scholarly journals Hamiltonian model-based H control of chaos in permanent magnet synchronous generators for wind power systems

2012 ◽  
Vol 61 (6) ◽  
pp. 060506
Author(s):  
Ren Li-Na ◽  
Liu Fu-Cai ◽  
Jiao Xiao-Hong ◽  
Li Jun-Yi
Keyword(s):  
Power Systems ◽  
Permanent Magnet ◽  
Wind Power ◽  
Synchronous Generators ◽  
Control Of Chaos ◽  
Model Based ◽  
Permanent Magnet Synchronous Generators ◽  
Hamiltonian Model ◽  
Wind Power Systems

Operation Characteristics of Zone 3 Distance Protection in Wind Power Systems with Fixed-Speed Induction Generators

2011 ◽  
Vol 12 (4) ◽  
Author(s):  
Shenghu Li
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Reactive Power ◽  
Flow Analysis ◽  
Load Flow ◽  
Synchronous Generators ◽  
Induction Generators ◽  
Load Flow Analysis ◽  
Wind Power Systems ◽  
Operation Characteristics

The induction generators (IGs) are basic to wind energy conversion. They produce the active power and consume the reactive power, with the voltage characteristics fragile compared with that of the synchronous generators and doubly-fed IGs. In the stressed system states, they may intensify var imbalance, yielding undesirable operation of zone 3 impedance relays.In this paper, the operation characteristics of the zone 3 relays in the wind power systems is studied. With the theoretical and load flow analysis, it is proved that the equivalent impedance of the IGs lies in the 2nd quadrature, possibly seen as the backward faults by the mho relays, i.e. the apparent impedance enters into the protection region from the left side. The undesirable operation may be caused by more wind power, larger load, less var compensation, and larger torque angle.

Arc-Shaping of Magnets for Reduction of Cogging Torque in Permanent-Magnet Synchronous Generators

2012 ◽  
Vol 516-517 ◽  
pp. 1746-1750
Author(s):  
Chao Yuan Cheng ◽  
Chun Yu Hsiao ◽  
Shu Wei Chung ◽  
Chun Pin Chiang ◽  
Zai Wei Chin
Keyword(s):  
Power Systems ◽  
Permanent Magnet ◽  
High Efficiency ◽  
Daily Life ◽  
Optimized Design ◽  
Synchronous Generators ◽  
Cogging Torque ◽  
Permanent Magnet Synchronous Generators ◽  
Green Power ◽  
Determining Factors

Wind power is an important source of green power. The equipment, generators, and power systems are all determining factors of equipment efficiency. High efficiency generators of medium and small size are widely used in daily life. Cogging torque is a major issue affecting generator efficiency. This paper proposes an optimized design for permanent-magnet synchronous generators using arc-shaped magnets to reduce cogging torque. The proposed approach improves performance significantly.

Multipolar permanent-magnet synchronous generators intended for wind power plants

2012 ◽  
Vol 59 (14) ◽  
pp. 1035-1043
Author(s):  
L. K. Kovalev ◽  
K. L. Kovalev ◽  
Ye. Ye. Tulinova ◽  
N. S. Ivanov
Keyword(s):  
Permanent Magnet ◽  
Wind Power ◽  
Power Plants ◽  
Synchronous Generators ◽  
Permanent Magnet Synchronous Generators ◽  
Wind Power Plants
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