Tomoyuki Fukushima

A determination method of power rating of Energy Storage System for smoothing wind generator output

This paper proposes a system composed of a wind turbine generator system and Energy Storage System (ESS) unit, in which ESS is controlled for smoothing the wind generator output power. A determination of power rating of ESS unit which is sufficient for the smoothing control but as small as possible is very important problem. In this paper, an evaluation method for the determination of the power rating of ESS is presented based on simulation analyses performed by PSCAD/EMTDC.

A new pitch control system of wind turbine to damp power system frequency fluctuations

In this paper a new controller of pitch angle control system for fixed speed wind turbines based wind farm is proposed to smooth output power for damping frequency fluctuation of power system. The control system is designed in such way for the pitch controller to operate based on wind speed and load frequency deviation information. The wind farm is connected to a multi machine power system which is composed of 4 synchronous generators and a static load. Simulation analyses have been carried out to investigate the performance of the controller using real wind speed data. It is shown that the output power from the wind farm can be controlled smoothly damping the load frequency fluctuation effectively.

A new control strategy for smoothing frequency fluctuation due to wind generation

As wind power is a natural energy source varying randomly, output from the wind power generator also fluctuates. Therefore, if the penetration level of wind power generation into the power system increases, a frequency fluctuation appears in the system. In this paper, a novel pitch control strategy for decreasing the output power fluctuation is proposed and its validity is confirmed by simulation analysis using the model system composed of 5 induction generator based fixed speed wind generators, 4 synchronous generator, and a load.

A new method for analyzing frequency and voltage fluctuations of power system with wind generators installed

This paper proposes a new method for evaluating characteristics of frequency and voltage fluctuations of power system in which wind generators are installed. In this paper, a new method based on the transfer function models for frequency response and voltage responses of the power system is developed, from which voltage response of each node in the power system as well as the frequency response can be obtained easily and quickly. Its accuracy is investigated by comparing the results between the proposed method and PSCAD/EMTDC simulations.