Harmonic reduction methods for electrical generation: a review

Fallows, Daniel; Nuzzo, Stefano; Costabeber, Alessandro; Galea, Michael

doi:10.1049/iet-gtd.2018.0008

Cited by 35 publications

(26 citation statements)

References 70 publications

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“…Here fill factors up to 60% can be achieved, but the design is limited to only concentrated windings, since the winding is wound directly on the tooth. Concentrated windings have advantages like shorter end windings (reduced copper loss) and higher fill factor compared to distributed windings, but they come at the cost of a lower fundamental of flux linkage and induced voltages [25] and higher eddy current losses in permanent magnets (when present).…”

Section: A Round Conductorsmentioning

confidence: 99%

Challenges and Future opportunities of Hairpin Technologies

Arzillo

Braglia

Nuzzo

et al. 2020

2020 IEEE 29th International Symposium on Industrial Electronics (ISIE)

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Hairpin windings are seeing an ever-increasing application and development in electrical machines designed for high power and torque densities. In fact, due to their inherently high fill factor, they are very attractive in applications, such as transportation, where these characteristics are considered main design objectives. On the other hand, high operating frequencies also contribute to improve power density of electrical machines. However, at high fundamental frequencies, hairpin windings are characterised by increased Joule losses due to skin and proximity effects. Hence, while these technologies are introducing new opportunities, a number of challenges still need to be addressed. These include manufacturing aspects, contacting processes, thermal management, etc. This paper presents an overview of the current state-of-the-art of hairpin technologies and propose possible future opportunities. The authors' perspective is then finally provided, showing how innovative winding patterns can potentially overcome the above mentioned challenges.

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Section: A Round Conductorsmentioning

confidence: 99%

Challenges and Future opportunities of Hairpin Technologies

Arzillo

Braglia

Nuzzo

et al. 2020

2020 IEEE 29th International Symposium on Industrial Electronics (ISIE)

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“…where subscripts '1' and 'h' represent fundamental and harmonic components respectively, 1 Substituting the values of VS, Vq, VR and iT in (18) and comparing the fundamental and harmonic components, the required injected voltage to facilitate the transfer of harmonic current in (21) through the line to microgrid 2 is obtained as follows:…”

Section: Fig 3 Principle Of Harmonic Current Compensationmentioning

confidence: 99%

“…The benefits of SSND can help address challenges faced by microgrids in the proposed MMG system. Currently, there are many challenges involved in the operation of a microgrid including proliferation of nonlinear loads such as electric vehicles (EVs) [18], complexities in future expansions and uncertainties in power exchanges among interconnected microgrids [19], islanding scenarios [20], etc. Due to the challenges described previously, there is a lack of coordination among different microgrids in MMG systems, which results in improper load sharing.…”

Section: Introductionmentioning

confidence: 99%

Non‐local harmonic current and reactive power compensation for a multi‐microgrid system using a series–shunt network device

John

Patsios

Greenwood

2020

IET Generation, Transmission & Distribution

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In this paper, a new non-local active compensation method is developed for a multi-microgrid (MMG) system. The current industry practice is to utilize local harmonic current and reactive power compensation methods, however local compensation methods are not practical for large MMG system with widely dispersed non-linear loads, because each nonlinear load would require its own compensator. To overcome this problem, a novel compensating technology called a seriesshunt network device (SSND) is installed between a pair of microgrids in the proposed MMG system. The SSND reduces the number of local compensators required while also performing additional functions in comparison with conventional devices. For effective control of the SSND, an improved model predictive control (MPC) algorithm, which gives better tracking accuracy and faster set-point change than that of a conventional proportional-integral (PI) controller, is also presented. Analysis and simulations verify the capability of SSND in performing both local and non-local active compensation of harmonic current and reactive power in the proposed MMG system under various test scenarios. Simulation results show that the MPCcontrolled SSND can achieve effective compensation, thereby resulting in a very low current total harmonic distortion (THD) value of 2.4% and a unity power factor at the distribution grid side.

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“…Thereby new techniques and techniques already used for harmonic attenuation can be implemented for harmonic mitigation on synchronous generators operating in parallel with squirrel cage induction generators in nonsinusoidal regime. Such publications can be adapted to continue this research line for harmonic reduction in the isolated system proposed here.…”

Section: Additional Commentsmentioning

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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Harmonic reduction methods for electrical generation: a review

Cited by 35 publications

References 70 publications

Challenges and Future opportunities of Hairpin Technologies

Challenges and Future opportunities of Hairpin Technologies

Non‐local harmonic current and reactive power compensation for a multi‐microgrid system using a series–shunt network device

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

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