Priority considered power quality and noise comprehensive evaluation method for convertor transformer

A power quality and comprehensive evaluation technology, applied in the field of power grids, can solve problems such as high noise and poor power quality

Active Publication Date: 2015-05-27
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a comprehensive evaluation method for the power quality and noise of the converter transformer considering t

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  • Priority considered power quality and noise comprehensive evaluation method for convertor transformer
  • Priority considered power quality and noise comprehensive evaluation method for convertor transformer
  • Priority considered power quality and noise comprehensive evaluation method for convertor transformer

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0027] Such as figure 1 As shown, the steps of a comprehensive evaluation method for power quality and noise of a converter transformer considering priority in this embodiment include:

[0028] 1) Acquisition signal: within the preset sampling period S, the voltage signal, current signal and noise signal of the converter transformer are continuously collected;

[0029] 2) Calculate the index value: Calculate the harmonic current index value, voltage total harmonic distortion index value, three-phase voltage unbalance index value, and voltage deviation index value according to the voltage signal and current signal. The harmonic current index value is The amplitude of the harmonic current signal obtained by harmonic decomposition of the current signal, and the no...

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Abstract

The invention discloses a priority considered power quality and noise comprehensive evaluation method for a convertor transformer. The method comprises the following steps: (1), voltage, current and noise signals of the convertor transformer are acquired; (2), index values are calculated according to the acquired signals; (3), evaluated values are calculated according to the index values and standard values; (4), the evaluation priority is divided, and the operation state of the convertor transformer is evaluated. The convertor transformer is evaluated by priority division of the evaluated values, so that the operation state of the convertor transformer can be judged rapidly; meanwhile, internal relation of the power quality and noise of the convertor transformer is reflected through the power quality and noise evaluated values, power quality and noise comprehensive evaluation of the operation state of the convertor transformer can be realized online, and reference is provided for judging potential problems of the convertor transformer.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for comprehensively evaluating power quality and noise of a converter transformer in consideration of priorities. Background technique [0002] Converter transformers include converter transformers for HVDC transmission, industrial converter transformers and traction converter transformers. At present, the main problems facing the converter transformer are poor power quality and high noise, mainly because it undertakes the task of AC and DC power conversion, and is mainly used in places with high power conversion. During the power conversion process, the load will generate a large number of Harmonic, its intrusion into the transformer will cause the transformer to heat up and vibrate, and the noise will increase; at the same time, due to the conversion of AC and DC power, the transformer is prone to DC bias, which will cause even-order components of the transformer e...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F19/00
CPCH02J3/00H02J2203/20
Inventor 宁志毫张斌陈跃辉周冠东左剑
Owner STATE GRID CORP OF CHINA
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