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

A technology of voltage instantaneous value and bus voltage, which is applied to the phase angle between voltage and current, measuring devices, measuring electric variables, etc. Data window length and other issues

Active Publication Date: 2016-09-14
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +3
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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 ...

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

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Embodiment Construction

[0019] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0020] Fig. 1 is a schematic diagram of a double-terminal power transmission system applying the present invention. PT in Fig. 1 is the substation bus voltage transformer.

[0021] The method for measuring the instantaneous value of the phase angle of the busbar voltage in a substation comprises the following steps:

[0022] (1) The voltage phase angle instantaneous value measuring device measures the voltage instantaneous value at each sampling time of the substation bus voltage in real time.

[0023] (2) The voltage phase angle instantaneous value measuring device calculates the stability coefficient of the substation bus voltage at the sampling time t

[0024] [ u ( t ) ] 2 - ...

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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...

Claims

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Application Information

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IPC IPC(8): G01R25/00G06F19/00
Inventor 曾惠敏林富洪
Owner STATE GRID PUTIAN ELECTRIC POWER SUPPLY
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