IEEE 519
Improving Energy Efficiency
HARMONICS CONTROL IN ELECTRICAL POWER SYSTEMS
Due to the increasing usage of non-linear loads such as VFDs, harmonics are being introduced into the power grid which is contributing to poor power quality and leads to overheating of equipment and nuisance faults. Active Harmonic Filters are parallel devices that are used to mitigate harmonics to the levels defined by IEEE-519.
Wise Power AHF utilizes high frequency current sensors to continuously monitor the load and harmonic currents. By utilizing highly sophisticated software and a powerful DSP microcomputer, the system is able to instantaneously inject a corrective current from its IGBT based inverter to dramatically reduce harmonic distortion. The corrective current is equal to but 180 degrees out of phase with the existing harmonic currents to cancel their effect.
DYNAMIC MITIGATION
HARMONICS
Wise Power AHF can mitigate 2nd to 50th harmonics compensation, compensation ratio can be set selectively by the customers, output compensation current follows the system harmonic variation, devoted to green power quality.
Different loads generate variety harmonics content which changes dynamically during different working conditions.
Wise Power AHF can also work as a capacitor bank and provide Power Factor correction to the electrical system.
UTILIZING FAST
FOURIER TRANSFORM
A Fast Fourier transform (FFT) is an algorithm that computes the Discrete Fourier transform (DFT) of a sequence, or its inverse (IDFT). Fourier analysis converts a signal from its original domain (often time or space) to a representation in the frequency domain and vice versa.
Investigation of harmonics has been carried out using Fast Fourier Transform (FFT) to evaluate the Total Harmonic Distortion (THDi)
