Transient Characteristics of Two Wind Turbine Generator Systems Having Two Types of Control Methods

Abstract

Wind turbines operate in strong wind conditions, which are generally irregular and unsteady. The previous paper reports a study on two wind turbine generator systems having different types of control methods at a site. It discusses the characteristics of these wind turbines with respect to their control methods by clarifying the relationship between wind parameters and various electric parameters under steady wind conditions. Wind behavior can change drastically, particularly in the transition of output power, for instance when a wind turbine starts up or stops. Therefore, understanding the transient behavior of various electric parameters is beneficial in comprehensively evaluating the performance of a wind turbine generator system. This paper further reports on the same two wind turbine generator systems. Their electric parameters when the output power of the turbines is changed are measured and their performances during their transient state are also discussed.

A Discussion on Prediction of Wind Conditions and Power Generation with the Weibull Distribution

“…Most of them house either synchronous or asynchronous generators: a permanent magnet or a coil excitation type for the former, or a wound-rotor induction or a squirrel-cage induction type for the latter. Wind turbines in Japan must operate under exceptionally nonlinear and unsteady wind conditions, and the generator type to be used in the generator system determines the control of wind turbine power output and of generator revolution speed (1) - (5) . Installation of a wind turbine generator system often involves assessment of its profitability from a wind power business point of view, estimating producible power based * Received 30th November, 2005 Ohta-ku, Tokyo 144-8510 Japan; now Department of Mechanical Engineering, Tokyo National College of Technology, 1220-2 Kunugida-machi, Hachioji-shi, Tokyo 193-0997, Japan.…”

“…This study evaluates wind speed and wind turbine power output in two types of wind turbine generator systems similar to those reported previously (4), (5) : one equipped with a wound-rotor induction generator of variable speed control and the other with a squirrel-cage induction generator of stall control. For systems having the same nominal power output, wind speed and energy pro-duction, along with the change of shape parameter, were evaluated with the Weibull distribution.…”