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Calculation method of audible noise of power capacitor unit based on small load current injection

A technology of power capacitor and current injection, applied in the direction of noise figure or signal-to-noise ratio measurement, can solve the problems of expensive and complicated test equipment, and achieve the effect of reducing the cost

Active Publication Date: 2017-10-24
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

Although this method can directly measure the noise of the capacitor unit, it needs to inject a large load harmonic current consistent with the actual working conditions into the capacitor during the measurement, and the test equipment is complex and expensive

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  • Calculation method of audible noise of power capacitor unit based on small load current injection
  • Calculation method of audible noise of power capacitor unit based on small load current injection
  • Calculation method of audible noise of power capacitor unit based on small load current injection

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Embodiment Construction

[0015] The audible noise calculation method of power capacitor unit based on small load current injection of the present invention is divided into four links: small load current injection, measurement of noise sound pressure level under multiple small load conditions, and noise under multiple small load conditions The calculation of power level, the establishment of the calculation formula of noise sound power level under heavy load conditions, and the calculation of noise sound power level under heavy load conditions. The present invention is based on the capacitor unit noise power level L obtained from experiments W It is based on the logarithmic relationship with the magnitude of the injected harmonic current i.

[0016] The audible noise calculation method of power capacitor unit based on small load current injection of the present invention specifically includes the following steps:

[0017] 1) Place the sample capacitor unit 1 in a semi-anechoic room with very low background ...

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Abstract

The invention discloses an audible noise calculation method based on small load current injected power capacitor unit, and the method comprises four steps: injecting the small load current, measuring the noise sound pressure level under the condition of multiple small loads, calculating the noise sound power level under the condition of multiple small loads, building the calculation formula for noise sound power level under the condition of big load and calculating the noise sound power level under the condition of big load. The method can calculate the noise under the big load current injected condition at the condition of injecting the small current by using harmonic wave power supply with small power, the cost for the harmonic wave power supply device can be greatly reduced.

Description

Technical field [0001] The present invention relates to a method for calculating audible noise of a power capacitor unit (capacitor unit for short), in particular to a method for calculating audible noise of a power capacitor unit based on small load current injection. Calculate the noise when working with large load current on the premise of the obtained noise. Background technique [0002] At present, there are two methods to obtain the noise of the capacitor unit: The first method is to use the vibration-to-sound conversion formula to calculate the indirect measurement method of the radiated noise power of the capacitor unit based on the vibration of the capacitor unit casing. [1][2] . Because this method needs to measure the vibration of different parts of the capacitor unit shell and make assumptions about the vibration-acoustic radiation efficiency, the noise of the capacitor unit obtained is far from the actual. The second method is to use the power capacitor audible nois...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/26
Inventor 黄莹黄成黎小林李志远陆益民陈品魏浩征黄国兴邱伟李凌飞
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD