Tracking and Identification Method of Power Grid Equivalent Parameters

A technology of parameter tracking and identification and power grid equivalent value, which is applied in the direction of electrical digital data processing, electrical components, circuit devices, etc., can solve the problems of narrow application range and complicated acquisition of transient power data, and achieve the effect of simplifying data measurement

Active Publication Date: 2022-05-03
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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  • Tracking and Identification Method of Power Grid Equivalent Parameters
  • Tracking and Identification Method of Power Grid Equivalent Parameters
  • Tracking and Identification Method of Power Grid Equivalent Parameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] figure 2 The 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 the method step S1 of 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 higher order differential equation k , b kObtain 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 theorem, fo...

Embodiment 2

[0120] Such as image 3 The shown power network is regarded as the power network to be equivalent. According to Norton's theorem, any port power network can be equivalent to a current source shunt reactance model (such as image 3 shown), by image 3 Get the Norton equivalent network differential equation in steady state:

[0121]

[0122] Will Substituting into formula (24), we get:

[0123]

[0124] Compared with formula (19), we can get: A' 0 =1 / R eq , A' 1 =ωC eq , B' 0 =1, B' 1 =0. Equation (12) is transformed into a form consistent with the grid equivalent simple network differential equation (29) by using mathematical transformation, and we get

[0125]

[0126] Then associate 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

[0127]

[0128] According to the voltage an...

Embodiment 3

[0130] 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 plus a capacitance to ground (such as Figure 4 shown), by Figure 4 Obtain the equivalent network differential equation under embodiment 3 steady state:

[0131]

[0132] Will Substituting into formula (32), we get:

[0133]

[0134] Correlating the simplified differential equation (12) with the corresponding coefficients of the equivalent simple network differential equation (33) of the power grid, and solving the equivalent simple network parameters, we get

[0135]

[0136] 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.

...

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Abstract

The invention discloses a method for tracking and identifying equivalent parameters of a power grid, which includes the following steps: S1: extracting the voltage and current signals at the first moment after the disturbance and the voltage and current signals at the second moment after the disturbance from the port of the power network to be equivalent, and calculating Voltage and current transient power data, establish the voltage and current high-order differential equations on both sides of the equivalent power network ports and the voltage and current high-order differential equations of the entire waiting equivalent power network, and solve the coefficients of each high-order differential equation; S2 : From the established high-order differential equations, obtain and simplify the high-order differential equations of voltage and current steady-state electricity on both sides of the equivalent power network port, making it consistent with the equivalent simple network differential equations on both sides of the port, Calculate the equivalent simple network parameters of the power grid according to the coefficients of the high-order differential equation, and realize the tracking and identification of the equivalent parameters of the power grid. This method utilizes the voltage, current and electricity in a power grid operating state to realize the tracking and identification of equivalent parameters of the power grid, which can track the parameter characteristics of the power grid operating state, and can provide an analysis basis for the judgment of static stability and dynamic stability 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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Patent Type & Authority Patents(China)
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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