Improved Synchronous Machine Rotor Design for the Easy Assembly of Excitation Coils Based on Surrogate Optimization

Yuan, Tao; Yang, Nan; Zhang, Wei; Cao, Wenping; Xing, Ning; Li, Guofeng

doi:10.3390/en11051311

Cited by 5 publications

(7 citation statements)

References 17 publications

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“…e torque profiles of these topologies are further improved by utilizing an optimal design method in [24]. In [25], the performance of WRSMs was improved by changing the tip structure of the rotor poles. In [26], a WRSM topology was proposed to enhance its performance by placing a rare-earth magnet between the rotor poles.…”

Section: Introductionmentioning

confidence: 99%

Brushless Wound Rotor Synchronous Machine Based on a Consequent-Pole Rotor Structure with Better Torque Attributes

Bukhari

Shah

et al. 2022

International Transactions on Electrical Energy Systems

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This paper presents a subharmonic-based brushless wound rotor synchronous machine (BL-WRSM) topology with permanent magnet-assisted (PMA) and consequent-pole (CP) rotor structures to achieve better torque characteristics as compared to the conventional subharmonic-based brushless WRSM. The proposed topologies use the conventional high-efficient subharmonic field excitation technique to achieve a brushless operation and a lower volume of permanent magnet (PM) to achieve better average, starting, maximum, and minimum torques and lower torque ripple. A four-pole, twenty-four-slot (4-pole/24-slot) machine with conventional, PM-assisted (PMA), and consequent-pole (CP) rotor structures are developed in a JMAG-Designer 20.1 environment to carry out two-dimensional finite element analysis (2D-FEA). The developed machines are used to validate the operation and achieve electromagnetic and electromechanical performances of the proposed subharmonic-based BL-WRSM topologies with better torque attributes.

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Section: Introductionmentioning

confidence: 99%

Brushless Wound Rotor Synchronous Machine Based on a Consequent-Pole Rotor Structure with Better Torque Attributes

Bukhari

Shah

et al. 2022

International Transactions on Electrical Energy Systems

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“…They are used as round-pole high-speed turbo alternators in thermal power plants. It has also been used in wind power plants in recent years [1]. Synchronous generators are electrical machines that are mostly preferred to provide high capacity power generation and produced at different power levels from a few kVA to hundreds of MVA [2].…”

Section: Introductionmentioning

confidence: 99%

Design Improvement of a 2 Mva Synchronous Machine by Using Particle Swarm Optimization

DOĞAN>

Orhan

2022

International Journal of Energy and Smart Grid

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In this article; The step-by-step design of a 3-phase salient synchronous generator and efficiency optimization with particle swarm optimization technique are investigated. Unlike other studies in the literature, a system has been studied to minimize mathematical equation errors by using specific loading parameters that simplify the design process. It has been tried to obtain a program structure that minimizes programming problems by minimizing the number of variables used in the design. With the optimization of the specific loading parameters, the effects on the machine volume, cost and efficiency were examined.

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“…There are other research lines to improve the operation excitation system for synchronous machines based on the use of subharmonic excitation [15], improving the rotor design [16], or nonlinear excitation control [17].…”

Section: Introductionmentioning

confidence: 99%

Use of Discharge Resistor to Improve Transient De-Excitation in Brushless Synchronous Machines

et al. 2019

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The discharge resistor is only used in case of electrical trip to reduce the field current as fast as possible and to minimize the damages produced by the short-circuit current supplied by the synchronous machine. The connection of the discharge resistor is done by opening the field breaker and it implies a large negative voltage in the field winding. This negative voltage is limited to 80% of the winding insulation voltage. On the other hand, in case of a transient de-excitation, at the first moment, the automatic voltage regulator (AVR) reduces the field voltage to the minimum. In case of one-quadrant rectifier type AVR, the minimum voltage is zero and in case of two-quadrant rectifier AVR, the minimum voltage is close to the ceiling voltage with negative polarity. In both cases, the minimum voltages are much smaller than the negative voltage produced by the connection of the discharge resistor. This paper presents a new system that improves the transient de-excitation of synchronous machines using the discharge resistor by an additional static field breaker (SFB). The control of the static field breaker and consequently the connection and disconnection of the discharge resistor is done based on the output field voltage supplied by the AVR. This allows the exciter field current to be reduced in a faster way and continue with the normal operation of the machine after the transient. In this study, the correct operation of the additional static field breaker (SFB) has been validated by computer simulations and experimental test in a 15 MVA generator comprising a commercial one-quadrant rectifier AVR type obtaining excellent results.

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Improved Synchronous Machine Rotor Design for the Easy Assembly of Excitation Coils Based on Surrogate Optimization

Cited by 5 publications

References 17 publications

Brushless Wound Rotor Synchronous Machine Based on a Consequent-Pole Rotor Structure with Better Torque Attributes

Brushless Wound Rotor Synchronous Machine Based on a Consequent-Pole Rotor Structure with Better Torque Attributes

Design Improvement of a 2 Mva Synchronous Machine by Using Particle Swarm Optimization

Use of Discharge Resistor to Improve Transient De-Excitation in Brushless Synchronous Machines

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