Dynamic voltage regulator

A DC voltage and compensator technology, applied in the field of electric power, can solve problems such as high cost, complex structure, and large volume, and achieve the effects of fast charging and discharging, high energy density, and reduced volume

Inactive Publication Date: 2019-06-07
GUANGZHOU POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing voltage sag compensator needs three independent single-phase inverters and an additional charging circuit, resulting in the existing voltage sag compensator having complex structure, large volume and high cost

Method used

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. In particular, the following examples are only used to illustrate the present invention, but not to limit the scope of the present invention. Likewise, the following embodiments are only some but not all embodiments of the present invention, and all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0047] The invention provides a DC voltage sag compensator, which can realize the DC voltage sag compensator with simple structure, small volume and low cost.

[0048] See figure 2 , figure 2 It is a structural schematic diagram of an embodiment of the DC voltage sag compensator of the present invention. Such as figure 2 As shown, the DC voltage sag compensator includes: a first switching tube 27, a first switching tube anti-parallel diode 28,...

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Abstract

The invention discloses a dynamic voltage regulator. The dynamic voltage regulator comprises a first switch tube, a first switch tube anti-parallel diode, a second switch tube, a second switch tube anti-parallel diode, an inductor, a super capacitor group and a controller, wherein the super capacitor group is used as an energy storage unit; and the inductor, the first switch tube, the first switchtube anti-parallel diode, the second switch tube and the second switch tube anti-parallel diode form a bidirectional DC/DC topological circuit for charging and discharging to realize bidirectional energy flow. When the voltage sag of a DC bus of a frequency converter is detected, the given formula is adopted to obtain a first drive signal and output the first drive signal to the first switch tube, and the on-off state of the first switch tube is controlled, so that the super capacitor group supplies power. The dynamic voltage regulator has simple structure, small volume and low cost.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a DC voltage sag compensator. Background technique [0002] With the advent of the information age, more and more precision electrical equipment is put into the power grid. It is difficult for these precision equipment to work normally within a large voltage range. Therefore, it is particularly important to suppress the drop of the load supply voltage. An existing measure to suppress voltage sag is to install compensation equipment on the load side, and installing a DVR (Dynamic Voltage Regulator, DC voltage sag compensator) on the load side is currently one of the most effective measures to balance the load voltage. [0003] See figure 1 , figure 1 It is a structural schematic diagram of an existing voltage sag compensator. Such as figure 1 As shown, the voltage sag compensator includes an energy storage unit, an inverter unit, a filter, a series transformer and a ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02J7/34
Inventor 马智远莫文雄许中王勇栾乐伍衡张群峰叶志峰周凯郭倩雯李情王荣富
Owner GUANGZHOU POWER SUPPLY CO LTD
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