9.8 Compensation devices at fundamental and harmonic frequencies

One of the main responsibilities of a utility system is to supply electric power in the form of sinusoidal voltages and currents with appropriate magnitudes and frequency for the customers at the points of common coupling (PCC). Design and analysis of system equipment and user apparatus are based on sinusoidal current and voltage waveforms with nominal or rated magnitudes and frequency. Although the generated voltages of synchronous machines in power plants are nearly sinusoidal, some undesired and/or unpredictable conditions – such as lightning and short-circuit faults – and nonlinear loads cause steady-state and/or transient voltage and current disturbances. For example, electric ...

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