Method and system for suppressing subsynchronous resonance of compensated transmission system

A sub-synchronous resonance and power transmission system technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as system resonance and difficult implementation, and achieve the effects of enhanced control, easy implementation, and reduced calculation amount

Active Publication Date: 2017-05-31
NORTH CHINA ELECTRICAL POWER RES INST +2
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Problems solved by technology

The above suppression method is not easy to realize, and the modulation of active power is easy to cause system resonance, so it is necessary to conduct further research on the suppression measures

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  • Method and system for suppressing subsynchronous resonance of compensated transmission system
  • Method and system for suppressing subsynchronous resonance of compensated transmission system
  • Method and system for suppressing subsynchronous resonance of compensated transmission system

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] In the embodiment of the present invention, the double-fed fan is modeled first, the mathematical model of the two-phase static coordinate αβ axis of the double-fed fan is derived, and the control signal expression in the two-phase static αβ coordinate system is obtained based on the mathematical model. In the embodiment of the present invention, the system structure of the doubly-fed fan in the series compensated power transmission system is generally a...

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Abstract

The invention provides a method and system for suppressing subsynchronous resonance of a compensated transmission system. The method includes: collecting rotor-side three-phase current Irabc, stator-side three-phase current Isabc and stator-side three-phase voltage Usabc of a grid-side converter of a double-feed fan of the compensated transmission system; subjecting Irabc, Usabc and Isabc to Clarke transmission to acquire rotor-side current Irabeta, stator-side current Isabeta and staor-side Usabeta under two-phase stationary coordinates; according to a rotor current reference value Irabeta<*> and Irabeta, acquiring a first feedforward control component; calculating a second feedforward control component according to equivalent reactance parameters, leakage coefficients and Irabeta of the rotator side; according to equivalent reactance parameters of the stator side, common reactance of the stator side and the rotor side and Isabeta and Usabeta, calculating flux control components of the stator side; according to the first feedforward control component, the second feedforward control component and flux control components, calculating control voltage Urabeta<*> of the rotor side; performing space vector modulation on Urabeta<*> to acquire switching control signals of the grid-side converter to suppress the subsynchronous resonance of the compensated transmission system.

Description

technical field [0001] The invention relates to the technical field of wind power grid connection, in particular to a method and system for suppressing subsynchronous resonance of a series compensated power transmission system. Background technique [0002] Large-capacity long-distance transmission is a characteristic of my country's wind power development. Series compensation is an important means to improve transmission capacity and has been widely used in China. The operating characteristics of the cluster wind power sent through the series compensated transmission system are complex, and may face risks such as subsynchronous resonance. The phenomenon of wind power sub-synchronous resonance (SSR) has occurred successively in Texas, the Guyuan area in northern Hebei, and the Tongyu area in Jilin, among which the Guyuan area is the most severe due to the large scale of wind power grid-connected and the large number of resonance occurrences. Typically, the modeling, mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 胡应宏邓春李雨刘辉蔡巍彭珑
Owner NORTH CHINA ELECTRICAL POWER RES INST
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