| abstract |
The invention relates to the technical field of power grids, and discloses a voltage sag source positioning method based on positive sequence component phase difference, which comprises the following steps: extracting waveforms of three-phase voltage and three-phase current recorded in a certain voltage sag event from a power grid monitoring device, sampling to obtain data, processing the obtained data through a symmetrical component method to obtain three-phase fundamental frequency positive sequence voltage and three-phase fundamental frequency positive sequence current, calculating a phase difference between the obtained three-phase fundamental frequency positive sequence voltage and the obtained three-phase fundamental frequency positive sequence current, drawing a change curve of the phase difference with respect to time, and according to the drawn curve, if the polarity of a first peak value in the curve is positive, locating a sag source of the voltage sag event upstream of the power grid monitoring device, and if the polarity of the first peak value in the curve is negative, locating the sag source of the voltage sag event downstream of the power grid monitoring device; the method has the characteristics of simplicity and convenience in judgment method, wide applicability and high accuracy. |