Coordinated control device and method for MMC (modular multilevel converter) type unified power quality conditioner

A power quality and coordinated control technology, applied in AC network voltage adjustment, reactive power adjustment/elimination/compensation, reactive power compensation, etc. Problems such as the inability to efficiently unify the UPQC comprehensive management function of the power quality regulator

Inactive Publication Date: 2013-12-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] Aiming at the serious overcurrent phenomenon on the current series side, endangering the operation safety of IGBT devices and the inability to efficiently play the comprehensi

Method used

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  • Coordinated control device and method for MMC (modular multilevel converter) type unified power quality conditioner
  • Coordinated control device and method for MMC (modular multilevel converter) type unified power quality conditioner
  • Coordinated control device and method for MMC (modular multilevel converter) type unified power quality conditioner

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Embodiment Construction

[0102] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0103] The technical problem to be solved by the present invention is to provide a coordinated control method, which optimizes the control method on the basis of the determined UPQC device, system and load parameters. The advantage of this method is that when UPQC compensates for three-phase voltage sag and harmonics, reactive power, and unbalanced current at the same time, it can ensure that the IGBT of the converter switching device on the series side of the device works within the rated current range and avoid overcurrent The damage caused; can also make full use of the energy storage of the sub-module capacitor of the UPQC device, and provide the required active support when the overcurrent caused by the three-phase voltage sag is compensated and reaches the upper limit of the IGBT tolerance range.

[0104] The coordinated c...

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Abstract

The invention belongs to the technical field of medium-voltage flexible alternating current power transmission and distribution and power electronic control of power systems, and particularly relates to a coordinated control device and method for an MMC (modular multilevel converter) type unified power quality conditioner. The coordinated control device comprises the MMC type unified power quality conditioner and a coordinated controller thereof, common direct current is allowed to run in a voltage reducing manner by limiting active current component maintaining common direct current voltage stable in three-phase current of an outlet of an MMC on a parallel side, the current of a secondary side of a series coupling transformer and system current are limited within the safety running range of the conditioner, and voltage sag amplitude which can be compensated by the conditioner is improved. According to the coordinated control method, the UPQC (unified power quality conditioner) can fully function in comprehensive treatment process, and reliable running of the MMC on the series side of the UPQC is ensured to a large extent. The coordinated control method is simple and reliable in design, applicable to UPQCs with different device parameters and adaptable to change of load capacity.

Description

technical field [0001] The invention belongs to the technical field of medium-voltage flexible AC power transmission and distribution and power electronic control in power systems, and specifically relates to a coordinated control device and method for an MMC-type unified power quality regulator. Background technique [0002] With the development of power electronics technology and device manufacturing industry, high-performance power electronics circuits and equipment have been more and more used in power systems, aerospace and locomotive traction and other fields. While high-automation and high-intelligence technologies bring convenience to people's lives, they also bring disturbances such as nonlinearity, impact, and volatility to the power system. High-quality and efficient electric energy has become the common goal pursued by both the power supply side and the user. Therefore, the quality of electric energy has attracted increasing attention. Unified Power Quality Cond...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/18
CPCY02E40/30
Inventor 陆晶晶肖湘宁袁敞陈罡
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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