Representing wind turbine electrical generating systems in fundamental frequency simulations

Abstract

Abstract-Increasing numbers of wind turbines are being erected. In the near future, they may start to influence the dynamics of electrical power systems by interacting with conventional generation equipment and with loads. The impact of wind turbines on the dynamics of electrical power systems therefore becomes an important subject, studied by means of power system dynamics simulations. Various types of power system dynamics simulations exist and the approach depends on the aspect of power system dynamic behavior being investigated.In this paper, the focus is on fundamental frequency simulations, also known as electromechanical transient simulations. In this type of simulation, the network is represented as an impedance matrix and only the fundamental frequency component of voltages and currents is taken into account in order to reduce the computation time. This simulation approach is mainly used for voltage and angle stability investigations. Models of wind turbine generating systems that match the fundamental frequency simulation approach are presented and their responses are compared to measurements.

Kinetic energy from distributed wind farms: Technical potential and implications

“…The wind turbine models selected for this study were chosen because of their wide rotational speed ranges, which were both more than 3:1, as is expected in future machines. Rotor and wind speed ranges are available from product brochures, and a standard C p curve was assumed [9]. The wind speed distributions off offshore sites had Weibull parameters close to c = 10.8,k = 2.2.…”

“…The H value of a wind turbine, ranging from 3-4s [9], is similar to that of large synchronous machines, which changes depending on the units in operation and can range from 2-7s [5]. Suppose a synchronous machine is replaced by a wind farm of equal name-plate capacity.…”

Offshore Wind Energy Conversion System Connected to the Electric Grid: Modeling and Simulation

“…The mechanical power of the wind turbine is given by: (2) where (3) The power coefficient cp is a function of the pitch angle and the tip speed ratio . Normally, numerical approximations are advised, as the one developed in [9] and followed in this paper. The mechanical power in (2) is computed by the mechanical power captured from the wind turbine without dynamic perturbations [8], in (3) associated with three perturbations, namely the asymmetry in the turbine, the vortex tower interaction and the eigenswings in the blades.…”

Dynamic modeling of transverse flux permanent magnet generator for wind turbines

“…Usually, a group of curves are experimentally obtained by the manufacture of the wind turbine. However, for these studies we have used the analytical equation proposed in [2], [11]. The pitch angle control diminishes mechanically the C p of the wind turbine in order to limit the generated power for wind speeds higher than the nominal.…”

“…The pitch angle control diminishes mechanically the C p of the wind turbine in order to limit the generated power for wind speeds higher than the nominal. The adopted pitch angle control operates as electric power regulator [11] and is activated only when the velocity of the wind turbine reaches its nominal value (21,8 rpm).…”