Adaptive software and hardware frequency tracking and sampling method
A frequency tracking, software and hardware technology, applied in the field of distribution network, can solve the problems of measurement value deviation and inability to adjust flexibly, and achieve the effect of reducing error, improving accuracy, and improving calculation accuracy
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[0026] refer to figure 1 As shown in the flow chart of the method of the present invention, after the signal to be tested is processed, the hardware frequency measurement circuit and software frequency measurement are used to measure the frequency of the signal to be tested, and the sampling timer adjusts the sampling period in real time according to the frequency measurement value. The specific process includes the following step:
[0027] (1) When the power distribution terminal is powered on, the sampling period of the sampling timer is set to 50HZ as the initial value, and at the same time, the hardware frequency measurement circuit and software frequency measurement function perform signal frequency measurement on the signal to be tested;
[0028] (2) Carry out frequency tracking, collect frequency measurement value f1 of hardware frequency measurement circuit, frequency measurement value f2 of software frequency measurement and signal amplitude V;
[0029] (3) If V is g...
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