• Title, Summary, Keyword: synchronous generator

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Single-Phase Virtual Synchronous Generator for Distributed Energy Resources Integration

  • Zeng, Zheng;Cheng, Chong;Tang, Shengqing;Yang, Huan;Zhao, Rongxiang
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.3
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    • pp.264-271
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    • 2014
  • Virtual synchronous generator (VSG) in single-phase to interface distributed renewable energy resources is investigated in this paper. Mathematical models and numerical analysis are utilized to illustrate the features of the VSG. Enhanced control strategy is presented to ensure the performance of the VSG. Besides, a second order generalized integer (SOGI) is employed to calculate the instantaneous output power of the VSG in virtual ${\alpha}{\beta}$ frame. By the means of a phase-locked loop based scheme, the VSG can seamlessly transform between islanded and grid-tied modes, which can meet the requirements of micro-grid. At last, the validation and the proposed approach are verified by the simulated results using PSCAD/EMTDC.

Optimal Design and Performance Analysis of Permanent Magnet Assisted Synchronous Reluctance Portable Generators

  • Baek, Jeihoon;Kwak, Sangshin;Toliyat, Hamid A.
    • Journal of Magnetics
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    • v.18 no.1
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    • pp.65-73
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    • 2013
  • In this paper, design and performance analysis of robust and inexpensive permanent magnet-assisted synchronous reluctance generators (PMa-SynRG) for tactical and commercial generator sets is studied. More specifically, the optimal design approach is investigated for minimizing volume and maximizing performance for the portable generator. In order to find optimized PMa-SynRG, stator winding configurations and rotor structures are analyzed using the lumped parameter model (LPM). After comparisons of stator windings and rotor structure by LPM, the selected stator winding and rotor structure are optimized using a differential evolution strategy (DES). Finally, output performances are verified by finite element analysis (FEA) and experimental tests. This design process is developed for the optimized design of PMa-SynRG to achieve minimum magnet and machine volume as well as maximum efficiency simultaneously.

Optimal Design of a Distributed Winding Type Axial Flux Permanent Magnet Synchronous Generator

  • You, Yong-Min;Lin, Hai;Kwon, Byung-Il
    • Journal of Electrical Engineering and Technology
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    • v.7 no.1
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    • pp.69-74
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    • 2012
  • This paper presents a distributed winding type axial flux permanent magnet synchronous generator (AFPMSG) with reduced the total harmonic distortion (THD), suitable for wind turbine generation systems. Although the THD of the proposed distributed winding type is more reduced than the concentrated winding type, the unbalance of the phase back EMF occurs. To improve the unbalance of the phase back EMF and the output power of the distributed winding type AFPMSG, the Kriging based on the latin hypercube sampling (LHS) is utilized. Finally, these optimization results are confirmed by experimental results. As a result, the unbalance of the phase back EMF and the output power of the distributed winding type AFPMSG were improved while maintaining the total harmonic distortion (THD) and the average phase back EMF.

Characteristics of Maximization Output Control for Variable Wind Generation System Using IPMSG (IPMSG을 이용한 풍력 발전 시스템의 최대 출력화 제어 특성)

  • Mun, Sang-Pil;Heo, Young-Hwan;Kim, Jong-Suk;Park, Han-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.3
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    • pp.151-157
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    • 2016
  • This paper proposes the variable wind generation system based on the direct torque control(DTC)for the interior permanent magnet synchronous generator. The proposed system can achieve the MPPT control without wind speed in addition to the speed and position sensorless control as well as the conventional current control method. The DTC has several advantages such as simply system configuration, ease of the flux weakening control and the sensorless control. The experimental results show the performance of the proposed wind generation system.

A Study on Design and Performance Analysis of a Prototype Permanent Magnet Synchronous Generator (영구자석 동기발전기의 설계 및 시제품 특성 분석에 관한 연구)

  • Oh, Jin-Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.7
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    • pp.75-80
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    • 2014
  • The small wind turbines has the merits of setting up with low costs by individuals, and get the energy saving effects that, it has the secured, separate markets from the big range systems, and the developing of it is continuously proceeding. The objective of this paper is to provide the design characteristics analysis of a permanent magnet synchronous generator(PMSG) skewed for magnet of rotor, the main advantage to be explored with the use of a split core design is the reduction in manufacturing costs and its simplicity in manufacture, compared to the manufacturing costs of a core skew PM machine. This thesis is aiming mainly analyzing the characteristics of the prototype to verify through Finite Element Method(FEM) and tests.

Low-Voltage and High-Current DC Output Realized by Multiple Power Cells Based on Deadbeat and Automatic Current Sharing Control

  • Liu, Jinfeng;Zhang, Yu;Wang, Xudong;IU, Herbert Ho-Ching
    • Journal of Electrical Engineering and Technology
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    • v.12 no.4
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    • pp.1575-1585
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    • 2017
  • This paper presents a synchronous generator with a distributed system of multiple parallel three-phase power cells. This generator can immediately output high DC. Each power cell comprises three-phase windings and a three-phase synchronous rectification bridge with a deadbeat control of load power feedforward, which can improve the characteristics of dynamic response and reflect the load variance in real time. Furthermore, each power cell works well independently and modularly using the method of automatic maximum current sharing. The simulation and experimental results for the distributed controller of multiple power cells demonstrate that the deadbeat control method can respond quickly and optimize the quality of the energy. Meanwhile, automatic maximum current sharing can realize the validity of current sharing among power cells.

Adaptive Sliding Mode Controller Design of Permanent Magnet Synchronous Generator for Variable-Speed Wind Turbine System (가변속 풍력 발전용 영구자석형 동기발전기의 적응 슬라이딩 모드 제어기 설계)

  • Kim, Seong-Soo;Choi, Han Ho
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.5
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    • pp.315-319
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    • 2016
  • This paper proposes a simple adaptive sliding mode control algorithm for controlling a permanent magnet synchronous generator (PMSG) of a MW-class direct-driven wind turbine system. The proposed adaptive sliding mode controller does not require accurate knowledge of the PMSG parameter or turbine torque values. The proposed controller can accurately track the reference angular speed computed by the maximum power point tracking(MPPT) algorithm. Finally, this paper gives Matlab/Simulink simulation results to verify the practicality and effectiveness of the proposed adaptive sliding mode controller.

Experimental Evaluation on Power Loss of Coreless Double-side Permanent Magnet Synchronous Motor/Generator Applied to Flywheel Energy Storage System

  • Kim, Jeong-Man;Choi, Jang-Young;Lee, Sung-Ho
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.256-261
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    • 2017
  • This paper deals with the experimental evaluation on power loss of a double-side permanent magnet synchronous motor/generator (DPMSM/G) applied to a flywheel energy storage system (FESS). Power loss is one of the most important problems in the FESS, which supplies the electrical energy from the mechanical rotation energy, because the power loss decreases the efficiency of energy storage and conversion of capability FESS. In this paper, the power losses of coreless DPMSM/G are separated by the mechanical and rotor eddy current losses in each operating mode. Moreover, the rotor eddy current loss is calculated by the 3-D finite element analysis (FEA) method. The analysis result is validated by separating the power loss as electromagnetic loss and mechanical loss by a spin up/down test.

Adaptive Controller Design for a Synchronous Generator with Unknown Perturbation in Mechanical Power

  • Jiao Xiaohong;Sun Yuanzhang;Shen Tielong
    • International Journal of Control, Automation, and Systems
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    • v.3 no.spc2
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    • pp.308-314
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    • 2005
  • Transient stabilization with voltage regulation is investigated for a synchronous generator when the mechanical power is perturbed to any unknown value within its physical bounds so that the operating point of the system shifts to an unknown point. An adaptive excitation controller is designed based on the backstepping method with tuning functions. It will be shown that the adaptive control law proposed can achieve the convergence of the system states to the new equilibrium point in correspondence with the real value of the unknown mechanical power and the regulation of the terminal voltage to the required value. Simulation results are given to demonstrate the effectiveness of the proposed controller for the transient stabilization and voltage regulation.

A Study of Shorted-Turn Detection in the Cylindrical Synchronous Generator Rotor Windings via Discrete Wavelet Transform (이산 웨이브렛 변환을 이용한 동기발전기 회전자 층간단락 진단에 관한 연구)

  • Kim, Y.J.;Kim, J.M.
    • Proceedings of the KIPE Conference
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    • pp.476-478
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    • 2005
  • This paper describes a method for the detection of shorted-turn in the cylindrical synchronous generator rotor windings based on the discrete wavelet transform. Multi-resolution analysis(MRA) based on discrete wavelet transform provides a set of decomposed signals in independent frequency bands. In the proposed method, shorted-turn detection in rotor windings is based on the decomposition of the rotor currents, where wavelet coefficients of these signals have been extracted. Comparing these extracted coefficients is used for diagnosing the healthy machine from faulty machine. Experimental results show the effectiveness of the proposed method for shorted-turn detection in the cylindrical synchronous generator rotor windings.

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