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A regional dynamic equivalence method of power system based on wide-area measurement information

A power system, wide-area measurement technology, applied in the field of value, can solve the problems of inability to exchange real-time data quickly, and the difficulty of dynamic equivalence in the power system area, so as to save manpower and improve efficiency.

Active Publication Date: 2021-10-12
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the development of the economy and the reform of the power market, each power company strengthens the confidentiality of the data of the power grid in the region, and the fast and real-time data exchange between the interconnected subsystems cannot be carried out. value poses great difficulty

Method used

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  • A regional dynamic equivalence method of power system based on wide-area measurement information
  • A regional dynamic equivalence method of power system based on wide-area measurement information
  • A regional dynamic equivalence method of power system based on wide-area measurement information

Examples

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Embodiment 1

[0037] An embodiment of the present invention provides a method for regional dynamic equivalence of power systems based on wide-area measurement information, see Figure 1-Figure 3 , the method includes the following steps:

[0038] 101: The synchrophasor measurement unit PMU collects the terminal voltage of the generator (V T , θ) signal, the power generated by the generator (P E , Q E ) signal, the internal potential E is established according to the phasor diagram of the classical second-order generator model q with transient reactance x d ’, and then eliminate the internal potential E in the relation q Solving for the transient reactance x d ';

[0039] Among them, the classical second-order generator model [1] It is well known to those skilled in the art, and will not be described in detail in this embodiment of the present invention.

[0040] above, V T is the phase angle amplitude of the equivalent generator terminal voltage; θ is the phase angle of the equival...

Embodiment 2

[0047] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0048] 201: Divide the power system into two subsystems, the research area and the external area, determine the number of boundary buses of the two subsystems, and at each boundary bus, the external area subsystem is equivalent to a classical second-order generator model; from In the wide-area measurement system (a technical term well known to those skilled in the art, which will not be described here), the active power P at the connecting bus between the power system research area and the external area is obtained E and reactive power Q E Information, the voltage amplitude of the boundary bus V T and phase angle θ signal;

[0049] Wherein, the wide-area measurement system is a technical term known to those skilled in the art, which will not be described in detail in this embodiment of the present invention...

Embodiment 3

[0107] The following combined with specific examples, Figure 4-Figure 8 , and table 1, table 2 carry out feasibility verification to the scheme in embodiment 1 and 2, see the following description for details:

[0108] This example takes the regional dynamic equivalent of a 16-machine 68-node system as an example to verify the effectiveness of this method. The 16-machine 68-node test system is as follows: Figure 4 shown.

[0109] Divide the 68-node system into two subsystems, the area 1 is reserved for the research system, and the area 2 is for the external system. Apply this method to build a regional dynamic equivalent model. The topology of the equivalent system is as follows: Figure 5 shown. Set up bus 1, bus 8, and bus 68 to install PMU1, PMU2, and PMU3 respectively. The PMU at the boundary bus collects the voltage amplitude V B , phase angle θ B , the active power P flowing through the connection line between area 1 and area 2 L,联络线 and reactive power Q L,联络线 ;...

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Abstract

The invention discloses a regional dynamic equivalence method of a power system based on wide-area measurement information. The method includes the following steps: a synchronized phasor measurement unit collects a generator terminal voltage signal and a power signal sent by the generator, and according to The phasor diagram of the classic second-order generator model establishes the relationship between the internal potential and the transient reactance; based on the regional equivalent generator phasor relationship of the classic second-order generator model, the transient reactance is obtained by least squares curve fitting According to the estimation result, the internal potential is calculated according to the relationship between the internal potential and the transient reactance and the state of the area equivalent generator power angle is estimated; the state estimation result of the area equivalent generator power angle is compared with the generator active power measured by the PMU The output is used as the input quantity, and the least squares identification method is used to identify the inertial time constant and mechanical power output of the area equivalent generator. The invention notably improves the efficiency of the research on the dynamic stability of the power system while ensuring the accuracy of the dynamic process in the research area.

Description

technical field [0001] The invention relates to the field of dynamic equivalence of power systems, in particular to a regional dynamic equivalent method of power systems based on wide-area measurement information. Background technique [0002] With the rapid development of my country's economy, various power systems are rapidly developing towards multi-machine, large power grid, AC-DC joint transmission and large-scale interconnected operation, which makes the dynamic analysis of the power system very difficult even in offline conditions; when using a computer for analysis , its memory, data preparation and analysis of calculation results are also difficult. Therefore, it is of great practical significance to study the regional dynamic equivalent method of power system to improve the efficiency of power system simulation. [0003] Traditionally, the regional equivalence method of power system is based on the idea of ​​generator coherence, and realizes the dynamic equivalence...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20Y02E40/70Y02E60/00Y04S10/22
Inventor 陈厚合姜涛王为超李国庆辛业春张嵩李雪李晓辉
Owner NORTHEAST DIANLI UNIVERSITY
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