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A real wind power generation system is given in this paper. SVM control strategy and vector control is applied for generator side converter and doubly fed induction generator respectively. First the mathematical models of the wind turbine rotor, drive train, generator side converter are described. Then the control strategy of generator side converter system is given in detail. Finally the simulation...
We give new pseudorandom generators for regular read-once branching programs of small width. A branching program is regular if the in-degree of every vertex in it is either 0 or 2. For every width d and length n, our pseudorandom generator uses a seed of length O((log d + log log n + log(1/ϵ)) log n) to produce n bits that cannot be distinguished from a uniformly random string by any regular width...
This paper presents a new approach for wide area dynamic monitoring of the system with many possible applications. One such application is discussed to provide real time stability controls. The new approach utilizes a substation based dynamic state estimation. The substation based dynamic state estimation uses data from relays, PMUs, meters, FDRs etc in the substation only thus avoiding all issues...
This paper presents a new computation method for transient stability analysis for electric power systems. Different from existing methods, a minimization problem is formulated for obtaining critical clearing time (CCT). The method is based on the computation of a trajectory on the stability boundary, which is referred to as critical trajectory in this paper. The critical trajectory is defined as the...
Based on the concept of hybrid shift-invariant spaces, we develop a distributed protocol for the reconstruction of time-varying physical fields in wireless sensor networks. The localized nature of these spaces allows for a clustered network architecture that leads to low communication overhead. Capitalizing on the sparsity of the reconstruction matrix, we propose an iterative reconstruction algorithm...
Recently, battery powered RFID tags have attracted attention as the latest technology for commodity management. Every day, we come across many applications where passive and active RFID tags are used. But active tags not really portable due to battery which demands frequent charging and replacement. As battery technology is not advancing by the same rate, thus we need to think concretely for an alternate...
Stochastic assessment is a method to predict the severity and number of voltage sags at a bus of interest in the transmission network. In this paper, a technique using impedance matrix for stochastic assessment was developed to predict the voltage magnitudes due to faults at any bus in the electrical network. The proposed technique was applied to IEE 24- bus electrical network to illustrate its application...
This work presents a novel algorithm for decomposing NFA automata into one-state-active modules for parallel execution on multiprocessor systems on chip (MP-SoC). Furthermore, performance related studies based on a 16-PE system for Snort, Bro and Linux-L7 regular expressions are presented.
The classification of quaternary [21s+t,3,d] codes with dges16s and without zero coordinates is reduced to the classification of quaternary [21c(3,s,t)+t,k,d] code for sges1 and 0lestles20, where c(3,s,t)les min{s, 3t} is a function of 3, s, and t. Quaternary optimal Hermitian self-orthogonal codes are characterized by systems of linear equations. Based on these two results, the complete classification...
The classification of quaternary [21s+t,3,d] codes with dges16s and without zero coordinates is reduced to the classification of quaternary [21c(3,s,t)+t,k,d] code for sges1 and 0lestles20, where c(3,s,t)les min{s, 3t} is a function of 3, s, and t. Quaternary optimal Hermitian self-orthogonal codes are characterized by systems of linear equations. Based on these two results, the complete classification...
Based on hybrid reference frame modeling and Kronpsilas tensor method, a simulation system of brushless doubly-fed generator (BDFG) is presented. Through network transformation, the model can deal with the time-varying topology and form the coupled system equations automatically. The simulation for inverter-BDFG generator system can get accurate results fleetly.
This paper presents a numerical method to analyze the complex process of fault synchronizing parallel operation. A set of state-space equations is adopted to calculate the transient current and electromagnetic torque of the process. A new type of high-voltage synchronous generator is introduced for fault synchronizing parallel operation.
Because of indeterminacy problem with selecting energy function of generator Hamiltonian model, a modeling method is proposed to derive Hamiltonian model from fundamental energy relation of generator. Under single machine infinite-bus system and ignoring D-Q damping winding, in response to mechanical and electric analytical dynamics, this paper establishes Lagrange functions, dissipation functions...
In view of large variation of output voltage of the self-excited single-phase induction generator, this paper presents a connection method of voltage self-regulation of the single-phase self-excited induction generator with series capacitance, which decreases the generatorpsilas voltage variation rate. The operation of self-excited single-phase of the three-phase induction generator is analyzed by...
The purpose of this paper is to present an accurate model for a power turbine generator (PTG) system in dynamic characteristics. The PTG system is a waste heat recovery type generation system making use of exhaust gas from the main shipboard diesel engines. However, with the PTG systems, the dynamic characteristics are not entirely clear. So, an accurate simulation model is clarified for the safe...
Renewable energy power generation technology, such as wind power and PV system, has developed rapidly nowadays. The wind/PV hybrid system has become a promising power generation form due to the natural complementary character of wind power and PV power. Storage devices are usually equipped in the hybrid system to constitute Micro-grid through appropriate energy management strategies to improve the...
Taking Matlab/Simulink as a platform, a single-machine infinite-bus system simulation model of AC excited generator (ACEG) is established. The stator flux oriented vector control strategy and direct power control strategy of ACEG are proposed in this paper. With this model of ACEG, the steady state regulation characteristics of active power and reactive power and the transient processes of a sudden...
Double-winding AC-DC generators are used in self-contained electrical systems. A 3-phase winding and a 12 phase winding set are installed on the stator of the machine, the former delivering AC power and the latter supplying DC power through a bridge rectifier. In this paper, mathematical models are set up in d-q coordinates and the corresponding electromagnetic parameters are proposed for studying...
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