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Method and device for judging stability of onshore doubly-fed wind field through traditional direct-current sending-out system

A system stability and traditional technology, applied in the field of operation stability judgment of onshore doubly-fed wind farms via traditional DC transmission system, can solve the problems of less research on operation stability, achieve accurate and effective model acquisition methods, and clear criteria Effect

Active Publication Date: 2021-01-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

At present, there are relatively few studies on the operation stability of DFIG wind farms via traditional DC transmission systems, and there is no theoretical system for grid-connected stability judgment schemes, and relevant results need further research and analysis.

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  • Method and device for judging stability of onshore doubly-fed wind field through traditional direct-current sending-out system
  • Method and device for judging stability of onshore doubly-fed wind field through traditional direct-current sending-out system
  • Method and device for judging stability of onshore doubly-fed wind field through traditional direct-current sending-out system

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] The present invention provides a method for judging the operation stability of an onshore doubly-fed wind field through a traditional direct current delivery system, the process of which is as follows figure 1 shown.

[0034] Among them, the doubly-fed wind field on land is sent out through the traditional DC system, and its composition is as follows: figure 2 As shown, it consists of doubly-fed wind farm subsystem, traditional DC output subsystem and AC grid; the doubly-fed wind farm subsystem is integrated into the AC grid through the traditional DC output subsystem through the inverter.

[0035] The method for judging the operational stability of a doubly-fed wind farm on land via a traditional direct current transmission system provided by an embodiment of the present invention includes the following steps:

[0036] S1, according to the imped...

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Abstract

The invention discloses a method for judging the operation stability of an onshore doubly-fed wind field through a traditional direct-current sending-out system, which relates to the technical field of renewable energy power generation and transmission, and can realize the operation stability evaluation of the onshore doubly-fed wind field through the traditional direct-current sending-out system.An Nyquist curve of the system is drawn on a complex plane according to the impedance Zwl of the given system and the impedance Zg of the alternating-current power grid; the given system is a traditional direct-current sending-out system for the onshore double-fed wind field; the complex plane is divided into a stable operation feasible region and a stable operation forbidden region according tothe given system stability margin; if the full frequency bands of the Nyquist curve of the given system are in the stable operation feasible region, the given system can be judged to operate stably; and if the Nyquist curve of the given system enters the stable operation forbidden region, an oscillation risk is judged to exist in the given system, so that the given system cannot stably operate atan unstable frequency point, and the unstable frequency point is a frequency point corresponding to the Nyquist curve entering the stable operation forbidden region.

Description

technical field [0001] The invention relates to the technical field of renewable energy power generation and transmission, in particular to a method for judging the operation stability of an onshore doubly-fed wind field through a traditional DC transmission system. Background technique [0002] The rise of wind power-based new energy power generation has changed the traditional energy structure and promoted the low-carbon transformation of the power industry. With the continuous development of the wind power industry, improving wind energy transmission and consumption capacity has become one of the overall requirements of my country's energy strategy. Due to the uneven spatial distribution of wind energy resources and electricity demand in my country, long-distance transmission has become an important way for wind power development. Traditional DC transmission technology has become one of the important ways to solve the problem of wind power transmission by virtue of matur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/36H02J3/38
CPCH02J3/00H02J3/381H02J3/36H02J2203/10H02J2203/20H02J2300/28Y02E60/60
Inventor 杨涛初智广田旭江长明董晓亮李震刘斌
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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