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Double-fed wind turbine stator current calculation method with low penetration capacity

A technology of stator current and calculation method, applied in the direction of control of generator, motor generator control, electronically commutated motor control, etc.

Inactive Publication Date: 2015-06-24
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the protection devices installed on the transmission lines of wind farms have experienced many malfunctions and refusals. This situation shows that various protection devices designed based on the analysis results of traditional synchronous machines cannot be well adapted to new energy sources. Therefore, it is necessary to conduct an in-depth analysis of the transient characteristics of the doubly-fed wind turbine

Method used

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  • Double-fed wind turbine stator current calculation method with low penetration capacity
  • Double-fed wind turbine stator current calculation method with low penetration capacity
  • Double-fed wind turbine stator current calculation method with low penetration capacity

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0043] figure 2 Shown is the structural diagram of the doubly-fed wind turbine access system. The system parameters are as follows:

[0044]Double-fed fan: rated capacity 1.5MW, rated voltage 690V, rated frequency 50Hz; stator-rotor turns ratio 0.3663, stator impedance Rs+jXs=0.011+j0.1 rotor impedance Rr+jXr=0.009+j0.144, stator-rotor mutual inductance Xm = 5.896; moment of inertia time constant TJ = 3.6s. All resistances and reactances are per unit values ​​based on the rated value of the unit itself. crowbar resistor. Rated wind speed 10m / s. Steady-state operation of the wind turbine: the wind speed is 12m / s, and the wind turbine operates at a speed of 1.2pu.

[0045] The equivalent power supply on the system side is an ideal power supply.

[0046] Connection impedance: RL=0.0001pu, XL=0.001pu.

[0047] Such as figure 1 Shown, the...

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Abstract

The invention relates to a double-fed wind turbine stator current calculation method with the low penetration capacity. The method includes the steps that flux linkages of a stator and a rotor of a double-fed wind turbine are firstly calculated according to the running work condition of the double-fed wind turbine in the normal running steady state; then a power frequency component of the stator current is calculated through a sequence network equivalent circuit under the fault condition; flux linkage values of the stator and the rotor of the double-fed wind turbine under the fault steady-state condition are obtained through the adoption of calculation results of power frequency loops; the flux linkage values of the stator and the rotor in the normal steady state and the fault steady state are substituted into a controlled source expression of a rotating frequency current, and a rotating frequency component is calculated; finally, the power frequency component, the rotating frequency component and an attenuation alternating component of the stator current are added to obtain a final stator current analysis calculation result. By means of the double-fed wind turbine stator current calculation method, an analytical solution of the stator end current of the double-fed wind turbine can be given, trouble caused by a large amount of slow simulation calculation through a simulation platform is avoided accordingly, and on-site protection setting work is better done.

Description

technical field [0001] The invention relates to the technical field of power system short-circuit calculation, in particular to a method for calculating the stator current of a doubly-fed wind generator with low wear-through capability. Background technique [0002] The grid connection of new energy (including intermittent energy) brings challenges to the operation of the power system as well as the traditional power system theory, method and technical system. The short-circuit current provided by the new energy power generation device in the weakly interconnected regional power grid containing new energy may exceed the short-circuit current provided by the system side. When performing grid equipment selection, verification, and relay protection configuration and adjustment, new energy power generation must be considered. device impact. At present, the protection devices installed on the transmission line of the wind farm have experienced many malfunctions and refusals. Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 郝治国王小立张金华陈琳浩温靖华罗美玲张保会
Owner XI AN JIAOTONG UNIV
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