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Sod‑lms-based stability discrimination method for large-scale multi-delay power systems

A technology of power system and discrimination method, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as large amount of calculation and long calculation time, and achieve the effect of high calculation efficiency, fast calculation speed, and guaranteed accuracy

Active Publication Date: 2017-10-03
SHANDONG UNIV
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Problems solved by technology

However, this method needs to find the inverse of the discretized sub-matrix when calculating some key eigenvalues, which requires a large amount of calculation and a long calculation time

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  • Sod‑lms-based stability discrimination method for large-scale multi-delay power systems
  • Sod‑lms-based stability discrimination method for large-scale multi-delay power systems
  • Sod‑lms-based stability discrimination method for large-scale multi-delay power systems

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Embodiment Construction

[0049] The present invention is described in detail below in conjunction with accompanying drawing:

[0050] Such as figure 1 Shown: The time-delay link is introduced in the modeling process of the actual large-scale power system. The time-delay power system includes four parts: time-delay-free power system, wide-area feedback time-delay, wide-area damping controller and wide-area output time-delay. The connection relationship between each part is shown in the figure. figure 1 middle, y f is the output of the time-delay-free power system, y df To account for the wide-area feedback signal with feedback lag and as input to the damping controller, y c is the output of the wide-area damping controller, y dc The output of the wide-area damping controller to consider the output time lag is also used as the control input of the time-delay-free power system.

[0051] The eigenvalues ​​of the time-delay system in Figure 2(a) located on the left half of the complex plane are mapped...

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Abstract

The invention discloses a large-scale multi-time-lag power system stability judgment method based on SOD-LMS (Solution Operator Discretization-Linear MultiStep). The method comprises the following steps: establishing a time-lag power system model; converting an characteristic value problem of the time-lag power system during solving into a spectrum problem of a solved operator T(h) according to the mapping relation between a time-lag power system characteristic value and an operator characteristic value; carrying out discretization on the operator T(h) by using a linear multistep method, and reasonably selecting a transfer step length h to obtain a discretization matrix TN capable of accurately judging the stability of the time-lag power system; calculating a set number of characteristic values with the maximum modulus value of the discretization matrix TN by using a sequential method or a space method (such as an implicit restarted Arnoldi algorithm); and converting the characteristic value of the discretization matrix TN into the characteristic value when the time-lag power system is positioned on the rightmost side of a complex plane according to the mapping relation of the spectrum for judging the small-interference stability of a large-scale multi-time-lag power system. When the SOD-LMS method provided by the invention is used for calculating the key characteristic value of a real system and the stability of a judgment system, the scale of the real system and the influence of communication time-lag are fully taken into account.

Description

technical field [0001] The present invention relates to the field of power system stability analysis, in particular to a large-scale multi-delay power system stability discrimination method based on SOD-LMS, SOD-LMS is the abbreviation of "Solution Operator Discretization-LinearMultiStep", Chinese meaning: solution operator Linear multistep discretization. Background technique [0002] With the continuous growth of energy and power demand, the establishment of large-scale inter-regional and transnational interconnected power grids is a new stage of power development since the 21st century. However, in the initial stage of interconnection, complex electrical structures and weak transmission links make interconnected grids more prone to inter-regional low-frequency oscillations. Compared with local oscillations, interval oscillations involve a wide range, and the electrical connection between the clusters participating in the oscillations is very complicated, which has a more...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06Q50/06
CPCG06Q50/06H02J3/00H02J2203/20
Inventor 叶华王燕燕刘玉田王亮慈文斌李莉刘晓明
Owner SHANDONG UNIV
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