Method of measuring electrical power system signal frequency and harmonic wave parameters
A power system and signal frequency technology, which is applied in the field of measuring power system signal frequency and harmonic parameters, can solve problems such as long calculation time, high number of iterative formulas, and large signal analysis errors
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[0035] The schematic diagram of the present invention is shown in figure 2 (M is the maximum harmonic order analyzed), where the waveform of the actual signal is shown in image 3 , the windowed waveform is shown in Figure 4 , the spectrogram after the estimation algorithm is shown in Figure 5 , harmonic amplitude and phase error analysis form shown in Table 1.
[0036] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but they are not intended to limit the present invention.
[0037] The present invention can be used as a digital substation to perform harmonic measurement in a system that samples power signals according to the IEC61850-9-2 standard frame digital sampling rate. At present, the sampling rate of most digital substations is 10kHz, and a voltage harmonic signal is selected. x(t), such as image 3 shown.
[0038] The harmonic detection method of asynchronous sampling of the present...
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