This paper analyses operating characteristic of high temperature superconducting magnetic energy storage (HTS SMES) for frequency stabilization of dispersed power generation system. The wind power generation system (WPGS) fluctuates due to wind speed variation and affects the frequency and voltage fluctuations of the utility. SMES is probably a key technology to overcome these fluctuations. To stabilize power system frequency, a large-scale HTS SMES is connected to the terminal of the WPGS. The authors analysed the load side frequencies using two different configurations of SMES, one consisting of a single magnet and the other of a dual magnet. From the simulation results, it can be concluded that the SMES is a useful device for stabilizing the power system frequency fluctuations, and a dual magnet type SMES is more effective for frequency stabilizing but exhibits more AC loss due to the increased operating current than a single magnet type.

Recently, gearless type generators, which have very low rotation speed and high torque, have been preferred over the geared type due to the problem of the gearbox reliability. In particular, a high-temperature superconducting generator is promising for wind power applications because of its advantages of weight, size, and efficiency. In this paper, a 10-MW class superconducting wind power generator is designed using Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O wires, and the weight of the superconducting generator is estimated. The finite elements method is used to analyze the magnetic field distribution, and the 3-D CAD program is used to calculate the weight of the super-conducting synchronous generator. The designed 10-MW class superconducting generator is analyzed and discussed considering the proper weight. The designed 10-MW superconducting generator will be effectively utilized in the construction of the 10-MW class wind power generation system.

This paper deals with harmonics and reactive power compensation method by grid-connected Photovoltaic (PV) generation system. The experiment is carried out on the proposed single-stage grid-connected PV generation system, and controlled by digital signal processor TMS320F2812. The experimental results include converter operating features either as active power filter or static synchronous compensator (STATCOM), while transferring real power to the grid. The results validate the feasibility of the proposed method.

This paper presents the modeling and analysis of grid-connected wind turbine systems using real time digital simulator (RTDS). The different modeled systems of wind turbine generator systems (WTGS) such as permanent magnet synchronous generator (PMSG), induction generator (IG), synchronous generator (SG) and doubly fed induction generator (DFIG) are simulated. Three control schemes for 3 MW WTGSs of squirrel cage induction generator (SCIG), DFIG with back-to-back converter and PMSG with back-to-back converter are designed for the modeled systems. The simulation results show the performances of each type of WTGS under the same wind speed pattern. It has been verified that the RTDS based realtime simulations of grid-connected wind turbine generator systems to be effectively employed to evaluate the control schemes and output performances of different types of WTGSs.