Double-fed induction wind turbine generator continuous fault ride-through control method

Abstract

The invention discloses a double-fed induction wind turbine generator continuous fault ride-through control method. The method comprises the following steps: calculating a stator flux linkage througha stator three-phase voltage and current signal, calculating a stator flux linkage component psi st_alpha beta, and further obtaining the amplitude thereof so as to obtain kde; obtaining psi st_d andpsi st_q through psi st_alpha beta transformation, and obtaining a rotor de-excitation current instruction value in combination with kde; calculating a rotor reactive current instruction value when the machine end voltage is continuously changed; calculating a rotor current instruction value; and inputting the rotor current instruction value into a rotor side converter current inner loop control link to obtain a control voltage of the rotor side converter: performing space vector modulation on the control voltage to obtain a machine side converter PWM driving signal, thereby realizing the fault ride-through control of a doubly-fed induction wind turbine generator under the condition of the continuous change of a machine end voltage. According to the method, the fault ride-through capability of the doubly-fed induction wind turbine generator under the condition of the continuous change of the machine end voltage can be enhanced, and the continuous fault ride-through of the doubly-fed induction wind turbine generator is realized.

Description

technical field [0001] The invention relates to a continuous fault ride-through control method of a doubly-fed induction wind turbine, in order to enhance the fault ride-through capability of the doubly-fed induction wind turbine under the condition of continuously changing machine terminal voltage, realize the continuous fault ride-through of the doubly-fed induction wind turbine and realize the fault ride-through process of the doubly-fed induction wind turbine The medium output reactive current supports the grid voltage, which belongs to the field of new energy power generation. Background technique [0002] my country's wind energy resources are mostly distributed in the Northeast, Northwest, and North China. The local consumption capacity of wind power in these areas is very limited. Therefore, high-voltage direct current transmission systems are often used to transmit power over long distances to solve the regional inverse nature of wind energy resources and load demand...

AI Technical Summary

Problems solved by technology

[0005] Literature (1) proposes a virtual inductance control strategy, but the proposed control strategy has poor overcurrent suppression ability during high-voltage fault ride-through; Literature (2) introduces the stator transient DC flux linkage during the grid voltage fault into the rotor current reference value to realize fault ride-through control of doubly-fed induction wind turbines

However, when the terminal voltage of the DFIG continuously changes, it is difficult to measure the transient DC flux linkage accurately and quickly, which seriously reduces the fault ride-through capability of the DFIG under the condition of continuous change of the terminal voltage.

In addition, none of the above control strategies considered the fast reactive power support capability of the doubly-fed induction wind turbine during the fault ride-through process.

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