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A low-frequency oscillation disturbance source positioning system and method of a double-fed fan grid-connected system

A technology for locating disturbance sources and low-frequency oscillations, which is applied in the fields of reducing/preventing power oscillations, wind power generation, and AC network circuits, etc., and can solve problems such as the lack of research on locating low-frequency oscillation sources, and the unanalyzed role of fan-related control links.

Active Publication Date: 2019-01-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In addition, real-time positioning based on SCADA data, automatic positioning and other new low-frequency oscillation disturbance source positioning methods are also constantly developing, but the current research on low-frequency oscillation disturbance source positioning is still concentrated on the traditional power system. There are very few studies on the localization of oscillation sources and the role of related control links in wind turbines in low-frequency oscillations has not been analyzed, as well as their possible impact on the formation of wind turbine disturbance sources.

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  • A low-frequency oscillation disturbance source positioning system and method of a double-fed fan grid-connected system
  • A low-frequency oscillation disturbance source positioning system and method of a double-fed fan grid-connected system
  • A low-frequency oscillation disturbance source positioning system and method of a double-fed fan grid-connected system

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Embodiment 1

[0138] In this embodiment, the parallel equivalent model of double-fed wind turbines is used to simulate the entire wind farm. Such as image 3 As shown in the system diagram of 10 machines and 39 nodes in New England, the wind farm is composed of 1,000 identical doubly-fed asynchronous wind turbines connected in parallel. Rated output operation; the wind farm first passes through a 0.69 / 20kV on-site transformer, and then connects to busbar 5 through a 20 / 230kV transformer for power transmission, and the rest of the generators are synchronous generators.

[0139] attached Figure 4 is the time-domain graph of the active power of lines 21-22 in this embodiment. Such as Figure 4 As shown, assuming that t=1.5s, an instantaneous small disturbance occurs at the line 21-22, causing the system to oscillate freely, and decays with time, and the oscillation subsides at about 14s.

[0140] attached Figure 5 is the dynamic energy change diagram of each generating set in this embod...

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Abstract

The invention discloses a low-frequency oscillation disturbance source positioning system and a method of a double-fed fan grid-connected system belonging to the technical field of power system stability analysis. The system comprises a sequentially connected information acquisition module, an oscillation source positioning module and an oscillation source position output module. The method comprises acquiring network structure parameters of a grid-connected system of a double-fed fan with virtual inertia control, The dynamic energy model of doubly-fed wind turbine with virtual inertia controlis constructed by injecting bus voltage, generator node current and load node current into the system. The dynamic energy of the components or branches in the oscillation process is obtained, and thepositive and negative and changing trend of the dynamic energy are judged to trace the disturbance source of the low frequency oscillation. A low-frequency oscillation disturbance source position canbe accurately locate by that invention, the function of the fan related control link in the low-frequency oscillation is taken into consideration, and the possible influence on the fan disturbance source is analyze.

Description

technical field [0001] The invention belongs to the technical field of power system stability analysis, and in particular relates to a low-frequency oscillation disturbance source positioning system and method for a double-fed fan grid-connected system. Background technique [0002] After a large proportion of wind power with high penetration rate is connected to the grid, the lack of its own inertia will lead to a weakening of the system's ability to regulate. Especially under the action of disturbance, wind power often exhibits very different behaviors from conventional power generation, which causes qualitative changes in the dynamic characteristics of the power system, poses a potential threat to the safe and stable operation of the system, and restricts the further improvement of wind power penetration. Therefore, in-depth research on the complex dynamic behavior and oscillation mechanism of interconnected systems with high wind power penetration is imperative. [0003...

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/386H02J3/24Y02E10/76
Inventor 马静赵冬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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