The use of distributed energy resources is increasingly being pursued as a supplement and an alternative to large conventional central power stations. The specification of a power-electronic interface is subject to requirements related not only to the renewable energy source itself but also to its effects on the power-system operation, especially where the intermittent energy source constitutes a significant part of the total system capacity. In this paper, new trends in power electronics for the integration of wind and photovoltaic (PV) power generators are presented. A review of the appropriate storage-system technology used for the integration of intermittent renewable energy sources is also introduced. Discussions about common and future trends in renewable energy systems based on reliability and maturity of each technology are presented

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Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey

Due to the stochastic nature of wind, electric power generated by wind turbines is highly erratic and may affect both the power quality and the planning of power systems. Energy Storage Systems (ESSs) may play an important role in wind power applications by controlling wind power plant output and providing ancillary services to the power system and therefore, enabling an increased penetration of wind power in the system. This article deals with the review of several energy storage technologies for wind power applications. The main objectives of the article are the introduction of the operating principles, as well as the presentation of the main characteristics of energy storage technologies suitable for stationary applications, and the definition and discussion of potential ESS applications in wind power, according to an extensive literature review.

A review of energy storage technologies for wind power applications

Energy storage for mitigating the variability of renewable electricity sources: An updated review

Review of energy storage system for wind power integration support

Virtual synchronous generators: A survey and new perspectives

The controls considering the delay time due to the vessel are proposed. To overcome the delay of control, we propose the predictive control base on the modern control theory, which uses state variables instead of the controlled quantities. This control is simulated by use of the dynamic equilibrium code, in which the equilibrium of the system including the vessel and the coils with power supply is determined from the principle of the minimum free energy state. The time evolution of the system follows the circuit equations., The computer simulations show that the modern control can stabilize the positional instability, while the simple proportional control only reduces the growth rate of the mode. Moreover, the much shorter response time is accomplished than L/R time of the vessel by the predictive control.

Control of plasma current and position including the influence of vacuum vessel

多層磁気面法によるトカマクプラズマの動的解析;多層磁気面法によるトカマクプラズマの動的解析;Dynamic Analysis of Tokamak Plasma by Multi-Layers Method

A semi-Lagrangian scheme is applied for the first time to computations of charged particle motions along magnetic field lines, to numerically solve the δf gyrokinetic equations in a flux tube geometry. This new solver adopted in the gyrokinetic Vlasov simulations has an advantage over the conventional Eulerian codes in calculating the parallel dynamics, because semi-Lagrangian schemes are free of the Courant-Friedrichs-Lewy (CFL) condition that restricts the time step size. A study of the accuracy of the parallel motion simulations reveals that numerical errors mainly stem from spatial (not temporal) discretization for realistic values of the grid spacing and time step, and it demonstrates the advantage of the semi-Lagrangian scheme. This novel numerical method is successfully applied to linear gyrokinetic simulations of the ion temperature gradient instability, where time steps larger than those restricted by the CFL condition can be employed.

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A Numerical Method for Parallel Particle Motions in Gyrokinetic

In the plasma current quenching phase, the shell effect of the vacuum vessel, which originally acts as a stabilizing force, becomes instead an inverse shell effect, drawing plasma toward the wall of the vacuum vessel and making It collide with the wall at a speed which is determined by the plasma current reduction speed. By placing an active shell coil, which utilizes the electromotive force caused during the plasma current reduction phase, close to the plasma, it is possible to attain equilibrium automatically during the plasma current reduction phase.

Hiroaki Tsutsui

Papers

Control of plasma current and position including the influence of vacuum vessel

多層磁気面法によるトカマクプラズマの動的解析;多層磁気面法によるトカマクプラズマの動的解析;Dynamic Analysis of Tokamak Plasma by Multi-Layers Method

A Numerical Method for Parallel Particle Motions in Gyrokinetic

Controlling the inverse shell effect of the vacuum vessel during tokamak plasma disruption