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Three-phase short-circuit double-fed generator simulation method and system

A doubly-fed generator and simulation method technology, applied in the direction of motor generator testing, etc., can solve the problem of not considering the influence of converter transient control on short-circuit current calculation, etc.

Active Publication Date: 2015-07-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] In order to solve the problem that the existing simulation system does not consider the influence of converter transient regulation on short-circuit current calculation in describing the transient process of DFIG, the present invention proposes a DFIG simulation method under three-phase short circuit and its system

Method used

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  • Three-phase short-circuit double-fed generator simulation method and system
  • Three-phase short-circuit double-fed generator simulation method and system
  • Three-phase short-circuit double-fed generator simulation method and system

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Embodiment Construction

[0067] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0068] figure 1 A structural diagram of a doubly-fed generator simulation system under a three-phase short circuit provided by the present invention. The simulation system includes a fault data acquisition module, a fault equivalent network calculation module, a DC bus voltage calculation module, a stator and rotor current double frequency component calculation module, and a fault current output module.

[0069] The simulation methods include:

[0070] Step 1. Collect the terminal voltage drop rate and unit operating parameters at the time of the fault. The unit operating parameters include: steady-state stator voltage, stator flux linkage amplitude, unit active and reactive output reference value, slip rate, rotor current reference Value variation, rotor speed;

[0071] Step 2. Establish the fault equivalent network of the doubly-fed generator, including: nor...

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Abstract

The invention belongs to the technical field of wind power generation systems, in particular to a three-phase short-circuit double-fed generator simulation method and system. The method includes firstly acquiring the voltage dropping rate and unit operation parameters during a failure, and establishing a double-fed generator failure equivalent network; calculating the normal network component, mandatory component, transient direct-current component and transient natural component of the rotor current; calculating the direct current bus voltage fluctuation according to converter vector control strategy and converter power switching process; calculating the harmonic component of the stator short-circuit current doubled frequency according to the network-side converter bicyclic transient regulating process through quantitative description; finally, acquiring a rotor-stator short circuit total current expression by the stacking principle, and reproducing the failure current change rules within time on the three-phase short-circuit conditions. The problem that according to an existing simulation system, in the double-fed generator transient describing process, the influence on the short-circuit current calculation by converter transient regulation is not considered is solved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation systems, and in particular relates to a simulation method of a doubly-fed generator under a three-phase short circuit and a system thereof. Background technique [0002] Doubly-fed induction generator (DFIG) is currently the most widely used wind turbine in the field of wind power. It has the advantages of small inverter capacity, independent decoupling control of active and reactive power, etc. However, when the external power grid fails, the overcurrent and overvoltage generated by DFIG will seriously endanger the normal operation of the generator and converter. Therefore, studying the short-circuit characteristics of DFIG is of great significance for establishing corresponding protection schemes. [0003] When a short circuit occurs in the power grid, the double-fed wind turbine will experience the coupling process of the electromagnetic transient state of the motor and the contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 马静黄天意丁秀香康胜阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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