Active power decoupling device without additional switching element and control method therefor

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: 2015-09-02
CENT SOUTH UNIV
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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 s

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  • Active power decoupling device without additional switching element and control method therefor
  • Active power decoupling device without additional switching element and control method therefor
  • Active power decoupling device without additional switching element and control method therefor

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Embodiment Construction

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

[0035] Such as figure 1 As shown, an active power decoupling device disclosed in the present invention does not need to add additional switching devices, which includes a single-phase input power supply 1, an input filter 2, a current-type H-bridge circuit 3, a power decoupling capacitor 4, an output A filter 5 and a DC load 6; the single-phase input power supply 1 is directly connected to the power grid or to the secondary side of a single-phase transformer; the current-type H-bridge circuit 3 is connected to the single-phase input power supply 1 through the input filter 2; Two power decoupling capacitors 4 are connected across the current-mode H-bridge circuit 3 ; the output DC side of the current-mode 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 tw...

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Abstract

The invention discloses an active power decoupling device without an additional switching element and a control method therefor. The active power decoupling device is achieved by increasing two additional energy storage capacitors in the topological structure of a conventional single phase current source converter. During each power frequency period, the energy storage capacitors work by turns to complete absorption and release of inherent secondary pulse power of the single phase current source converter. Compared with a conventional active decoupling device, the active power decoupling device provided by the invention requires no additional switching element, thereby helping reducing the system cost and improving the system efficiency. Direct current of the active power decoupling device is timely corrected by a decoupling circuit, and the mean value of voltage of a decoupling capacitor is maintained constant by a rectifier state circuit. The system control is not dependent on accurate system parameters, and the robustness is strong. Only a simple PI controller is required to achieve rapid and error-less tracking of a target, and the controller is easy to design.

Description

technical field [0001] The invention relates to an active power decoupling device and a control method without adding additional switching devices. Background technique [0002] Single-phase converters include single-phase voltage converters and single-phase current 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 drives. The secondary pulsating power inherently exists in single-phase converters, which will not only damage the input and output performance, but also reduce the life of components such as capacitors and batteries. Therefore, how to deal with the instantaneous power imbalance at the input and output terminals and eliminate the impact of the secondary pulsating power on the system has become a problem of practical significance. [0003] Although the passive decoupling device that greatly increases the capacity of passive components t...

Claims

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Application Information

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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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