Harmonic injection device for harmonic impedance measurement of power grid
A technology of harmonic impedance and harmonic injection, which is used in measuring devices, measuring resistance/reactance/impedance, measuring electrical variables, etc. Simple and reliable, improved precision, high precision effect
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[0026] The present invention is described in further detail below in conjunction with accompanying drawing:
[0027] see figure 1 As shown in Figure 3(b), a harmonic injection device for grid harmonic impedance measurement according to the present invention includes a grid voltage feedback circuit, a signal generation circuit, an amplitude amplification circuit, a power amplification circuit and a harmonic current injection interface circuit.
[0028] Grid voltage feedback circuit; composed of a voltage Hall sensor and a sampling circuit, the voltage Hall sensor is used to detect the three-phase voltage signal U of the grid a , U b , U c ; The voltage Hall sensor is connected to the sampling circuit, and the three-phase voltage signal U of the power grid detected by the voltage Hall sensor in real time a , U b , U c After the analog-to-digital conversion and conditioning (filtering) of the sampling circuit, it is sent to the signal generating circuit to calculate the amp...
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