Coordinated Frequency Control Using MT-HVDC Grids With Wind Power Plants

In the last years, wind power has continuously increased the participation in the power generation share. For transmitting the power generated from wind power plants (WPPs) to AC grids, multiterminal high-voltage direct current (HVDC) systems are envisaged as the future backbone of a European SuperGrid interconnecting wind power generation with various AC grids and countries. This paper presents a coordinated control scheme in order that offshore WPPs connected through multiterminal HVDC systems are able to contribute to the primary frequency control of the land AC grids. The proposed control scheme is capable of achieving a suitable frequency regulation even under low wind power conditions by allowing also the power share among AC areas. The control scheme is evaluated by dynamic simulations in an adapted version of the Cigre DC grid benchmark with a five-terminal HVDC grid including two wind farms and three AC networks.