An analytical method for the three-phase short-circuit current of a doubly-fed fan considering the action time of the crowbar protection
A three-phase short-circuit and crowbar protection technology, which is applied in the direction of motor generator testing, measurement of electricity, and measurement of electrical variables, can solve problems such as complex transient processes
Active Publication Date: 2021-01-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
When the power grid fails, the degree of power grid voltage drop determines the operation mode of DFIG. When the power grid voltage drops deeply and the crowbar (Crowbar) protection is put into operation, the transient state process of DFIG is extremely complicated, and the short-circuit current is compared with the traditional short-circuit current. There is a big difference
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Embodiment 1
[0124] Embodiment 1: This embodiment takes a grid-connected double-fed wind turbine as an example, assuming that a three-phase short-circuit fault occurs in the power grid at 0s, and the Crowbar protection operates at 0.01s. In the dq rotating coordinate system, the terminal voltage at steady state Rotor excitation voltage The voltage drop rate k=0.9, and the specific parameters of the double-fed fan are shown in Table 1:
[0125] Table 1 Parameter setting of doubly-fed induction generator
[0126] parameter Crowbar resistance R c
frequency f Rotor side equivalent resistance R r
Stator equivalent resistance R s
Crowbar resistance R c
Value (pu) 0.032pu 50Hz 0.016 0.023 0.034 parameter Stator leakage inductance L σs
Rotor leakage inductance L σr
Exciting inductance L m
Synchronous speed ω 1
Rotor speed ω 1
Value (pu) 0.18 0.16 2.9 1 1.2
[0127] When a three-phase short-circuit ...
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The invention relates to an analysis method for the three-phase short-circuit current of a doubly fed induction generator considering the action time of crowbar protection, and belongs to the technical field of wind power generation system failure analysis. The method includes establishing a doubly fed induction generator mathematic model, and taking crowbar protection action time as a demarcationpoint; dividing a failure process into two phases, and taking a flux linkage as the bridge of the two phases to perform connection; taking the final value of the rotor flux linkage of the first phaseas the initial value of the rotor flux linkage of the second phase; separately obtaining stator and rotor three-phase short-circuit current analysis formulas of DFIG of the first phase and the statorand rotor three-phase short-circuit current analysis formulas of the DFIG of the second phase; and obtaining the stator and rotor three-phase short-circuit current analysis formulas of the DFIG through combination. The method can accurately calculate the analysis formula of the three-phase short-circuit current of the doubly fed induction generator considering the action time of crowbar protection, and has important meanings for the type selecting and protection action characteristic analyzing of electric power system equipment containing the doubly fed induction generator.
Description
technical field [0001] The invention relates to a method for analyzing the three-phase short-circuit current of a double-fed fan (DFIG) taking into account the protection action time of a crowbar (Crowbar), and belongs to the technical field of failure analysis of wind power generation systems. Background technique [0002] Energy is the foundation of human development. Fossil energy such as coal, oil, and natural gas, as representatives of non-renewable resources, has been consumed for a long time without restraint, and its reserves are getting smaller and smaller. At the same time, the use of a large amount of non-renewable energy has caused a huge impact on the environment. The research and development of renewable new energy such as wind energy, solar energy, and biomass energy has become a very urgent demand. Wind energy is inexhaustible, widely distributed, and rich in content. Compared with traditional energy sources, wind energy has the advantages of being renewable...
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IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 范小红孙士云王杨张雪娟郑新宇
Owner KUNMING UNIV OF SCI & TECH