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Device-level oscillation source location method and device for doubly-fed wind turbine grid-connected system

A technology of double-fed fan and positioning method, which is applied in the direction of generator control circuit, single-network parallel feeding arrangement, electric power measurement by applying digital technology, etc., and can solve problems such as complex correlation and failure to give oscillation transmission path

Active Publication Date: 2020-12-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex relationship between the components of the Doubly Fed Induction Generator (DFIG), the existing methods fail to give the conduction path of the oscillation inside the DFIG

Method used

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  • Device-level oscillation source location method and device for doubly-fed wind turbine grid-connected system
  • Device-level oscillation source location method and device for doubly-fed wind turbine grid-connected system
  • Device-level oscillation source location method and device for doubly-fed wind turbine grid-connected system

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Embodiment 1

[0058] This embodiment discloses a device-level oscillation source location method for a doubly-fed fan grid-connected system.

[0059] Such as figure 1 shown, including the following steps:

[0060] Step S1, establishing an energy-related topological network of each component within DFIG;

[0061] According to the detailed model block diagram of DFIG, such as figure 2 As shown, DFIG is divided into shaft, asynchronous generator, rotor-side converter and its control part (RSC and control), DC bus, grid-side converter and its Six components including the control part (GSC and control), power grid and PLL (grid and PLL);

[0062] established as image 3 The dynamic energy correlation topological network of each component inside DFIG shown; where, the dynamic energy flow W between each component i Including: the dynamic energy flow W output by the shafting part shaft , the dynamic energy flow W of the DC bus part DC Bus , the dynamic energy flow W of the grid-side convert...

Embodiment 2

[0100] This embodiment discloses a device-level oscillation source positioning system for a doubly-fed fan grid-connected system, such as Figure 4 As shown, it includes data acquisition module, DFIG system dynamic energy flow analysis module, device-level oscillation source location module and result output module.

[0101] The data collection module is used to collect the parameters, operation data and operation data of each node of the wind power grid-connected system doubly-fed wind turbine components, and send the collected data to the DFIG system dynamic energy flow analysis module and device-level oscillation source positioning module;

[0102] The dynamic energy flow analysis module of the DFIG system is used to construct the energy-related topological network of each component of the DFIG, and analyze the dynamic energy flow between the components during the oscillation process;

[0103] The device-level oscillation source positioning module is used to calculate the ...

Embodiment 3

[0113] use Figure 5 The real time digital simulation (Real Time Digital Simulator, RTDS) system of IEEE 10 machine 39 nodes including DFIG is used to verify the method of locating the oscillation source. The synchronous generator in the system adopts the classical model. The rated active power of DFIG is 4.5MW, the reactive power is 0.2Mvar, and it is connected to the grid at Bus 39. Its main parameters are as follows: rated voltage is 3.3kV, rated frequency is 60Hz, stator resistance is 0.003p.u., and stator reactance is 0.125p.u. , the rotor resistance is 0.004p.u., the rotor reactance is 0.05p.u., and the moment of inertia is 101.72kg m 2 , the proportional coefficient and integral coefficient of the voltage outer loop analog PI regulator are k vp_g =8,k vi_g =400. The proportional coefficient and integral coefficient of the grid-side converter current inner loop analog PI regulator are k ip_g =0.83,k ii_g =5; the proportional and integral coefficients of the rotor-s...

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Abstract

The invention relates to a device-level oscillation source positioning method and a device for a doubly-fed wind turbine grid-connected system, belonging to the technical field of wind turbines, and solving the problem of stable operation of a wind power grid-connected system at the current stage. topology network; analyze the dynamic energy flow of each component in the energy correlation topology network during the oscillation process; calculate the magnitude of the causal relationship between the dynamic energy flows; construct a DFIG internal oscillation conduction causal relationship diagram; analyze the causal relationship The distribution law of the magnitudes in the relationship diagram determines the oscillation conduction path and locates the oscillation source. The invention can quantitatively describe the mutual influence degree of the dynamic energy flow among the components in the DFIG, and accurately identify the equipment-level oscillation source and the oscillation conduction path.

Description

technical field [0001] The invention relates to the technical field of wind turbines, in particular to a device-level oscillation source positioning method and a device for a doubly-fed wind turbine grid-connected system. Background technique [0002] As a large proportion of high-penetration wind turbines are connected to the grid, the dynamic characteristics of the power system have undergone tremendous changes, which poses a potential threat to the safe operation of the system. Among them, low-frequency oscillation is one of the key bottlenecks restricting wind power grid integration. Timely, accurate determination and rapid adjustment of the equipment and its components and control links that cause oscillations are crucial to suppressing the spread of oscillations and ensuring the stable operation of the system. Therefore, it is imperative to study the equipment-level oscillation source location method of wind power grid-connected units. [0003] Aiming at the problem ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCG01R21/133H02P9/007G06N5/02
Inventor 马静张涌新王瑞峰周晓东
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)