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Method for correcting synchronous phasor under condition of frequency shift of voltage of power grid, and current signal

A current signal and frequency offset technology, applied in the field of synchrophasor correction, can solve problems such as formula 0/0 type, data drift, etc.

Inactive Publication Date: 2012-07-18
ANHUI UNIV OF SCI & TECH +1
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Problems solved by technology

However, after correctly tracking the grid frequency, no specific plan is given for how to correct the error caused by DFT transformation
Even if a relevant correction plan is proposed, when the correction plan is small, the formula may appear 0 / 0, resulting in data drift

Method used

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  • Method for correcting synchronous phasor under condition of frequency shift of voltage of power grid, and current signal
  • Method for correcting synchronous phasor under condition of frequency shift of voltage of power grid, and current signal
  • Method for correcting synchronous phasor under condition of frequency shift of voltage of power grid, and current signal

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Embodiment Construction

[0079] The method for synchronous phasor correction under the condition of frequency deviation of the voltage and current signals of the power grid, the specific steps are as follows:

[0080] The sinusoidal AC phasor performs Fourier transform to convert the input sampling value into a frequency domain signal: assume that the input voltage or current signal is an ideal sine wave signal, containing only the fundamental component. Let the ideal frequency of the fundamental wave be f 0 =50Hz, the corresponding ideal angular frequency is w 0 , the period is T 0 ; Since the actual frequency of the power system usually fluctuates up and down at 50Hz, the actual frequency of the fundamental wave can be set as f=f 0 +Δf, the corresponding actual angular frequency is w, the period is T, and Δf represents the offset between the actual frequency and the ideal fundamental wave. So the input signal can be expressed as x(t)=U m sin(2πft+α 0 ) = U m sin(2πf 0 t+2πΔft+α 0 )(1)

[00...

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Abstract

The invention discloses a method for correcting a synchronous phasor under the condition of frequency shift of voltage of a power grid, and a current signal. By a uniform approximation method in a fonctionelle, an expression is reasonably corrected, a formula is corrected by the same method in an amplitude-phase space, and a quantized correction expression is finally given. A calculated amount is greatly simplified by an amplitude-phase characteristic relation approximation ellipse. By the uniform approximation method, the correction formula of amplitude is solved, and a practical function expression of engineering is given. Compared with the conventional algorithm, the method mainly solves the problem of 0 / 0 data shift, which is caused by conventional amplitude correction and the problem of sudden change of phase angle, which is caused by discontinuity of a tan function. The research result has certain engineering application value.

Description

technical field [0001] The invention relates to the field of power system analysis and control, in particular to a method for synchronous phasor correction under the condition of frequency deviation of voltage and current signals of a power grid. Background technique [0002] The safety and stability of the power system has always been paid attention to by people. With the rise of the global power market, the safety and stability of the power grid has become increasingly prominent, which has also led to an increase in the frequency and severity of major blackouts around the world in recent years. trend. For this reason, there is an imminent need to use new technical means to strengthen the dynamic security monitoring of the power grid. In recent years, the synchrophasor measurement unit of the wide-area measurement system provides a data source for the analysis and control in the online application of the power system by synchronously collecting the dynamic data of each nod...

Claims

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Application Information

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IPC IPC(8): G01R23/16
Inventor 李梅梁喆高昕高峻岭
Owner ANHUI UNIV OF SCI & TECH
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