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A risk assessment method and device for double-fed wind farm subsynchronous oscillation

A subsynchronous oscillation, doubly-fed wind farm technology, applied in circuit devices, wind power generation, electrical components, etc., can solve problems such as low efficiency and large computational workload.

Active Publication Date: 2022-04-15
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] This application provides a method for assessing the subsynchronous oscillation risk of double-fed wind farms, which solves the problems of large computational workload and low efficiency in the existing assessment method of multiple double-fed wind farms connected to the grid through series capacitance compensation.

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  • A risk assessment method and device for double-fed wind farm subsynchronous oscillation
  • A risk assessment method and device for double-fed wind farm subsynchronous oscillation
  • A risk assessment method and device for double-fed wind farm subsynchronous oscillation

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Embodiment Construction

[0036] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar promotions without violating the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

[0037] Please see figure 1 , figure 1 It is a flow chart diagram of a method for assessing subsynchronous oscillation risks of doubly-fed wind farms provided by the embodiment of this application. The following combines figure 1 The method provided in the embodiment of the present application will be described in detail.

[0038] Step S101, establishing an admittance matrix of grid nodes without DFIG.

[0039] There is an interaction between the double-fed wind turbine and the series compensation capacitor, which ...

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Abstract

The invention discloses a method for assessing the risk of double-fed wind farm secondary synchronous oscillation, which is characterized in that it includes: establishing the grid node admittance matrix without double-fed wind farm; calculating the equivalent input of each double-fed wind farm access node Impedance; according to the equivalent input impedance, calculate the equivalent series compensation degree of each doubly-fed wind farm access node; according to the equivalent series compensation degree, determine whether each wind farm has a sub-synchronous oscillation risk, and complete the power grid sub-synchronization Oscillation risk assessment. It solves the problem of large computational workload and low efficiency in the existing evaluation method of subsynchronous oscillation risk of multiple doubly-fed wind farms connected to the grid through series capacitor compensation.

Description

technical field [0001] This application relates to the field of power grid risk assessment, in particular to a method for assessing the risk of subsynchronous oscillation of a doubly-fed wind power plant, and at the same time relates to an assessment device for the risk of sub-synchronous oscillation of a doubly-fed wind power plant. Background technique [0002] There is an interaction between the double-fed wind turbine and the series compensation capacitor, which may form an unstable subsynchronous oscillation phenomenon, and the oscillation frequency is usually around 6-8Hz. The current research results suggest that the oscillation mechanism lies in the subsynchronous control interaction (Subsynchronous control interaction, SSCI) between the converter on the rotor side of the wind turbine and the series compensation system. The rotor side of the doubly-fed wind turbine contains a fast-controlled frequency converter. If the control parameters of the frequency converter ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/386H02J3/00H02J2203/20Y02E10/76
Inventor 周佩朋项祖涛陈春萌宋瑞华李延和郑彬高宝荣姜红利
Owner CHINA ELECTRIC POWER RES INST