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A detailed dynamic study on Synchronous Generators Excitation Systems at Embedded Generation is presented. Through the SIMULINK ambient, several simulations were made and their performances are discussed regarding to System X/R relation changes, Short-Circuit Level, Fault Clearance Time and Voltage Profile. Studied Excitation Systems costs were considered also at the technical evaluation. Results...
This paper compares the transient response of a finite element salient pole synchronous generator model connected to an infinite network bus to that of a system model based on an equivalent circuit representation of the machine. The characteristics and operating conditions of the two models are made equal as far as possible by thoroughgoing initiation and by using the finite element model for estimation...
This paper shows, through simulations using the software Matlab/Simulink, its library Simpowersystems and the standars IEEE 115-1995, IEEE 1110-2002, how to perform load rejection tests for salient pole synchronous generator and sudden short-circuit test for cylindrical rotor synchronous generator and how to obtain the values of the synchronous generator electrical operational parameters which are...
This paper presents a modal analysis of a two machine power system that includes a doubly-fed induction generator (DFIG). The DFIG's model considers rotor flux linkages as dynamic states and stator flux linkages as algebraic variables. Active- and reactive-power controllers are also modeled. Active power is tracked for optimal power extraction from the wind. Using the power system set of differential-algebraic...
Method for wind turbine controller design and test in laboratory still remains a problem. This paper presents a realtime simulator of non-grid-connected wind energy conversion system suitable for controller design and test. The simulation model, which is composed of a fixed-pitch wind turbine, a permanent magnet synchronous generator with PWM voltage source vector control and DC-DC converter with...
It is expected that increasing amounts of new generation technologies will be connected to electrical power systems in the near future. Most of these technologies are of considerably smaller scale than conventional synchronous generators and are therefore connected to distribution grids, as the DFIG-based wind farm. When connected in small amounts, the impact of wind farm on power system transient...
An average value modeling of synchronous machine-rectifier system considering the stator resistance is derived in this paper. A proper voltage-behind-reactance synchronous machine model is used for the generator that allows effective calculation of commutation displacement angle. Simulation results are compared with experimental results to verify the accuracy of the average model.
In this paper the operation of brushless exciter is investigated and a suitable model for use in time-domain simulation of power systems is derived. An efficient voltage-behind-reactance synchronous machine model is used for the exciter. The theoretical equations, describing the operation of rotating rectifier in three rectification modes are derived. The proposed model was verified in time domain...
This paper deals with a modeling approach of an embarked electrical network. This network is composed of a synchronous generator feeding linear and non linear load. In order to simplify the identification of inaccessible part of the generator, a specific modeling approach of the machine is established. Thus, the rotor is modeled by generalized transfer functions. Its order is chosen to have the desired...
Doubly fed induction generator DFIG operating in standalone mode is described. Analysis of single phase model allow for the selection of the filtering capacitance connected to the stator. The standalone DFIG is compared to the classical synchronous generator with DC excitation current. Method of output voltage control using PI controllers of the rotor current is shown. Decoupling between the amplitude...
This paper proposes a modeling procedure of synchronous machine with admittance networks. Load and stator are modeled in a conventional way, i.e. in dq frame. The accent is given to inaccessible parts of the machine (rotor). Hence, the rotorpsilas circuit is modeled with admittance functions. The order of the system, which depends on the desired precision, does not modify the equations set. Parameters...
To study the angular stability in a network of parallel connected synchronous machines, all system components which effect on the transient behaviour of the whole system have to be taken into account. This article investigates the possibility of starting up of the loaded synchronous motor in case of using three parallel-connected salient-pole machines feeding the asynchronous motor. A detailed model...
This paper presents a suitable method for time-domain identification of synchronous machine parameters from the hybrid state model recently introduced by the authors in a compact matrix form. The saturated version of this model is developed in terms of generator equivalent-circuit parameters. The load rejection test of a combined resistive/inductive load is performed for the parameter identification...
In this paper, the torsional interactions in the turbine- generator set due to electric arc furnace (EAF) load are presented. For this purpose a generator, two EAFs and a static VAr compensator (SVC) are considered in a power system. Different stages of EAF operation are modeled. At first stage the direct reduced iron ( DRI) and scrap are being melted and EAF is modeled as a pulsing load. At second...
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