Abstract：Recently, grid codes are proposed by many countries all over the world, which require that grid-connected wind turbines should possess fault-ride through capability, This means when the grid fault occurs, such as voltage dip, unbalance, harmonic distortion, frequency drift, phase angle jumping and so on, the wind turbines must be connected with the grid without jumping. In order to investigate the fault-ride through capability of wind generators, a special testing power supply is essential to simulate various grid faults assigned in the grid codes. For this purpose, this paper proposes a new programmable grid-fault emulating power supply, which can emulate almost all kinds of network faults listed in the grid codes. Experimental results validate the simplicity, flexibility and high reliability of the structure and control strategies, which indicate that the types and parameters of the simulated grid faults are adjustable and the functions of the device can be further expanded. It comes out that the programmable fault-emulating power supply can be widely used in the performance test of wind turbines and other electric devices.
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2012, Vol. 27 
