A method and system for fault traverse control of a doubly fed wind turbine generator system
A doubly-fed wind turbine and fault ride-through technology, applied in the electric power field, can solve the problem of increasing the coupling between active and reactive power control loops of wind turbines, destroying the dq-axis power decoupling control conditions, affecting the accuracy of phase-locking control of wind turbines, etc. problem to improve accuracy
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Embodiment 1
[0048] The flow chart of a doubly-fed wind turbine fault ride-through control method provided by the present invention is as follows figure 1 shown, including:
[0049] Step 1: Collect the terminal voltage of the doubly-fed wind turbine;
[0050] Step 2: Determine whether the doubly-fed wind turbine enters the preset fault ride-through control mode or enters the normal control mode according to the terminal voltage and the preset threshold;
[0051] The fault ride-through control mode includes determining the rotor control voltage of the doubly-fed wind turbine according to the phase jump value of the terminal voltage.
[0052] Specifically, the fault ride-through control method of DFIG is as follows: figure 2 shown, including:
[0053] Step 101, designing a DFIG rotor voltage direct compensation fault ride-through control strategy based on the voltage phase jump value, including:
[0054] The DFIG determines which control mode to adopt based on the terminal voltage state. ...
Embodiment 2
[0076] Based on the same inventive concept, the present invention also provides a doubly-fed wind turbine fault ride-through control system. Since the principle of these devices to solve technical problems is similar to the doubly-fed wind turbine fault ride-through control method, the repetition will not be repeated.
[0077] The basic structure of the system is as Figure 4 As shown, including: a voltage acquisition module and a control mode determination module;
[0078] Among them, the voltage acquisition module is used to acquire the terminal voltage of the doubly-fed wind turbine;
[0079] The control mode determination module is used to determine whether the doubly-fed wind turbine enters the preset fault ride-through control mode or enters the normal control mode according to the terminal voltage and the preset threshold;
[0080] The fault ride-through control mode includes determining the rotor control voltage of the doubly-fed wind turbine according to the phase ju...
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