This paper presents a novel impedance-based approach for out-of-step (OOS) protection of a synchronous generator. The most popular and commonly used approaches for detecting OOS conditions are based on the measurement of positive sequence impedance at relay location. However, FACTS devices change the measured impedance value and thus disrupt the performance of impedance-based relay function. In...

There are cases in which database system benchmarks should be executed in a realistic environment to get meaningful performance results. We propose a workload generator that helps benchmarks be executed in an environment similar to the real world in terms of resource status. The workload generator can create memory-bound, CPU-bound, and I/O-bound workloads. The workload generator allows users t...

System Generator is a high level design tool well suited to creating custom DSP data paths in FPGAs. While providing a high level abstraction of an FPGA circuit, it can be used to build designs comparable to hand crafted implementations in terms of area and performance. In this paper we use a MAC-based FIR filter design example to demonstrate the interplay between mathematical abstraction and h...

At the Naval Research Laboratory (NRL), we have developed a testbed for simulating atmospheric turbulence using Kolmogorov statistics for testing the correctibility of an Adaptive Optical System (AOS). In this testbed, a Liquid Crystal Spatial Light Modulator is being used to induce the atmospheric turbulence and a MEM deformable mirror is being used in the AOS to correct it. This atmospheric t...

1. A Short Overview In the present paper we study special subsequences of the CRAY-system random number generator RANF. Such subsequences are used to obtain parallel streams of random numbers. RANF is a linear congruential generator (LCG), and hence it is well known that overlapping s-tuples of random numbers generated from RANF produce grid structures in dimension s ≥ 2. In Section 3 we give a...

v A user-oriented synthetic workload generator that simulates users' file access behavior based on real workload characterization is described. The model for this workload generator is (i) user-oriented and job-unspecific, (ii) represents file I/O operations at the system call level, (iii) allows general distributions for the usage measures, and (iv) assumes independence in the file I/O operati...

Power system stabilizers have been widely used and successfully implemented for the improvement of power system damping. However, a fixed parameter power system stabilizer tends to be sensitive to variations in generator dynamics so that, for operating conditions away from those used for design, the effectiveness of the stabilizer can be greatly impaired. With the advent of microprocessor techn...

Standard programming tools use a system of error messages and warnings to help programmers in finding syntax and logical errors in their programs. Generative programming differentiates the level of generator from the level of generated application. The source code is synthesized at the level of generator from a set of code templates according to application specification and rules defined by ge...

This paper presents Simulation and experimental study aimed at investigating the effectiveness of an adaptive artificial neural network stabilizer on enhancing the damping torque of a synchronous generator. For this purpose, a power system comprising a synchronous generator feeding a large power system through a short tie line is considered. The proposed adaptive neuro-control system consists o...