Measuring Method of Instantaneous Value of Phase Angle of Bus Voltage in Substation

Abstract

The invention discloses a method for measuring the instantaneous value of the bus voltage phase angle of a substation. First measure the voltage instantaneous value of the substation bus voltage at each sampling time, calculate the smooth coefficient of the substation bus voltage at each sampling time, calculate the sliding coefficient of the substation bus voltage at each sampling time, and calculate the instantaneous value of the frequency of the substation bus voltage at each sampling time, and then Calculate the instantaneous value of the substation bus voltage phase angle at each sampling time. The measurement accuracy of the method of the present invention is not affected by non-periodic noise signals, the data window is short, the amount of calculation is small, and the calculation speed of the algorithm is fast, and the instantaneous value of the phase angle of the substation bus voltage at each sampling time can be accurately measured in real time, which can be real-time for complex large power grids. Provide a scientific basis for peak shaving and frequency regulation and real-time dispatch of grid power flow.

Description

technical field [0001] The invention relates to the technical field of power system safety and stability control, in particular to a method for measuring the instantaneous value of the phase angle of a substation bus voltage without being affected by aperiodic noise signals. Background technique [0002] The accurate measurement of the bus voltage phase angle of each substation in the power grid can provide a scientific basis for power grid peak regulation and frequency regulation and power flow scheduling. At present, the power industry mainly uses the Fourier algorithm to calculate the phase angle of the substation bus voltage. The premise of this method is that the phase angle of the substation bus voltage remains stable within a 20ms period, and the real part and imaginary part of the substation bus voltage are extracted using a period of data. , and then use the real part and imaginary part of the substation bus voltage to calculate the tangent value corresponding to th...

AI Technical Summary

Problems solved by technology

Due to the limitations of the Fourier algorithm itself, the required data window is one cycle, the required data window is long, the amount of calculation is large, and the calculation speed is slow. The measurement result can only reflect the voltage phase angle of one cycle, and it is impossible to measure the phase angle of each sampling time in real time. Substation bus voltage phase angle

Since the Fourier algorithm cannot filter out the influence of non-periodic noise signals, the measurement accuracy is seriously affected by non-periodic noise signals, and cannot meet the needs of complex large-scale power grid peak regulation and frequency regulation and power flow scheduling

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