Experience on the Grid Forming Type-IV Wind Turbine with DC Storage System

Grid forming technology is a promising solution for the stability of high penetrated renewable power system. To enable the grid forming capability on type-IV wind turbine, the DC storage system can be added to the DC-link of the back-to-back converter. In this paper, the grid forming capabilities of this type of wind turbine are demonstrated by control hardware in-the-loop tests. The voltage source behavior, inertia, damping and weak grid adaptability of the grid forming type-IV wind turbine are analyzed. Then a large trial involving an entire wind farm is conducted. To the author’s knowledge, this is the world’s first grid forming wind farm of type-IV wind turbine with DC storage system. The grid forming capability performance of the prototype is analyzed.
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