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Power quality compound control device based on nine-switching tube inverter and working method thereof

A nine-switch tube, composite control technology, applied in the direction of circuit devices, AC network circuits, AC network voltage adjustment, etc., can solve problems affecting user power quality, voltage sag and three-phase imbalance

Active Publication Date: 2018-02-23
SOUTHEAST UNIV
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Problems solved by technology

At the same time, with the technical update of electrical equipment, problems such as voltage sag and three-phase imbalance have become one of the most important power quality problems affecting users

Method used

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  • Power quality compound control device based on nine-switching tube inverter and working method thereof
  • Power quality compound control device based on nine-switching tube inverter and working method thereof
  • Power quality compound control device based on nine-switching tube inverter and working method thereof

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0060] The present invention provides a power quality composite control device and working method based on a nine-switch tube inverter. Two sets of output ports provided by the nine-switch tube inverter are used to form a DVR function port and an APF function port respectively, so that the same The two functions are combined in a grid-connected device, which reduces the system investment cost, improves the flexibility of device installation and broadens the application field.

[0061] The present invention uses a nine-switch inverter as the main circuit, such as figure 1The topology shown can be seen as a superposition of two three-phase full-bridge inverters, providing two independent output ports. Compared with the traditional twelve-switch tube inverter, the nine-switch tube inverter saves three switch tubes while maintaining the same functi...

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Abstract

The invention discloses a power quality compound control device based on a nine-switching tube inverter. The main circuit structure of the device based on the nine-switching tube inverter provides twooutput ports, the output port at the upper end is connected to a grid in series through a coupling transformer to achieve the function of a dynamic voltage restorer (DVR), and the output port at thelower end is directly connected to the grid in parallel to achieve the function of an active power filter (APF). The DVR port controls output voltage by means of a load control strategy based on gridvoltage feedforward and load voltage feedback, so that voltage sag and three-phase imbalance are compensated for rapidly and accurately. The ARF port detects a harmonic current by means of an improvedFBD method based on an averaging method and a phase-leading network, and controls an output current by means of multiple quasi-PR control, so that detection and compensation of the harmonic current,an unbalanced current and a reactive current are completed rapidly and accurately. The power quality compound control device based on the nine-switching tube inverter has the advantages that three switching tubes are saved, the production cost is reduced, the installation flexibility of the device is improved and the application field is broadened.

Description

technical field [0001] The present invention relates to the fields of inverter control and power quality control, and relates to a composite power quality control device and working method based on a nine-switch tube inverter, and specifically relates to the use of a new type of inverter structure and a suitable control method To realize the functions of Dynamic Voltage Restorer (DVR) and Active Power Filter (APF) at the same time, and complete the power quality analysis of voltage sag, voltage unbalance and harmonic current in the power grid. effective governance of the problem. Background technique [0002] In recent years, with the rapid development of the power industry, various new equipment and devices based on power electronics technology have emerged and are widely used in power systems. Although the application of power electronics devices with nonlinear electrical characteristics brings A series of economic benefits and various conveniences such as improving the e...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/01H02J3/26
CPCH02J3/01H02J3/12H02J3/26H02J2203/20Y02E40/20Y02E40/50
Inventor 吴在军李晨阳赵原胡文强窦晓波胡敏强
Owner SOUTHEAST UNIV
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