We analyze the time series of hourly average wind speeds measured at 29 different stations located in Sicily, a region with a complex morphology. The investigation, performed from the univariate as well as the multivariate point of view, evidences that the statistical properties of wind at the single sites have features that are not reproduced by standard models and, thus, require specific mode...

The most basic electrical machine that converts mechanical energy into is synchronous machines. Synchronous machines can be operated at high speeds and low for different power plants. In terms of system planning, it important to examine the operating characteristics idle variable load conditions in these cycles. It very generators, which are components turbines plants, have efficiency when they...

Abstract In this paper, the performance of a permanent magnet synchronous generator (PMSG)-based wind energy conversion system (WECS) supplied to an uncontrolled rectifier-fed boost converter (BC) interfaced with three-phase T-type three-level inverter (TLI) has been analysed. The proposed WECS involves three converters, namely rectifier that is used for from AC DC; BC by PMSG-fed enhance volta...

Synchronous hardware design is facing significant challenges as we push for higher clock speeds and more complex chips. Aside from the incredible task of optimizing designs year after year, physical properties of circuits at the current scale and speed are becoming major roadblocks. For example, skew associated with high-fanout clock signals put a great burden the designer by increasing design ...

Trends in parallel computing indicate that heterogeneous parallel computing will be one of the most widespread platforms for computation-intensive applications. A heterogeneous computing environment o ers considerably more computational power at a lower cost than a parallel computer. We propose the Heterogeneous Bulk Synchronous Parallel (HBSP) model, which is based on the BSP model of parallel...

The major hurdle encountered in achieving high performance in servo speed control is the occurrence of large relative errors at low speeds due to torque variations. In this paper, it is shown that this problem can be tackled in the case of synchronous motors, by keeping the stator current and the rotor flux nonorthogonal and including an inner position control loop to improve the transient beha...

In this article, a virtual cogging torque (VCT) control method to reduce the speed ripple of direct-drive permanent magnet synchronous machine servo system under low-speed conditions is proposed. Compared with other factors, at low speeds, main factor that deteriorates drive performance, even induces oscillations. Especially in due volume limitation, designed larger than normal one order remove...

Flywheel energy storage has distinct advantages over conventional energy storage methods such as electrochemical batteries. Because the energy density of a flywheel rotor increases quadratically with its speed, the foremost goal in flywheel design is to achieve sustainable high speeds of the rotor. Many issues exist with the flywheel rotor operation at high and varying speeds. A prominent probl...

Emerging workloads, such as graph processing and machine learning are approximate because of the scale of data involved and the stochastic nature of the underlying algorithms. These algorithms are often distributed over multiple machines using bulk-synchronous processing (BSP) or other synchronous processing paradigms such as map-reduce. However, data parallel processing primitives such as repe...

This paper presents research on a permanent magnet synchronous motor (PMSM) by 5-level T-type inverter using linear quadratic regulator (LQR) control for speed control. The space vector modulation (SVM) structure the to improve quality of PMSM drive system is presented. aims successfully design state feedback controller in system. Simulink results are performed with different ranges and same to...