Analysis of the oscillations caused by harmonic pollution in isolated synchronous generators

Vanço, Wagner E.; Silva, Fernando Bento; Monteiro, José Roberto Boffino de Almeida; Oliveira, J. M.; Alves, Antônio César Baleeiro; Júnior, Carlos A.B.

doi:10.1016/j.epsr.2017.03.003

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…In order to calculate the voltage and current rms values, power factor and power generated from the experiments, while considering harmonic pollution, one uses the energy quality theory, which can be found in [26]- [28]. Tables 4, 5 and 6, present respectively, the comparison between the digital simulation and the experimental test, for the synchronous generator analysis on the induction generator load.…”

Section: Theoretical-experimental Results and Discussionmentioning

confidence: 99%

A Proposal of Expansion and Implementation in Isolated Generation Systems Using Self-Excited Induction Generator With Synchronous Generator

et al. 2019

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This work presents a theoretical and experimental study of the self-excited three-phase induction generator in steady state, operating with a synchronous generator for use in isolated generation. Through the remoteness of many locations or because of the absence of an energy distribution network, difficulties exist in the supply of electric energy. The proposal contemplated herein can be applied in order to provide a well-adjusted voltage and reduce project costs in the expansion and implementation of isolated systems. That is, when taking into consideration acquisition costs of the asynchronous squirrel cage rotor machine in relation to the synchronous generator. The main contribution of this study is the making of the synchronous generator into a voltage regulator of the isolated system, in such a manner that the synchronous generator supplies the minimum of active power necessary, where a lower power generator is able to play the role of being the sole voltage regulator.

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Section: Theoretical-experimental Results and Discussionmentioning

confidence: 99%

A Proposal of Expansion and Implementation in Isolated Generation Systems Using Self-Excited Induction Generator With Synchronous Generator

et al. 2019

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“…Similarly, the currents of the fifth harmonic order, when circulating on the stator windings generate a rotating magnetic field five times the value of the synchronous speed. These harmonic currents are of negative sequence, and will produce a magnet field that spins in the opposite direction to the rotor, thus resulting in a magnetic field that cuts the rotor windings with a speed of ( ω −[−5 ω ] = 6 ω ), resulting in an induced current of the sixth harmonic order …”

Section: Mathematical Modelling Harmonics In Synchronous and Inductmentioning

confidence: 99%

Effects of harmonic pollution on salient pole synchronous generators and on induction generators operating in parallel in isolated systems

Vanço

Silva

Oliveira

et al. 2020

Int Trans Electr Energ Syst

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Summary This work presents a study of the disturbances caused by harmonic pollution in salient pole synchronous generators (SPSG) and induction generators, when operating in parallel in isolated systems. SPSG are known to operate with induction generators, since the excitation system of the synchronous generator is responsible for the voltage control on the island system. Due to the increase in the employment of power electronics, the loads take on a nonlinear behavior, where these become responsible for the generation of harmonics, due to the switching of electrical devices. Therefore, the analysis of the disturbances that these loads cause in generators, in this proposed and studied architecture, becomes essential. For the synchronous generator, there is also presented the analyses of the oscillations for voltages and currents on the dq0 model, the currents induced on the damper winding, the disturbances on the load angle and on the field current. In terms of the induction generator, the voltage and current oscillations are also analyzed from the dq0 model on the slip frequency. All the identified and quantified disturbances are oscillations on the electric variables, which possess a pulsating nature of frequencies 6ω, 12ω, and 18ω for the synchronous and induction generators, the oscillations of the sixth order and its multiples, will be given in the harmonic slip frequency of their respective harmonic orders in positive and negative sequence. In this way, verification is made as to the appearance of high slippage on the rotor of the induction generator.

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“…However, the negative phase sequence currents will produce, in the air gap, an m.m.f that is moved at the opposite speed to the rotor, with an angular velocity of (−ω). By considering the magnetomotive force of the fundamental component between the stator and the rotor, [24]- [26] is able to mathematically describe this effect:…”

Section: Unbalance In Synchronous Machinesmentioning

confidence: 99%

A Study of the Impacts Caused by Unbalanced Voltage (2%) in Isolated Synchronous Generators

2019

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This paper presents an analysis of the oscillations caused by unbalanced loads in salient pole synchronous generators that operate in isolation under steady state. The oscillatory disturbances, arising from the second-order harmonics, may have or have the potential to cause electromechanical damage to the salient pole synchronous generator. In this paper, the goal is to identify and quantify the magnitude of the electromagnetic torque, which assumes an oscillatory form due to the current component from the negative sequence, caused by unbalanced currents. The self-same analysis was included for second-harmonic voltage oscillations in the qd0 domain, the currents induced on the damper windings together with the oscillation of the load angle and on the field current. These oscillations situated on the synchronous generator are analyzed for a degree of voltage unbalance close to 2% which is an acceptable value according to international regulations for power supply from distribution networks, and this same degree of tolerated voltage unbalance will be used herein for isolated synchronous generators.

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Analysis of the oscillations caused by harmonic pollution in isolated synchronous generators

Cited by 13 publications

References 17 publications

A Proposal of Expansion and Implementation in Isolated Generation Systems Using Self-Excited Induction Generator With Synchronous Generator

A Proposal of Expansion and Implementation in Isolated Generation Systems Using Self-Excited Induction Generator With Synchronous Generator

Effects of harmonic pollution on salient pole synchronous generators and on induction generators operating in parallel in isolated systems

A Study of the Impacts Caused by Unbalanced Voltage (2%) in Isolated Synchronous Generators

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