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Power grid equivalent parameter tracking identification method

A technology for parameter tracking and identification, grid equivalence, applied in electrical digital data processing, electrical components, circuit devices, etc., can solve problems such as narrow application scope and complex transient power data acquisition.

Active Publication Date: 2020-10-30
CHONGQING UNIV +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing power grid equivalent parameter identification based on transient power must collect power measurement data before and after the disturbance, and can only be established under the assumption that the power grid parameters before and after the disturbance are unchanged, resulting in Existing methods have a narrow scope of application, and the acquisition of transient power data is more complicated

Method used

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  • Power grid equivalent parameter tracking identification method
  • Power grid equivalent parameter tracking identification method
  • Power grid equivalent parameter tracking identification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] figure 2The shown power network is used as the power network to be equivalent, and the high-order differential equation of the voltage and current transient power of the power network to be equal is obtained through step S1 of the method described in the present invention, and the derivatives of each order of the transient power are obtained by numerical methods Δu(t) (k) , Δi(t) (k) , using the least squares method to solve the coefficient a of the high-order differential equation k , b k Obtain the high-order differential equation of the voltage and current steady-state power on both sides of the equivalent power network port through the method step S2 of the present invention, simplify the high-order differential equation of the voltage and current steady-state power on both sides of the equivalent power network port, From the formula (12) in S21, the four parameters A in the steady state can be obtained 0 、A 1 , B 0 , B 1 .

[0111] According to Thevenin's ...

Embodiment 2

[0121] Such as image 3 The power network shown is regarded as the power network to be equivalent, and it can be seen from Norton's theorem that any port power network can be equivalent to a model of a current source shunt reactance (such as image 3 shown), by image 3 Get the Norton equivalent network differential equation in steady state:

[0122]

[0123] Will Substituting into formula (24), we get:

[0124]

[0125] Compared with formula (19), we can get: A' 0 =1 / R eq , A' 1 =ωC eq , B' 0 =1, B' 1 =0. Formula (12) is converted into a form consistent with the grid equivalent simple network differential equation (29) by mathematical transformation, and

[0126]

[0127] Then correlate the simplified high-order differential equation (30) with the corresponding coefficients of the equivalent simple network differential equation (29) of the power grid, and solve the equivalent simple network parameters to obtain

[0128]

[0129] According to the voltag...

Embodiment 3

[0131] Such as Figure 4 The power network shown is used as the power network to be equivalent. In the actual power grid equivalent method, a complex system is also equivalent to a model of a resistor in series with an inductance and a capacitance to ground (such as Figure 4 shown), by Figure 4 Obtain the equivalent network differential equation under embodiment 3 steady state:

[0132]

[0133] Will Substituting into formula (32), we get:

[0134]

[0135] Correlate the simplified differential equation (12) with the corresponding coefficients of the equivalent simple network differential equation (33) of the power grid, and solve the equivalent simple network parameters to obtain

[0136]

[0137] According to the voltage and current values ​​measured at the ports of the power network, the equivalent power supply of Example 3 can be obtained by using formula (33) Complete the tracking and identification of the equivalent network parameters in Example 3.

[0...

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Abstract

The invention discloses a power grid equivalent parameter tracking identification method. The method comprises the steps of S1, extracting voltage and current signals at a first moment after disturbance and voltage and current signals at a second moment after disturbance from a to-be-equalized power network port, calculating voltage and current transient electric quantity data, establishing voltage and current high-order differential equations on the two sides of the to-be-equalized power network port and a voltage and current high-order differential equation of the whole to-be-equalized powernetwork, and solving coefficients of all the high-order differential equations; S2, obtaining and simplifying voltage and current steady-state electric quantity high-order differential equations on the two sides of the to-be-equalized power network port from the established high-order differential equations, enabling the voltage and current steady-state electric quantity high-order differential equations to be consistent with the equivalent simple network differential equations of the power grid on the two sides of the port in form, and calculating the equivalent simple network parameters ofthe power grid according to the coefficients of the high-order differential equations, thereby realizing tracking identification of the equivalent parameters of the power grid. According to the method, tracking identification of equivalent parameters of the power grid is realized by utilizing voltage, current and electric quantity in a power grid operation state, parameter characteristics of the power grid operation state can be tracked, and an analysis basis can be provided for static stability and dynamic stability judgment of the power grid.

Description

technical field [0001] The invention relates to the field of power grid analysis and operation, in particular to a method for tracking and identifying equivalent parameters of a power grid. Background technique [0002] The real-time tracking and online analysis of power grid operation status are necessary in the analysis of power grid security and stability, and the discovery of security weak links. With the continuous expansion of the grid interconnection scale, the grid structure becomes more and more complex, and the real-time tracking and online analysis of the grid status become more and more difficult. The online analysis and calculation of the existing complex grid is usually completed on the basis of grid simplification. The grid equivalent method is the main means of grid simplification. The accuracy of grid equivalent depends on the effectiveness of the parameter identification method in the grid equivalent model. [0003] The existing grid equivalent model para...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F30/367
CPCH02J3/00
Inventor 罗建张林冯波徐瑞林肖俊赵宏伟贾勇陈涛袁炜灯陈佳辉钟加勇
Owner CHONGQING UNIV
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