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EVALUATION METHOD FOR MMC-HVDC TRANSIENT DISTURBANCE INTERACTIVE INFLUENCES

A MMC-HVDC, transient disturbance technology, applied in the direction of power transmission AC network, etc., can solve problems such as overcurrent, overvoltage, affecting the life and operating state of the valve group in MMC

Active Publication Date: 2019-04-26
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

Practical engineering and theoretical studies have found that when a transient disturbance occurs on the AC side or DC side transmission line of the MMC-HVDC system, it will cause overcurrent and overvoltage effects on the upper and lower bridge arms of the MMC rectifier station, and directly affect the MMC internal valve group. Life and operating status

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  • EVALUATION METHOD FOR MMC-HVDC TRANSIENT DISTURBANCE INTERACTIVE INFLUENCES
  • EVALUATION METHOD FOR MMC-HVDC TRANSIENT DISTURBANCE INTERACTIVE INFLUENCES
  • EVALUATION METHOD FOR MMC-HVDC TRANSIENT DISTURBANCE INTERACTIVE INFLUENCES

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Embodiment Construction

[0039] MMC consists of three-phase six bridge walls, and each bridge wall consists of several interconnected sub-modules (SM) with the same structure and a reactor , an equivalent impedance Composed in series, the upper and lower bridge walls form a phase unit, such as figure 1 shown. and Respectively, the valve side voltage and current, is the DC voltage, , are the positive and negative DC bus currents respectively, and the average value is . The bridge wall voltage can be controlled by 6 voltage sources , to be equivalent, the subscript p , n are the upper bridge wall and the lower bridge arm respectively, and the corresponding bridge arm currents are and . Engineering experiments show that when a transient fault occurs on the AC transmission line, the energy distribution of the upper and lower bridge arms of each phase in the MMC rectifier station is different. However, due to the complex transient components of the electrical signals of each phase...

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Abstract

The invention relates to an evaluation method of the transient disturbance interactive influence states of MMC (multilevel modular converter)-HVDC (high voltage direct current transmission) and belongs to the flexible direct current transmission technical field. According to the evaluation method, based on analysis on the change of electrical information in an MMC (multilevel modular converter), the severity degree of influence on the MMC by alternating current line failure or disturbance can be accurately reflected, and then health judgment on the operating state of the MMC (multilevel modular converter) can be realized. The method of the invention includes the following steps that: data are acquired, and the data are normalized; the Tsallis entropy weight of each index is determined; the Tsallis entropy weight is normalized; a correlation degree matrix is determined; weighted correlation degree solving is carried out; and sorting is carried out according to correlation degrees, the greater the correlation degrees are, the closer obtained results to an ideal sample. With the method of the invention adopted, the severity degree of influence on the MMC by the alternating current line failure or disturbance can be accurately reflected, and health judgment on the operating state of the MMC (multilevel modular converter) can be realized.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission. Background technique [0002] In 2001, Rainer Marquardt of the Bundeswehr University in Munich, Germany proposed the concept of a multilevel modular converter (MMC). In November 2010, the world's first flexible direct current transmission (MMC-HVDC) project based on modular multilevel converters - Trans Bay Cable project was put into operation in San Francisco, USA. Practical engineering and theoretical studies have found that when a transient disturbance occurs on the AC side or DC side transmission line of the MMC-HVDC system, it will cause overcurrent and overvoltage effects on the upper and lower bridge arms of the MMC rectifier station, and directly affect the MMC internal valve group. life and operating conditions. If an evaluation method is proposed, through the analysis of the changes in the electrical information in the MMC converter station, it can accurat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 陈继开窦延辉李扬王鹤李江辛业春王振浩李国庆
Owner NORTHEAST DIANLI UNIVERSITY
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