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POWER HARMONIC FILTER DESIGN - Coggle Diagram
POWER HARMONIC FILTER DESIGN
PASSIVE FILTERS
Passive or Line harmonic filters (LHFs), also known as harmonic trap filters, are used to remove or regulate more prominent lower order harmonics, notably the 5th, 7th, 11th, and 13th harmonics.
It can be used as a freestanding component integral to a big nonlinear load (such as a 6-pulse drive) or connected to a switch board to power many modest 1-nonlinear loads.
LHF is made up of a passive L-C circuit (along with a resistor R for dampening) that is set to a certain harmonic frequency that has to be reduced (for example, 5th, 7th, 11th, 13th etc).
The filter operates by lowering the system's parallel resonance frequency to a value less than the lowest-order harmonic term of the load equipment.
By adding a series reactor to an existing power factor correction capacitor bank, it may be transformed to a filter bank.
ACTIVE FILTERS
Active filters, also known as active harmonic conditioners (AHC), eliminate harmonics by injecting precisely equivalent harmonic currents where they occur.
The source only provides the fundamental component (IF) of the load current (IL). The active conditioner measures and supplies the harmonics (Ih) drawn by the load in real time.
INSTALLATION MODES
PARALLEL MODE
CASCADE OR IN-SERIES MODE
MULTI-CIRCUIT MODE
ADVANTAGES OF AHC
Upgradeable with parallel-connected units
Can be reused in other installations
Very compact
Economic, when harmonics are cut in half, losses are reduced by four
Simple installation, with current transformers upstream or downstream
Power factor correction