Chopper protection-based dual-fed wind turbine short circuit current calculation method

A technology of short-circuit current and calculation method, which is applied in the direction of only measuring current, measuring current/voltage, measuring electricity, etc., and can solve problems such as unsatisfactory calculation and analysis

Inactive Publication Date: 2018-11-23
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

However, with the increase of wind power installed capacity, the abov

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  • Chopper protection-based dual-fed wind turbine short circuit current calculation method
  • Chopper protection-based dual-fed wind turbine short circuit current calculation method
  • Chopper protection-based dual-fed wind turbine short circuit current calculation method

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[0060] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

[0061] Such as figure 1As shown, a method for calculating the short-circuit current of a doubly-fed fan based on Chopper protection includes the following steps:

[0062] S1: Use the memory circuit to measure the stator voltage before and after the fault and the initial value of the stator current before the fault;

[0063] S2: Set the number of iterations K=0;

[0064] S3: Obtain ...

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Abstract

The invention relates to the wind power plant safety technical field, and specifically relates to a Chopper protection-based dual-fed wind turbine short circuit current calculation method comprising the following steps: S1, using a memory loop to measure a stator voltage before and after the fault and a stator current initial value before the fault; S2, setting an iteration number K=0; S3, iterating to obtain a stator magnetic link general form, which includes steps of calculating a stator magnetic link steady state component, calculating a stator magnetic link transient state component attenuation and rotation frequency and calculating a stator magnetic link transient state component amplitude; S4, calculating a stator short circuit current; S5, calculating a rotor short circuit current;S6, calculating a rotor loop equivalent variable resistance; S7, determining whether the iteration has converged or not, entering the next step if yes, and enabling K=K+1 and returning to S3 if not; S8, calculating post-reduction three-phase stator current. The method can evaluate contributions of the wind turbine on the system short circuit current under different fault types, can improve the calculation precision, can avoid simulation computing complexity, and thus providing support for field protection setting calculation.

Description

technical field [0001] The invention relates to the technical field of wind farm safety, and more specifically, to a method for calculating the short-circuit current of a doubly-fed wind turbine based on Chopper protection. Background technique [0002] With the extraordinary growth of wind power installed capacity, the impact of large-scale wind power access on the power system cannot be ignored. In the early days of wind power development, the contribution of wind turbines to the system short-circuit current was not considered when calculating the short-circuit current of the power system. However, with the increase of wind power installed capacity, the above-mentioned methods no longer meet the requirements of calculation and analysis. Especially when it comes to power grid equipment selection, calibration and relay protection configuration and setting, higher requirements are put forward for the calculation of short-circuit current, and it has more practical significanc...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R31/02G01R31/34
CPCG01R19/0092G01R31/34G01R31/346G01R31/50
Inventor 张勇贤陈洪胜刘威威李伟强林夙姗曹鹏飞
Owner GUANGDONG POWER GRID CO LTD
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