Sub-synchronous resonance monitoring method
A sub-synchronous resonance and sampling value technology, applied in the direction of frequency measurement devices, AC network circuits, electrical components, etc., can solve the problems of complex processing process and large calculation amount, and achieve small calculation amount, protection safety, and eliminate loop parameter conditions Effect
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[0030] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] The sub-synchronous resonance monitoring method is mainly used in the relay protection device of EHV and UHV series compensation system. As an independent functional module, it is integrated in the relay protection device of series compensation system. This function module is always on, and the process is as follows: figure 2 shown. The specific implementation process is:
[0032] 1) Collect the line current in the series compensation system in real time, and perform low-pass filter processing on the line current;
[0033] 2) Sampling the line current after the low-pass filtering process, the sampling refers to extracting 1 sampling value every M sampling values, thereby converting the high sampling rate sampling value into a low sampling rate sampling value, where M >1;
[0034] 3) Perform band-pass filtering on the sampl...
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