Method for calculating short-circuit current of doubly-fed wind turbine generator

A doubly-fed wind turbine and short-circuit current technology, which is applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as insufficient accuracy of short-circuit current calculation, and achieve the effect of improving accuracy

Pending Publication Date: 2022-06-21
国网山西省电力公司经济技术研究院
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Problems solved by technology

[0004] In view of the above analysis, the embodiment of the present invention aims to provide a method for calculating the short-circuit current of a doubly-fed wind turbine to solve the problem of insufficient calculation accuracy of the short-circuit current of the existing doubly-fed wind turbine

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  • Method for calculating short-circuit current of doubly-fed wind turbine generator
  • Method for calculating short-circuit current of doubly-fed wind turbine generator
  • Method for calculating short-circuit current of doubly-fed wind turbine generator

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[0090] The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

[0091] This embodiment builds a 2WM doubly-fed fan single-machine infinite system simulation model based on RTDS. DFIG parameters are as follows: rated power 2MW, rated frequency 50Hz, stator rated voltage 690V, stator resistance 0.0054pu, rotor resistance 0.00607pu, stator leakage inductance 0.102pu, rotor leakage inductance 0.11pu, mutual inductance 4.362pu, inertia time constant 0.5s, The stator and rotor winding ratio is 0.3. The fan parameters are as follows: the rated power is 2MW, the fan radius is 40m, the rated wind speed is 12m / s, the optimal wind energy utilization coeffic...

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Abstract

The invention discloses a method for calculating short-circuit current of a doubly-fed induction generator in the technical field of wind power generation systems, which comprises the following steps of: establishing a fault equivalent network considering rotor converter control by considering transient regulation and control of a bilateral converter, and respectively deducing a DFIG short-circuit current calculation method when a Crowbar is not accessed and when the Crowbar is accessed. The short-circuit current calculation method comprises the following steps: acquiring the generator terminal voltage drop depth of the doubly-fed fan and unit operation parameters after a fault occurs, establishing a doubly-fed fan fault equivalent network considering the transient regulation and control influence of a rotor converter, calculating stator and rotor short-circuit current in the fault equivalent network, deducing a stator short-circuit current double-frequency component analytic expression, and calculating the fault equivalent network of the doubly-fed fan. And according to the superposition theorem, obtaining a stator and rotor short-circuit total current expression when the Crowbar is not accessed. And then the short-circuit current of the doubly-fed wind turbine generator under the Crowbar access condition is calculated. According to the method, the DFIG short-circuit current when the Crowbar is not accessed and the DFIG short-circuit current after the Crowbar is accessed can be accurately calculated.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a short-circuit current calculation method for a doubly-fed wind turbine. Background technique [0002] With the large-scale connection of doubly-fed wind turbines to the power grid, their fault transient characteristics are different from those of traditional synchronous machines, which pose a certain threat to the safe operation of the power grid. Therefore, it is necessary to deeply study the fault mechanism of DFIG and its impact on protection. [0003] At present, many scholars have carried out certain research on the fault transient characteristics of grid-connected DFIG, and have achieved many results. However, for the case where the Crowbar has not yet acted, most studies only consider the expression of the short-circuit current of the stator and rotor when the rotor protection is not actuated, and do not involve the converter control. state charact...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F113/04G06F113/06
CPCG06F30/20G06F2113/04G06F2113/06
Inventor 史卓鹏王亚臣孟长虹孔祥敏刘丽花李勇李艳张亮红魏佳红郑惠文赵利军王凯凯马静康静雅
Owner 国网山西省电力公司经济技术研究院
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