Active power decoupling device and control method without adding additional switching devices

A technology of switching devices and decoupling devices, applied in the field of active power decoupling devices, can solve the problems of increasing system cost, reducing system efficiency, increasing system modulation complexity, etc., and achieve system cost reduction, efficiency improvement, fast and accurate tracking effect of ability

Active Publication Date: 2017-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of decoupling method still requires an additional one-third of the semiconductor device, which increases the cost of the system and reduces the efficiency of the system; and the switch multiplexing inevitably increases the complexity of system modulation

Method used

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  • Active power decoupling device and control method without adding additional switching devices
  • Active power decoupling device and control method without adding additional switching devices
  • Active power decoupling device and control method without adding additional switching devices

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the drawings as follows:

[0035] Such as figure 1 As shown, the active power decoupling device disclosed in the present invention without additional switching devices includes a single-phase input power source 1, an input filter 2, a current-type H-bridge circuit 3, a power decoupling capacitor 4, and an output Filter 5 and DC load 6; Single-phase input power supply 1 is directly connected to the grid or connected to the secondary side of a single-phase transformer; Current-type H-bridge circuit 3 is connected to single-phase input power supply 1 through the input filter 2; Two power decoupling capacitors 4 are connected across the current-type H-bridge circuit 3; the output DC side of the current-type H-bridge circuit 3 is connected to the DC load 6 through the DC-side filter inductor 5.

[0036] Among them, the power decoupling capacitor 4 is composed of two decoupling capacitors C1 and C2 of equ...

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Abstract

The invention discloses an active power decoupling device and a control method without adding additional switching devices, which is realized by adding two additional energy storage capacitors in the topology of a conventional single-phase current-type converter. In each power frequency cycle, each energy storage capacitor works in turn to complete the absorption and release of the inherent secondary pulsating power in the single-phase current-source converter. Compared with conventional active decoupling devices, it does not need to add additional switching devices, which is beneficial to reduce system cost and improve system efficiency. The DC current in the active decoupling device is corrected in real time by the decoupling circuit, and the average value of the decoupling capacitor voltage is kept constant by the rectification stage circuit. The system control does not depend on precise system parameters, and has strong robustness; only a simple PI controller can realize fast and error-free tracking of the control target, and the controller design is easy.

Description

Technical field [0001] The invention relates to an active power decoupling device and a control method without additional switching devices. Background technique [0002] Single-phase converters include single-phase voltage-type converters and single-phase current-type converters, which have been widely used in low-power applications such as photovoltaic power generation systems, fuel cell systems, battery energy management systems, and LED lamp driving. The secondary pulsating power inherent in single-phase converters not only damages the input and output performance, but also reduces the life of capacitors, batteries and other components. Therefore, how to deal with the instantaneous power imbalance of the input and output terminals and eliminate the influence of the secondary pulsating power on the system has become a practical problem. [0003] Although the passive decoupling device that greatly increases the capacity of passive components to alleviate the secondary pulsating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
Inventor 孙尧刘永露但汉兵张关关杨建韩华彭涛王春生
Owner CENT SOUTH UNIV
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