Method for detecting periodic and random changes of output frequency of alternating-current voltage source
A technology of AC voltage source and output frequency, which is applied in the field of detection of periodic and random changes in the output frequency of AC voltage sources. sexual effect
Active Publication Date: 2020-06-05
天津天传电控设备检测有限公司 +1
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Although the instantaneous frequency change of the output voltage of the voltage source within 1 minute can be evaluated by measuring the frequency modulation amplitude, there is no clear detection method for the periodic or random change of the output voltage frequency of the voltage source
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[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0025] Design idea of the present invention is:
[0026] Due to the relationship between frequency and time, and the actual test process is to detect the output frequency of the voltage source for a period of time, and the frequency modulation amplitude refers to the difference between the maximum value and the minimum value of the instantaneous frequency within a time interval of 1 minute, therefore, the frequency modulation amplitude is first The effects of average frequency on periodic and random variations are excluded. The frequency modulation amplitude can only represent the amount of instantaneous frequency change, but it cannot represent the periodicity and randomness of the output frequency. At this time, it needs to be represented by frequency modulation spectrum. The invention evaluates the periodic or random change of the frequency by measurin...
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The invention relates to a method for detecting periodic and random changes of the output frequency of an alternating-current voltage source. The method comprises the following steps: measuring the full output voltage of alternating-current voltage for a period of time; calculating the instantaneous frequency of the output voltage; determining the frequency modulation amplitude of the AC output voltage; summarizing all frequency modulation amplitudes after the test is started for a period of time to form a time domain curve of the frequency modulation amplitudes; obtaining a curve of a frequency modulation frequency spectrum of the output voltage through Fourier transform of the frequency modulation amplitude time domain curve; and observing the frequency change period of the output voltage of the alternating-current voltage source and the frequency change amplitude of the alternating-current voltage source corresponding to the change period through the curve of the frequency modulation spectrum. The function of detecting the periodic and random changes of the output frequency around the average frequency is realized, the periodic and random changes of the output frequency around the average frequency can be visually expressed, and the method is suitable for detecting the output voltage frequency modulation frequency spectrums of all AC voltage sources.
Description
technical field [0001] The invention belongs to the technical field of AC voltage sources, in particular to a detection method for periodic and random changes in the output frequency of an AC voltage source. Background technique [0002] In modern power supply systems, generators or power electronic devices can be used as AC voltage sources to provide electrical energy for various electrical loads. The stability of the output voltage amplitude of the voltage source is very important to the electric load. Many existing technologies need to keep the output voltage amplitude stable and detect it. However, the stability of the output voltage frequency of the voltage source is also very important for the electrical load. Although the instantaneous frequency change within 1 minute of the output voltage of the voltage source can be evaluated by measuring the frequency modulation amplitude, there is no clear detection method for the periodic or random change of the output voltage f...
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IPC IPC(8): G01R31/42G01R23/02G01R23/16
CPCG01R31/42G01R23/02G01R23/16
Inventor 王鹏吴健甘长英段毅王沙王姜骅马利勇张艺娜
Owner 天津天传电控设备检测有限公司