scholarly journals No‐load voltage and damper winding loss and heat analysis of the pole shoe and damper winding centre line shifted structure of tubular hydro‐generators

2021 ◽  
Author(s):  
Zu‐ying Bian ◽  
Zhi‐ting Zhou ◽  
Zhen‐nan Fan
Keyword(s):  
Load Voltage ◽  
Centre Line ◽  
Winding Loss ◽  
Damper Winding

Optimization of No-Load Voltage Waveform in a Large Hydro-Generator by the Schemes which Shift the Damper Winding and Skew Stator Slots

2012 ◽  
Vol 614-615 ◽  
pp. 397-403
Author(s):  
Yong Gang Luo ◽  
Zhen Nan Fan
Keyword(s):  
Electromagnetic Field ◽  
Test Data ◽  
Coupling Model ◽  
Voltage Waveform ◽  
Load Voltage ◽  
Electric Network ◽  
Design Standard ◽  
Design Scheme ◽  
Calculation Results ◽  
Damper Winding

Improvement of no-load voltage waveform is a important problems for designing hydro-generators and ensuring operation reliability of the generators and electric network. The no-load voltage waveforms of a 335MW hydro-generator are optimized with the design scheme which shift damper winding and skew stator slots, and the computations are implemented and analyzed by the multi-slice moving electromagnetic field-circuit coupling model of the hydro-generator The results show that the waveforms of the no-load voltage are improved observably when reasonable shift damper winding and skewing stator slots. The calculation results are coincident well with the test data. The research is helpful for improving design standard and enhancing the operation reliability of the large hydro-generator and electric network.

Calculation of no-load damper-winding loss in synchronous machines

1932 ◽  
Vol 51 (1) ◽  
pp. 46-46 ◽  
Author(s):  
E. I. Pollard
Keyword(s):  
Synchronous Machines ◽  
Winding Loss ◽  
Damper Winding

scholarly journals Effect of Damper Winding and Stator Slot Skewing Structure on No-Load Voltage Waveform Distortion and Damper Bar Heat in Large Tubular Hydro Generator

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 22281-22291 ◽  
Author(s):  
Zhen-Nan Fan ◽  
Li Han ◽  
Yong Liao ◽  
Li-Dan Xie ◽  
Kun Wen ◽  
...  
Keyword(s):  
Voltage Waveform ◽  
Load Voltage ◽  
Waveform Distortion ◽  
Damper Winding

No-Load Voltage Waveform Optimization of Integral Number Slots Large Hydro-Generator by Shift Damper Winding

2013 ◽  
Vol 765-767 ◽  
pp. 8-12
Author(s):  
Hong Lian Wang ◽  
Zhen Nan Fan
Keyword(s):  
Electromagnetic Field ◽  
Coupling Model ◽  
Voltage Waveform ◽  
Load Voltage ◽  
Design Standard ◽  
Waveform Optimization ◽  
Integral Number ◽  
Damper Winding

In order to analyze the influence of integral-number slots large hydro-generator no-load voltage waveform by the damper winding shift schemes, the 2D moving electromagnetic field-circuit coupling model is established, and the no-load voltage waveforms of a 600MW integral-number slots hydro-generator are calculated and analyzed. The results show that the tooth harmonics are weakened and the waveforms of the no-load voltage are improved observably when damper winding shift scheme adopted. The research is helpful for improving design standard and enhancing the operation reliability of the large hydro-generator.

A Solid-State On-Load Tap Changer for the Power Transformers of 10—0.4 kV Distribution Networks

Vestnik MEI ◽  
2020 ◽  
Vol 6 (6) ◽  
pp. 82-90
Author(s):  
Dmitriy I. Panfilov ◽  
◽  
Mikhail G. Astashev ◽  
Aleksandr V. Gorchakov ◽  
◽  
...  
Keyword(s):  
Solid State ◽  
Physical Model ◽  
High Speed ◽  
Power Transformer ◽  
Voltage Control ◽  
Power Transformers ◽  
Control Algorithms ◽  
Load Voltage ◽  
Tap Changer ◽  
Load Tap Changer

The specific features relating to voltage control of power transformers at distribution network transformer substations are considered. An approach to implementing high-speed on-load voltage control of serially produced 10/0.4 kV power transformers by using a solid-state on-load tap changer (SOLTC) is presented. An example of the SOLTC circuit solution on the basis of thyristor switches is given. On-load voltage control algorithms for power transformers equipped with SOLTC that ensure high reliability and high-speed operation are proposed. The SOLTC performance and the operability of the suggested voltage control algorithms were studied by simulation in the Matlab/Simulink environment and by experiments on the SOLTC physical model. The structure and peculiarities of the used simulation Matlab model are described. The SOLTC physical model design and its parameters are presented. The results obtained from the simulating the SOLTC operation on the Matlab model and from the experiments on the SOLTS physical model jointly with a power transformer under different loads and with using different control algorithms are given. An analysis of the experimental study results has shown the soundness of the adopted technical solutions. It has been demonstrated that the use of an SOLTC ensures high-speed voltage control, high efficiency and reliability of its operation, and arcless switching of the power transformer regulating taps without load voltage and current interruption. By using the SOLTC operation algorithms it is possible to perform individual phase voltage regulation in a three-phase 0.4 kV distribution network. The possibility of integrating SOLTC control and diagnostic facilities into the structure of modern digital substations based on the digital interface according to the IEC 61850 standard is noted.

scholarly journals Hybrid Reference Current Generation Theory for Solar Fed UPFC System

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1527
Author(s):  
R. Senthil Kumar ◽  
K. Mohana Sundaram ◽  
K. S. Tamilselvan
Keyword(s):  
Neural Network ◽  
Power Factor ◽  
Reactive Power ◽  
Voltage Source ◽  
Unity Power Factor ◽  
Current Generation ◽  
Load Voltage ◽  
Reference Current Generation ◽  
Source Current

The extensive usage of power electronic components creates harmonics in the voltage and current, because of which, the quality of delivered power gets affected. Therefore, it is essential to improve the quality of power, as we reveal in this paper. The problems of load voltage, source current, and power factors are mitigated by utilizing the unified power flow controller (UPFC), in which a combination of series and shunt converters are combined through a DC-link capacitor. To retain the link voltage and to maximize the delivered power, a PV module is introduced with a high gain converter, named the switched clamped diode boost (SCDB) converter, in which the grey wolf optimization (GWO) algorithm is instigated for tracking the maximum power. To retain the link-voltage of the capacitor, the artificial neural network (ANN) is implemented. A proper control of UPFC is highly essential, which is achieved by the reference current generation with the aid of a hybrid algorithm. A genetic algorithm, hybridized with the radial basis function neural network (RBFNN), is utilized for the generation of a switching sequence, and the generated pulse has been given to both the series and shunt converters through the PWM generator. Thus, the source current and load voltage harmonics are mitigated with reactive power compensation, which results in attaining a unity power factor. The projected methodology is simulated by MATLAB and it is perceived that the total harmonic distortion (THD) of 0.84% is attained, with almost a unity power factor, and this is validated with FPGA Spartan 6E hardware.

Load voltage-based MPPT technique for standalone PV systems using adaptive step

2021 ◽  
Vol 128 ◽  
pp. 106732
Author(s):  
Vipin Kumar ◽  
Sandip Ghosh ◽  
N.K. Swami Naidu ◽  
Shyam Kamal ◽  
R.K. Saket ◽  
...  
Keyword(s):  
Load Voltage ◽  
Pv Systems ◽  
Adaptive Step

scholarly journals Analytical Modeling of High-Frequency Winding Loss in Round-Wire Toroidal Inductors

2020 ◽  
Author(s):  
David Elizondo ◽  
Ernesto L. Barrios ◽  
Pablo Sanchis ◽  
Alfredo Ursua
Keyword(s):  
High Frequency ◽  
Analytical Modeling ◽  
Winding Loss ◽  
Round Wire
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