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Low-voltage ripple control method under power distribution change of multi-port converter, and multi-port converter

A converter and multi-port technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, control/regulation system, etc., can solve the problem of large output voltage ripple, achieve ripple reduction, The effect of improving dynamic performance

Active Publication Date: 2021-06-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, in the control strategy based on the three-stage adjustment of the output filter inductor current, the charging charge or discharging charge is completely proportional to the change in power distribution, so that the ripple of the output voltage is still large under sudden changes in power distribution.

Method used

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  • Low-voltage ripple control method under power distribution change of multi-port converter, and multi-port converter
  • Low-voltage ripple control method under power distribution change of multi-port converter, and multi-port converter
  • Low-voltage ripple control method under power distribution change of multi-port converter, and multi-port converter

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] figure 1 It is a multi-port converter system of the low voltage ripple control method under the power distribution change of the present invention, and the multi-port converter is constituted as follows: port one U 1 Both ends of the parallel filter capacitor C 1 , filter capacitor C 1 It is connected in parallel with both ends of the single-phase bridge arm 1 composed of switch tubes SA1 and SA2 connected in series; the middle point of the single-phase bridge arm 1 is connected to one end of the primary side of the transformer 1; port two U 2 Both ends of the parallel filter capacitor C 2 , filter capacitor C 2 It is connected in parallel with both ends of the single-phase bridge arm 2 composed of switching tubes SB1 and SB2 connected in series; the middle point of the single-phase bridge arm 2 is connected with the other end of the primary side of the tran...

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Abstract

The invention discloses a low-voltage ripple control method under power distribution changes of a multi-port converter, and a multi-port converter, and aims at a control strategy based on three-section adjustment of output filter inductive current in the prior art. In a power distribution change process, a voltage ripple peak value is in direct proportion to a charging charge or a discharging charge, therefore, the ripple of the output voltage is still large under the sudden change of power distribution. According to the low-voltage ripple control method under the power distribution changes of the multi-port converter and the multi-port converter provided by the invention, the charging and discharging current of a forward branch and the inductive current of a reverse branch are controlled to meet the following conditions: the charging and discharging current and the inductive current are in three sections, the charging and discharging current waveform of the forward branch and the inductive current wave of the reverse branch in the two zero crossing point time periods form central symmetry, so that the ripple of the output voltage under the power distribution changes is reduced, and the dynamic performance of a multi-port converter system under the power distribution changes is improved.

Description

technical field [0001] The invention relates to the technical field of DC converter control, and mainly relates to a low-voltage ripple control method and a multi-port converter under changing power distribution of the multi-port converter. Background technique [0002] Multi-output source converters are widely used in new energy complementary power generation systems. In the traditional multi-output source converter system structure, each energy source is connected to the load through an independent converter. This system structure is independent in control, but there are switching elements that work independently in time-sharing, and the number of filter inductors and filter capacitors is large. The multi-port converter connects multiple input sources and loads together through a converter, which has high integration, high power density, and low cost. It is the main research direction of the multi-output source converter at present. [0003] Compared with the traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33576H02M3/33561
Inventor 王宇张成糕张艺郝雯娟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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