Analysis method and device of influence of direct drive fans on subsynchronous resonance of power transmission system

A technology of subsynchronous resonance and power transmission system, applied in the field of electric power, can solve the problems of deteriorating system damping, subsynchronous resonance of wind power system, increasing resonance risk, etc., and achieve the effect of avoiding system damping

CN106849161AActive Publication Date: 2017-06-13ZHANGJIAKOU POWER SUPPLY COMPANY OF STATE GRID JINBEI ELECTRIC POWER COMPANY +3
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-06-13

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Abstract

Provided is an analysis method and device of influence of direct drive fans on subsynchronous resonance of a power transmission system. The method comprises the steps of conducting equivalence on a series compensation power transmission system to obtain an equivalent parameters; building a simulation system according to single direct drive fan and a power transmission system equivalent model, obtaining a direct drive fan impedance characteristic of the direct drive fan in a subsynchronous frequency band through frequency scanning, and obtaining a double-fed fan impedance characteristic of a double-fed fan in the subsynchronous frequency band; performing calculating to obtain a mixed fan impedance characteristic after multiple double-fed fans and multiple direct drive fans are connected in parallel and a single fan impedance characteristic after the multiple double-fed fans are connected in parallel according to the direct drive fan impedance characteristic, the double-fed fan impedance characteristic and matching of the double-fed fans and the direct drive fans; judging subsynchronous resonance influence condition of the direct drive fans to the double-fed fan series compensation power transmission system under the matching by comparing the mixed fan impedance characteristic with single fan impedance characteristic. According to the analysis method and device of influence of the direct drive fans on the subsynchronous resonance of the power transmission system, subsynchronous resonance influence of the direct drive fans can be effectively analyzed.
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Description

technical field

[0001] The invention relates to the field of electric power technology, in particular to an analysis method and device for the influence of a direct drive fan on the subsynchronous resonance of a power transmission system. Background technique

[0002] Wind power has become an important component of China's energy strategy, but most of China's wind power is concentrated in Xinjiang, Gansu, Inner Mongolia and other northwest regions, while energy load centers are concentrated in southeast coastal areas. Therefore, high voltage, large The capacity of the transmission mode realizes "West-to-East power transmission". New transmission lines will bring problems such as project cost and transmission corridor occupancy, so it is of great significance to improve the transmission capacity of existing AC lines.

[0003] Adding series compensation capacitors in the transmission line can reduce the line reactance and improve the static stability limit and transmission ca...

Examples

Embodiment Construction

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0038] figure 1 It is a schematic flowchart of an analysis method for the influence of a direct drive fan on the subsynchronous resonance of a power transmission system according to an embodiment of the present invention. Such as figure 1 As shown, the method for analyzing the impact of the direct drive fan on the subsynchronous resonance of the power transmission system in this embodiment may include steps:

[0039] S110: Equivalenting the series compensated power transmission system to obtain equivalent parameters of the series compensated power transmission syste...