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Frequency domain analysis based DFIG (Doubly-fed Induction Generator) crowbar resistance setting constraint computing method

A calculation method and resistance technology, applied in the field of electric drive applications, can solve the problems of unclear resistance setting range, high cost, and long cycle

Active Publication Date: 2016-06-15
NANJING INST OF TECH +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It can be seen that at present, the crowbar resistance setting of doubly-fed generator sets mostly relies on experimental exploration, engineering experience, simulation or approximate calculation methods. The above methods all have high cost, long cycle, unclear resistance setting range, and Difficult to Guarantee the Reliability of the Rotor Converter Bypassed

Method used

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  • Frequency domain analysis based DFIG (Doubly-fed Induction Generator) crowbar resistance setting constraint computing method
  • Frequency domain analysis based DFIG (Doubly-fed Induction Generator) crowbar resistance setting constraint computing method
  • Frequency domain analysis based DFIG (Doubly-fed Induction Generator) crowbar resistance setting constraint computing method

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Embodiment Construction

[0107] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0108] Symbol definition:

[0109] Rotor voltage in stator stationary coordinate system, rotor voltage in rotor rotating coordinate system

[0110] Stator voltage in stator stationary coordinate system

[0111] Stator current in stator stationary coordinate system, rotor current in stator stationary coordinate system

[0112] Stator current in the rotor rotating coordinate system, rotor current in the rotor rotating coordinate system

[0113] Stator flux linkage in stator stationary coordinate system, rotor flux linkage in stator stationary coordinate system

[0114] R s , R r Stator resistance, total resistance of rotor circuit

[0115] R rw , R c Rotor winding resistance, ro...

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Abstract

The invention proposes a frequency domain analysis based DFIG (Doubly-fed Induction Generator) crowbar resistance setting constraint computing method. The solving and superposition of a zero state response and a zero input response of a stator / rotor current after triggering a crowbar circuit are realized in a frequency domain through Laplace transformation. A time domain solution of a stator / rotor transient current is calculated by adopting Laplace inverse transformation. A line voltage upper limit after triggering the crowbar circuit under the condition of different rotational speeds and different crowbar resistance is calculated by analyzing physical characteristics of an analytic expression obtained by solving the stator / rotor current in the frequency domain and the time domain, a constraint condition of a crowbar resistance value is obtained according to the value of the upper limit, and a rotor current transformer is guaranteed to be reliably bypassed during crowbar circuit triggering.

Description

technical field [0001] The invention relates to a DFIG crowbar resistance setting constraint calculation method based on frequency domain analysis, and belongs to the technical field of electric drive applications. Background technique [0002] The crowbar circuit realizes the bypass protection of the rotor converter of the doubly-fed wind turbine (Doubly-fed Induction Generator, DFIG) during the low voltage ride through process. When this protection method is used for control, the rotor converter loses control of the rotor current, and the transient characteristics completely depend on the parameters of the crowbar circuit. A key factor in restoring AC excitation. The analysis of the transient current of the stator and rotor during the triggering of the crowbar circuit is the technical bottleneck to realize the parameter setting. [0003] At present, there are mainly three methods for setting the crowbar resistance of doubly-fed generators: [0004] 1) According to gener...

Claims

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Application Information

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IPC IPC(8): G06F17/50H02J3/38
CPCG06F30/30G06F2111/04H02J3/386Y02E10/76
Inventor 骆皓曹阳郭巍庄俊詹熙曾磊黄灿
Owner NANJING INST OF TECH
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