A large-capacity unified power quality controller and its control method

A technology of power quality and control method, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., and can solve problems such as difficult control

Active Publication Date: 2016-09-21
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0009] Aiming at the disadvantage that the parallel side of the UPQC of the "parallel-serial" structure is not easy to control, the present invention provides a large-capacity unified power quality controller UPQC and its control method. tor structure applied to the parallel side of the UPQC

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  • A large-capacity unified power quality controller and its control method
  • A large-capacity unified power quality controller and its control method
  • A large-capacity unified power quality controller and its control method

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Embodiment Construction

[0070] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0071] The present invention provides a large-capacity unified power quality controller UPQC, the schematic diagram of which is as follows image 3 As shown, the unified power quality controller adopts a three-phase three-wire parallel-series structure, including parallel-connected voltage source converters and series-connected voltage source converters connected through a common DC bus; parallel-connected voltage source converters use multi-winding The single-phase transformer is connected to the single-phase H-bridge converter structure, the primary side of the multi-winding single-phase transformer is connected to the AC side power grid through a shunt reactor, and the secondary side of the multi-winding single-phase transformer is connected to the AC side of the H-bridge converter; the series connection Type voltage ...

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Abstract

The invention relates to a unified power quality controller UPQC for flexible power transmission and distribution in a power system, in particular to a large-capacity unified power quality controller UPQC and a control method thereof. The structure of the unified power quality controller using the secondary side of the multi-winding transformer connected to the H-bridge converter is applied to the parallel side of the UPQC. The three-phase parallel side is equivalent to three single-phase rectifiers modeled across the line voltage. Since each H-bridge rectifier is independently controlled, it is not affected by the unbalanced three-phase voltage, which is beneficial to the stability of the DC side voltage of the UPQC when the grid voltage fluctuates, and a control method based on virtual orthogonal coordinate transformation is adopted to make the parallel side of the UPQC The single-phase rectifier device is equivalent to a three-phase rectifier model, which has the functions of controllable power factor and harmonic suppression of the three-phase rectifier, and can fully realize all the functions of the three-phase rectifier under the condition of symmetrical system voltage.

Description

technical field [0001] The invention relates to a unified power quality controller UPQC for flexible power transmission and distribution in a power system, in particular to a large-capacity unified power quality controller UPQC and a control method thereof. Background technique [0002] The unified power quality controller UPQC is a new device in the custom power technology (Custom Power). It integrates the voltage compensation device and the current compensation device, and realizes multiple power quality adjustment functions in a unified way. One machine with multiple functions has higher cost performance. It is the latest trend and key equipment in the development of user power technology, and also the key equipment in FACTS technology. Therefore, the unified power quality controller UPQC has become a research hotspot in this field. [0003] The main circuit of unified power quality controller UPQC is composed of series voltage source converter and parallel voltage source...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/26
CPCY02E40/50
Inventor 张一博燕翚叶卫华訾振宁刘琳
Owner STATE GRID CORP OF CHINA
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