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Dynamic voltage recovery device

A technology of dynamic voltage recovery and capacitance, which is applied in the direction of AC network voltage adjustment, output power conversion device, electrical components, etc., can solve the problems of dynamic voltage restorer voltage waveform distortion and insufficient compensation ability, and achieve rapid response voltage compensation, Effects of Overcoming Insufficient Compensation Capability and Improving Structure

Pending Publication Date: 2019-03-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a dynamic voltage recovery device to solve the defects of voltage waveform distortion and insufficient compensation ability of dynamic voltage restorers in the prior art

Method used

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Embodiment Construction

[0019] Such as figure 1 As shown, the embodiment of the present invention discloses a dynamic voltage recovery device, which includes a DC input terminal 1, a single-phase four-switch inverter bridge arm 3, a low-pass filter 4, and an AC output terminal 5 sequentially connected through electrical connections; It includes an impedance source network 2, which is connected in series between the DC input terminal 1 and the single-phase four-switch inverter bridge arm 3; the impedance source network 2 includes a diode D 1 , capacitance C 1 and C 2 , and inductance L 1 and L 2 , the diode D 1 The anode of the DC input terminal 1 is connected at point A, and the diode D 1 The cathode, capacitance C 1 The positive pole and the inductor L 1 The current input terminal of the inductor L1 is connected to point B, and the current output terminal of the inductor L1 is connected to the capacitor C 2 The anode of the DC input terminal 1 is connected to point C, the negative pole of th...

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Abstract

The invention relates to the technical field of electric energy quality control, and relates to a dynamic voltage recovery device. The dynamic voltage recovery device includes sequentially electrically connected DC input terminal, single-phase four-switch inverter bridge arm, low-pass filter, and an AC output terminal, and also includes an impedance source network, wherein the impedance source network is connected between the DC input terminal and the single-phase four-switch inverter bridge arm in series. The dynamic voltage recovery device utilizes the impedance source network as the DC input terminal of inversion, thus improving the structure of the dynamic voltage recovery device, avoiding the occurrence of dead time, reducing the distortion rate of the inverter output waveform, improving the output efficiency of the inverter input and output voltage, and overcoming the defect of lack of compensation ability of the dynamic voltage recovery device when waveform distortion of voltageoccurs and the line voltage depth falls so as to achieve the purpose of quick response to voltage compensation.

Description

technical field [0001] The invention relates to the technical field of electric energy quality control, and more specifically relates to a dynamic voltage recovery device. Background technique [0002] In modern society, electric energy is one of the most widely used energy sources, and electricity consumption has become one of the main indicators to measure a country's development level. Among transient power quality problems, voltage sag is one of the common and frequently occurring problems. In the distribution network, short-circuit faults or large-scale motor startups will cause voltage sags. Due to the limited fault ride-through capability of some sensitive equipment, when a voltage drop occurs, it will cause the equipment to be out of operation, resulting in direct or indirect economic losses. In order to solve this problem, scholars at home and abroad have done a lot of research and proposed measures such as uninterruptible power supply, active power filter, unifie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02M7/5387H02M7/5395
CPCH02J3/12H02M7/53871H02M7/5395
Inventor 龙军郑宇琦周子富
Owner GUANGXI UNIV
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