Abstract
In order to achieve High Voltage Ride Through (HVRT) ability for wind turbines, this paper firstly presents technical requirements of wind turbine HVRT which are formulated in different countries’ grid codes. The high voltage withstand characteristics of critical integration components for Double-Fed Induction Generator Wind Turbine (DFIG-WT) are evaluated systematically. Then, the effect of equivalent impedance on wind turbine terminal voltage is revealed. It’s between the wind turbine and the grid, mainly includes the impedance of set-up transformer and the current limiting branch of the capacitor-based HVRT test equipment. Therefore, a HVRT control strategy based on dynamic reactive power is proposed, which not only reduces the maximum terminal voltage of the wind turbine, but also supports the grid recovery, it can be achieved by software upgrading. The HVRT control loop for DFIG-WT is investigated and designed. Finally, a Bladed and Matlab co-simulation model of DFIG-WT is built, and the dynamic simulation of HVRT process for DFIG-WT is illustrated. A field test is carried out on a 2MW DFIG-WT. The simulation and experiment results demonstrate the theoretical analysis and the proposed control strategy.
Published Version
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