Design and FEM analysis of dual excited synchronous generator

Reddy, Agarala Ajaysekhar; Bhat, Sunil; Ugale, R. T.

doi:10.1109/npec.2017.8310475

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…In the literature, DESGs have been presented as significantly better generators than conventional synchronous generators (CSGs) in strengthening the system's reliability and stability, and for their independent control of the voltage or reactive power and torque or active power [18][19][20] with DC excitation. The design and finite element analysis of DESGs with non-salient pole core rotors [21] or slot core rotors [22,23] with different excitation techniques also show that the performance of DESGs is better than that of the CSG. It has been proposed that the DESG can also be used in electric vehicles [24] with the help of a variable voltage and a variable frequency converter to overcome the present issue of the unequal diameter of wheels in vehicles.…”

Section: Introductionmentioning

confidence: 97%

A Novel Approach to Using Dual-Field Excited Synchronous Generators as Wind Power Generators

Agarala,

Bhat,

Zychma

et al. 2024

Energies

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Integrating wind power generators, whose frequency varies in a wide range due to varying wind speeds, into a grid is a formidable problem. At present, the use of permanent magnet synchronous generators (PMSG) and doubly fed induction generators (DFIG) as wind generators with suitable control is the best possible solution. However, a dual-field excited synchronous generator (DESG), which has two windings on the rotor, can also be used for the same purpose with appropriate control. A new control strategy, which essentially employs the d-axis and q-axis components of the alternator terminal voltage, is suggested here. This strategy essentially results in exciting the two field windings with a slip frequency. This eventually holds the stator frequency constant, irrespective of the rotor speed of the wind generator. The difference between the required frequency and the natural frequency, analogous to the rotor speed of the wind power generator, is the slip frequency. The ring modulator automatically adjusts the slip frequency depending on the actual speed of the generator’s rotor. This paper uses the ANSYS MAXWELL 2022 R1 software to design a DESG and uses a ring modulator as the control function generator for feedback with ANSYS TWIN BUILDER 2022 R1. Simulations are carried out using transient–transient co-simulation by combining both of these software tools for cases of both a constant-speed input and of a variable-speed input to the rotor of the machine. Moreover, a mathematical model of the DESG as a wind generator with the proposed controlled strategy is used to perform the stability analysis of a nine-bus three-machine system, and the results are compared with those of conventional wind generators.

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Section: Introductionmentioning

confidence: 97%

A Novel Approach to Using Dual-Field Excited Synchronous Generators as Wind Power Generators

Agarala,

Bhat,

Zychma

et al. 2024

Energies

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“…The DESG has been introduced in the literatures as one of the important methods for improving steady-state and dynamic stability, enhancing the reliability of the system, and controlling the active and reactive powers independently [22]- [24]. In [25]- [27], various analyses of DESG based on finite element models showed that the DESG is more stable and reliable than the conventional synchronous generator. By using a suitable control method for DESG field voltages, terminal voltages with constant magnitude and frequency could be produced regardless of the variation of rotation speed [18].…”

Section: Introductionmentioning

confidence: 99%

Active and Reactive Power Control for Dual Excited Synchronous Generator in Wind Applications

2022

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This paper presents the dual excited synchronous generator (DESG) as a novel suitable alternative generation system in wind energy conversion systems. A new control strategy has been proposed for the DESG wind turbine system. With this control technique, the DESG could be operated as a constantspeed constant-frequency (CSCF) generation system with the benefit of adjusting the reactive power or a variable-speed constant-frequency (VSCF) generation system with the benefits of simple control methods and lower copper losses. Using the space phasor model of DESG, a direct relationship between the electromechanical torque and the armature reactive power in terms of the field current space phasor magnitude and the field voltage space phasor angle is provided. The proposed control strategy is based on controlling the field current space phasor magnitude and the field voltage space phasor phase angle to regulate the active and reactive powers of the DESG. Simulation results, based on MATLAB/SIMULINK, for a 1.1 kW DESG wind turbine system have been executed to verify the introduced control technique under various operating conditions. Also, experimental studies have been carried out to validate the simulation results using the proposed control algorithm.INDEX TERMS Wind energy conversion system, Dual excited synchronous generator. Reactive power control, Maximum power point tracking.

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“…In various previous publications, DESGs have been analyzed as an important strategy for improving dynamic and steady-state stability, and increasing system reliability (Reddy et al, 2017; Xu et al, 2021). Russia in 1980s, has successively manufactured DESG with capacity from 110 up to 800 MW, and utilized them into the capital power grid with high reliability (Xu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Investigation of LVRT capability of wind driven dual excited synchronous generator

2022

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This paper proposes an effective control technique for low voltage ride through (LVRT) capability in dual excited synchronous generator (DESG) wind turbines. The proposed control technique is dependent on controlling the field circuit parameters. Where the active power is controlled by the field-current space phasor magnitude and the reactive power is controlled by the field-voltage space phasor phase. With the proposed control strategy, the DESG can generate additional reactive power to support grid voltage recovery under grid faults. The DC-link voltage is kept within an acceptable limit since the excess power, due to the power mismatch between the mechanical and armature power is stored in the generator inertia. Using the proposed control strategy, the DESG can enhance the LVRT capability efficiently without using extra protection circuits or any additional control techniques during fault conditions. To test the proposed control method, simulation, and experimental results for a 1.1 kW DESG wind turbine system were obtained.

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Design and FEM analysis of dual excited synchronous generator

Cited by 4 publications

References 12 publications

A Novel Approach to Using Dual-Field Excited Synchronous Generators as Wind Power Generators

A Novel Approach to Using Dual-Field Excited Synchronous Generators as Wind Power Generators

Active and Reactive Power Control for Dual Excited Synchronous Generator in Wind Applications

Investigation of LVRT capability of wind driven dual excited synchronous generator

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