High-capacity UPQC and control method thereof

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: 2014-03-05
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
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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 invent

Method used

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  • High-capacity UPQC and control method thereof
  • High-capacity UPQC and control method thereof
  • High-capacity UPQC and control method thereof

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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 UPQC for flexibility power transmission and distribution of a power system, in particular to a high-capacity UPQC and a control method of the high-capacity UPQC. The high-capacity UPQC is applied to the parallel-connection side of the UPQC by using the structure that a secondary side of a multi-winding transformer is connected with an H-bridge convertor. Three phases on the parallel-connection side are equivalent to three single-phase rectifier models connected to line voltage in a cross mode. As being controlled independently, each H-bridge rectifier is not affected by unbalance of three-phase voltage, and the stability of voltage across the direct current side of the UPQC when network voltage fluctuates is facilitated. A control method based on virtual orthogonal coordinate conversion is adopted, the single-phase rectifier models on the parallel-connection side of the UPQC are equivalent to a three-phase rectifier model, the functions of the controllable power factor and harmonic suppression of a three-phase rectifier are achieved, and all functions of the three-phase rectifier on the condition of the symmetric system voltage can be completely achieved.

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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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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