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Method and system for judging subsynchronous/super-synchronous oscillation stability of doubly-fed wind power grid-connected system

A double-fed wind power, stability technology, applied in the direction of reducing/preventing power oscillation, wind power generation, electrical components, etc.

Pending Publication Date: 2020-09-11
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0006] The present invention proposes a method and system for judging the sub- / super-synchronous oscillation stability of a doubly-fed wind power grid-connected system to solve the problem of how to determine the sub- / super-synchronous oscillation stability of a doubly-fed wind power grid-connected system

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  • Method and system for judging subsynchronous/super-synchronous oscillation stability of doubly-fed wind power grid-connected system
  • Method and system for judging subsynchronous/super-synchronous oscillation stability of doubly-fed wind power grid-connected system
  • Method and system for judging subsynchronous/super-synchronous oscillation stability of doubly-fed wind power grid-connected system

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[0053] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0054] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a method and a system for judging the subsynchronous / super-synchronous oscillation stability of a doubly-fed wind power grid-connected system. According to the method, a multivariable frequency domain analysis theory is introduced into the field of subsynchronous / super-synchronous oscillation analysis and control of the doubly-fed wind power grid-connected system, and the method has the advantages of being small in calculated amount, short in simulation time, simple and visual in analysis, high in physical significance, easy to control analysis, judgment and processingof the system and the like; the diagonal dominance and the stability of the control system can be visually analyzed, judged and processed by utilizing a Geiger circle belt to draw a graph; besides, onthe basis of ensuring the stability of the multivariable system, control design can be carried out according to a univariate system, and crosslinking is inhibited while the multivariable control system with good performance is designed; the method can be applied to dynamic stability analysis and control of the wind power grid-connected system, the dynamic stability of the wind power grid-connected system is judged, subsynchronous / super-synchronous oscillation is restrained, and the stability of the system is enhanced.

Description

technical field [0001] The present invention relates to the technical field of analysis and control of power system dynamic stability, and more specifically, relates to a method and system for judging the stability of sub- / super-synchronous oscillation of a doubly-fed wind power grid-connected system. Background technique [0002] With the rapid development of new energy and DC transmission systems, the fast control characteristics of large-scale power electronic equipment will greatly change the dynamic characteristics of the system, which will cause the system to oscillate in the sub / super synchronous frequency band. The sub / supersynchronous oscillation problem has a wide range of influence and involves a large number of equipment, seriously affecting the safety and stability of the power system, and is gradually developing in the direction of globalization and complexity, becoming one of the dominant issues that determine the stability of the entire power system. In recen...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J2203/20H02J2300/28Y02E10/76
Inventor 孙华东郭强徐式蕴毕经天赵兵方诗卉
Owner CHINA ELECTRIC POWER RES INST
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