Harmonic Balance Finite Element Method: Applications in by Junwei Lu, Xiaojun Zhao, Sotoshi Yamada PDF

By Junwei Lu, Xiaojun Zhao, Sotoshi Yamada

ISBN-10: 1118975766

ISBN-13: 9781118975763

ISBN-10: 1118975782

ISBN-13: 9781118975787

The first e-book using HBFEM to functional digital nonlinear box and circuit problems 

• Examines and solves vast elements of functional electric and digital nonlinear box and circuit difficulties offered via HBFEM
• Combines the newest examine paintings with crucial historical past wisdom, offering an all-encompassing reference for researchers, energy engineers and scholars of utilized electromagnetics analysis
• There are only a few books facing the answer of nonlinear electrical- power-related problems
• The contents are in response to the authors’ decades’ study and adventure; they method the topic in a well-designed and logical way
• it truly is anticipated that HBFEM becomes a extra invaluable and functional procedure over the subsequent five years as a result of HVDC energy procedure, renewable strength process and clever Grid, HF magnetic utilized in DC/DC converter, and Multi-pulse transformer for HVDC strength supply
• HBFEM grants powerful and financial options to R&D product development
• comprises Matlab exercises

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Extra info for Harmonic Balance Finite Element Method: Applications in Nonlinear Electromagnetics and Power Systems

Sample text

5 24 Harmonic Balance Finite Element Method • Capacitor bank failure from dielectric breakdown or reactive power overload. • Interference with ripple control and power line carrier systems, causing operational failure of systems which accomplish remote switching, load control, and metering. • Excessive losses in – and heating of – induction and synchronous machines. • Over-voltages and excessive currents on the system from resonance to harmonic voltages or currents on the network. • Dielectric breakdown of insulated cables resulting from harmonic over-voltages on the system.

Switching loads on and off during part of the waveform results in short, abrupt, non-sinusoidal current pulses during a controlled portion of the incoming peak voltage waveform. These abrupt pulsating current pulses introduce unanticipated reflective currents (harmonics) back into the power distribution system. As mentioned earlier, these currents operate at frequencies other than the fundamental 50/60 Hz. The harmonics problem in electrical circuits has been an issue since the establishment of the AC generators, where distorted voltage and current waveforms were observed in 20th century.

Increased risk of system voltage collapse. Transformer heating. Increased risk of transformer damage. Adding a small DC offset in the flux may cause a power transformer to enter halfcycle saturation, which greatly distorts the current waveform [21]. 22(b). At normal operation, practically the entire linear range of the magnetizing characteristic around the origin is used. Only a small DC offset is then needed to shift operation into the saturated part of the characteristic and, as this occurs only at the upper or lower part of the sinusoidal waveform, it is distorted in only one of the half-cycles.

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Harmonic Balance Finite Element Method: Applications in Nonlinear Electromagnetics and Power Systems by Junwei Lu, Xiaojun Zhao, Sotoshi Yamada

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