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Voltage compensation and uninterrupted power supply method for dynamic voltage restorer based on photovoltaic power generation unit

A technology of dynamic voltage recovery and power generation unit, applied in the field of electric power, can solve the problems of difficult realization, long life time, high cost, etc.

Inactive Publication Date: 2019-03-29
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the voltage drop restorers implemented today are storage types, common capacitors are low cost and easy to use, but have low energy density and limited lifetime
Supercapacitors have a relatively high energy density, can be quickly charged and discharged and have a long life, but the cost is high, and the current technology is not very mature, so it is difficult to realize

Method used

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  • Voltage compensation and uninterrupted power supply method for dynamic voltage restorer based on photovoltaic power generation unit
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  • Voltage compensation and uninterrupted power supply method for dynamic voltage restorer based on photovoltaic power generation unit

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Embodiment Construction

[0020] In order to facilitate a better understanding of the content of the present invention, the following will be further elaborated in conjunction with specific examples.

[0021] Such as figure 1 As shown, the present invention provides a schematic structural diagram of a dynamic voltage restorer based on a photo-storage power generation unit, the system mainly includes a PV array, a storage battery pack, a rectifier, 2 DC / DC converters, and 1 AC / DC converter and series transformers, as well as power semiconductor switches S, S 1 , S 2 and K 1 、K 2 .

[0022] In the embodiment of the present invention, when the system is running normally, S 1 Closed, the DVR is in bypass mode, the microgrid is connected to the grid and the distribution network voltage and the microgrid voltage are both normal voltages, the switch S is closed, and the S 2 disconnected; when the microgrid is running in an isolated island, the switch S is disconnected, and S 2 disconnect.

[0023] Suc...

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Abstract

The invention discloses a voltage compensation and uninterrupted power supply method for a dynamic voltage restorer based on a photovoltaic power generation unit. The voltage compensation and uninterrupted power supply method for a dynamic voltage restorer based on a photovoltaic power generation unit sets an energy storage device of the dynamic voltage restorer as a photovoltaic power generationunit, and uses a rectifier to connect with a distribution network to properly control the switching signals therein to achieve voltage sag and voltage swell suppression, and reduce the capacity of energy storage and the cost, and at the same time, when the power supply is interrupted or when the light is sufficient, the photovoltaic power generation unit can be used as an online UPS function to continuously supply power to the load. The voltage compensation and uninterrupted power supply method for a dynamic voltage restorer based on a photovoltaic power generation unit improves the reliability of the system, rationally utilizes the photovoltaic power generation unit, improves the equipment utilization rate, improves power supply quality, and achieves energy saving and emission reduction.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for voltage compensation and uninterrupted power supply of a dynamic voltage restorer based on a photovoltaic storage power generation unit. Background technique [0002] The microgrid can realize the integrated operation of internal power supply and load, and can coordinate and control with the main grid. When the main grid suffers a major fault or even collapses, the important loads in the region can still be continuously supplied with power. Although the microgrid technology has many advantages, random energy sources (solar energy, wind energy) in the microgrid will have an impact on the power quality of the microgrid. Effects of drops, sudden rises, momentary interruptions and other disturbances. [0003] In the prior art, the dynamic voltage restorer can effectively guarantee the power supply quality of the load, and thus has received extensive attention an...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32H02J9/06
CPCH02J3/382H02J3/32H02J9/062Y02B10/70Y02B70/30Y02E10/56Y02E70/30Y04S20/20
Inventor 湛若水蒋小明唐惟楚
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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