized by controlling a phase shift angle between primary and secondary side bridge arms of the transformer in each sub-module, and zero-voltage switching-on of all switch tubes is realized.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a DC transformer and a control method based on a centralized multi-winding high-frequency transformer suitable for a medium-voltage DC distribution network. Background technique [0002] In recent years, with the development of distributed energy and the increase of DC loads, medium and low voltage DC power distribution systems have received extensive attention. As the key equipment in medium and low voltage DC power distribution system, DC transformer has become a research hotspot. At present, the DC transformer generally adopts the structure of input series connection and output parallel connection, so as to reduce the voltage stress of the switching device on the medium voltage DC side and the current stress of the switching device on the low voltage DC side. At the same time, the modular structure improves the reliability and fault redundancy performanc...
Claims
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0058Y02B70/10
Inventor 陈武舒良才何晓坤
Owner SOUTHEAST UNIV