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Frequency domain stability judging method and device for new energy grid-connected system oscillation stability

A new energy and stability technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve the problems of high dimension and difficult to quickly quantitatively analyze the oscillation stability characteristics of the system

Active Publication Date: 2018-10-16
TSINGHUA UNIV +1
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Problems solved by technology

However, whether this simplified system model can accurately characterize the oscillation characteristics of the actual complex system deserves further analysis
It is also difficult to deal with the problems of high dimensionality and "black / gray box" of the actual complex system by using these two methods, and it is difficult to quickly and quantitatively analyze the oscillation stability characteristics of the system

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  • Frequency domain stability judging method and device for new energy grid-connected system oscillation stability
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  • Frequency domain stability judging method and device for new energy grid-connected system oscillation stability

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Embodiment Construction

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0037] The following describes the method and device for judging and stabilizing the oscillation stability of the new energy grid-connected system according to the embodiments of the present invention in the frequency domain with reference to the accompanying drawings. First, the oscillation stability of the new energy grid-connected system proposed according to the embodiments of the present invention will be described with reference to the accompanying drawings. frequency-domain stabilization method.

[0038] figure 1 It is a ...

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Abstract

The invention discloses a frequency domain stability judging method and device for new energy grid-connected system oscillation stability. The method comprises the steps that frequency domain impedance models of all devices in a new energy grid-connected system are built; an impedance network model of the new energy grid-connected system is built under a preset dq coordinate system; the impedancenetwork model is merged into a polymeric impedance matrix, the stability of the new energy grid-connected system is judged according to the determinant frequency characteristic of the polymeric impedance matrix, and then the judging result of the stability is obtained; the oscillation mode characteristic of the new energy grid-connected system is quantificationally analyzed according to the determinant frequency characteristic. Accordingly, mutual conversion of impedance matrices of all the devices under different coordinate systems can be achieved, the overall dynamic modeling problem of an actual complex power system is solved, and the system oscillation stability can be analyzed precisely and quantitatively.

Description

technical field [0001] The invention relates to the technical field of power system oscillation stability evaluation, in particular to a method and device for frequency-domain determination of oscillation stability of a new energy grid-connected system. Background technique [0002] In recent years, the installed capacity of new energy typically represented by wind power and photovoltaics has shown explosive growth. Up to now, my country has built a number of large-scale new energy power generation bases, leading to a rapid increase in the penetration rate of new energy in the power grid. In order to improve the ability of new energy power transmission, technical measures such as direct current transmission or fixed series compensation are often adopted. Since new energy units and DC transmission systems are connected to the grid using power electronic converters, the degree of power electronics in modern power systems is increasing day by day. However, the dynamic interac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/38
Inventor 谢小荣刘华坤
Owner TSINGHUA UNIV
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