High-voltage side series connection and low-voltage side parallel connection conversion system
A conversion system, low-voltage side technology, applied in the field of power electronic conversion, can solve the problems of increasing the difficulty of electronic conversion system design, widening the voltage gain range, reducing conversion efficiency, etc., to reduce the range of gain variation, improve conversion efficiency, reduce The effect of small loss
Active Publication Date: 2020-10-09
DELTA ELECTRONICS (SHANGHAI) CO LTD
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Problems solved by technology
[0004] In the DC / DC conversion structure where the high-voltage side is connected in series and the low-voltage side is connected in parallel, since the voltage of the low-voltage side remains unchanged, the function of the bypass will widen the voltage gain range of each DC / DC module, resulting in the difficulty of designing the electronic conversion system increase, the conversion efficiency decreases
Taking N modules as an example, before the faulty DC / DC module is bypassed, the voltage gain of each DC / DC module is M 1 =V DC2 / (V DC1 / N), after the faulty DC / DC module is bypassed, the voltage gain of each DC / DC module changes to M 2 =V DC2 / (V DC1 / (N-1)), the voltage V on both sides of the electronic conversion system DC1 , V DC2 In the case of no change, it is necessary to take into account M in the design process of the converter 1 , M 2 Two kinds of voltage gains, which ultimately lead to the conversion efficiency being affected
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[0066] According to an example embodiment of the present invention, the preset number may be greater than, equal to or smaller than the number of the DC / DC converters in the preset state.
[0067] According to an exemplary embodiment of the present invention, any DC / DC converter 11 further includes a DC bus capacitor C, wherein one end of the bypass circuit, the positive end of the DC bus capacitor and one of the DC / DC converter The positive end of one side is electrically coupled, and the other end of the bypass circuit, the negative end of the DC bus capacitor is electrically coupled with the negative end of one side of the DC / DC converter. During normal operation, there are k DC / DC converters in working state, and the remaining r DC / DC converters are in cold backup state (k+r=N·n). Among them, when all DC / DC converters have not entered the preset state, the number k of DC / DC converters in the working state and the number r of DC / DC converters in the cold backup state are eq...
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The invention provides a high-voltage side series connection and low-voltage side parallel connection conversion system, and the circuit comprises N power units, wherein each power unit comprises n DC / DC converters, k DC / DC converters are in a working state during normal work, r DC / DC converters are in a cold backup state, and k + r = N*n; n bypass circuits which are connected to the correspondingDC / DC converters in parallel; a detection unit which is connected with each DC / DC converter in the corresponding power unit and is used for detecting the DC / DC converter; a control unit which is connected with the corresponding detection unit, wherein when the corresponding DC / DC converter is in a preset state, the corresponding control unit outputs a preset signal; and a main control unit whichis coupled with the N control units, receives the preset signals and outputs bypass signals and release signals to the corresponding control units according to the preset signals. The conversion system provided by the invention is small in loss and beneficial to further improvement of efficiency.
Description
technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a conversion system in which a high-voltage side is connected in series and a low-voltage side is connected in parallel. Background technique [0002] In the occasion of high-voltage DC-DC conversion, a power electronic conversion system composed of multiple DC / DC modules connected in series is often used to realize the high-voltage DC-to-DC conversion function. When a certain DC / DC module in the electronic conversion system is in a preset state, it will directly affect the normal operation of the entire electronic conversion system, so it is necessary to bypass the faulty DC / DC module in time to ensure that the electronic conversion system does not fail Stable operation can be continued without the influence of the DC / DC module. [0003] However, the techniques for bypassing faulty DC / DC modules in the prior art have the following problems: [0004] In the ...
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IPC IPC(8): H02M3/00
CPCH02M1/32H02M3/02H02J1/102H02M1/0074H02M1/0009H02M1/325H02M1/36
Inventor 刘腾应建平张怡胡光铖王欣娄德海曹赟
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD