Modelling of Wind Power Plant for Voltage Regulation Simulations

The increasing penetration of renewable energy sources (RES) in networks causes the interest of distribution system operator (DSO) and transmission system operator (TSO) not only in electrical energy generation, but also in a view of voltage regulation possibilities. This article investigates voltage regulation with wind farm or wind power plant (WPP) using two approaches - modelling of each wind turbine (WT) individually and aggregation of all WTs into one. The first approach uses a detailed WPP electrical network with all WTs, cables and transformers modelled. The second approach uses a single WT connected to the WPP site and aggregates all WTs located in the actual WPP. The voltage regulation with both approaches of WPP connected to the real-life Croatian transmission system is simulated in PowerWorld Simulator. Different scenarios of consumption and voltage regulation are used in simulation. It is observed that voltage regulation with WPP is possible and from TSO point of view is negligable which model is used for voltage regulation due to the difference in voltage on the point of common coupling (PCC) being about 0.7%. From owner of WPP point of view there is question about profitability of WPP due to power losses accuring at voltage regulation.