PURESINE Three Phase Passive Harmonic Filters from EMIS
When it comes to maintaining power quality in their devices, VFD manufacturers prefer to use Passive Harmonic Filters to suppress harmonic currents and decrease voltage distortion occurring in the sensitive parts of the power system. With the growing use of VFDs in distributed power generation, a critical problem emerges – harmonic distortion.
- (1888PressRelease) October 08, 2021 - PURESINE Three Phase Passive Harmonic Filters from EMIS - A popular choice of VFD manufacturers worldwide
When it comes to maintaining power quality in their devices, VFD manufacturers prefer to use Passive Harmonic Filters to suppress harmonic currents and decrease voltage distortion occurring in the sensitive parts of the power system.
With the growing use of VFDs in distributed power generation, a critical problem emerges – harmonic distortion. If generated harmonics get injected into the grid, it can cause malfunctioning of sensitive equipment connected on the same line. The use of well-designed harmonic filters can mitigate this critical risk.
PURESINE Three Phase Passive Harmonic Filters from EMIS are a popular choice among VFD manufacturers worldwide. They provide an economical solution for Harmonic mitigation in Power Systems by maintaining THiD 5% in compliance with current and voltage requirements of IEEE 519.
Harmonic Distortion and its impact
Harmonics are current and voltage waveform distortions in power supply. Harmonics occur in integer multiples of the fundamental (supply) frequency - 50 Hz in India/Europe, 60 Hz in North America.
A distorted waveform creates heat in the power delivery equipment that can cause severe damage to both domestic and industrial equipment using the utility power supply. Harmonics are created due to the presence of non-linear loads which draw non-sinusoidal currents from an essentially sinusoidal voltage source. This leads to corruption of the supply voltage in the main power lines.
There are several nonlinear equipment sources that can potentially trigger harmonics in the line, affecting all other connected devices. These devices include rectifiers, inverters, electronic starters and battery chargers, home appliances, SMPS, office automation devices and so on. Since such devices are a dominant part of our industrial and home environment, harmonic distortions are inevitable. Therefore, necessary corrective action has to be taken at the design level itself.
Total harmonic distortion (THD) is a measurement that tells you how much of the distortion of a voltage or current is due to harmonics in the signal. THD should typically(not always) be as low as possible. The acceptable threshold of THD is under 10%, and varies according to the application. The total harmonic distortion for voltage and current are represented as THvD and THiD respectively.
Harmonic distortion may impact power quality in several ways:
Distorts the sine wave shape of the fundamental on the grid. Increased Harmonics increases the phase angle difference between Voltage and Current.
As the grid has protection equipment, harmonics may give false triggers.
Increases heating losses, torque pulsations
Affects life of the equipment connected to the grid
Can cause overheating, resulting in a potential fire hazard
Can result in irregular fuse operation, capacitor failure, electronic equipment malfunction, flickering lights and telephone interference
Voltage Harmonics with high peak values can weaken insulation in cables, windings and capacitors
Current Harmonics in motor windings can create Electromagnetic Interference (EMI)
Use of Harmonic Filters - simple and effective
Active harmonic filters are very effective for systems that have multiple loads, but are expensive, complex and space consuming. On the other hand, Passive harmonic filters offer a rugged, inexpensive, low maintenance option. They are typically L-C filters installed in a shunt arrangement on the line side of the inverter. They are tuned to resonate at a single frequency or through a band of frequencies. They could be tuned somewhat below the 5th harmonic, which is the largest component of harmonic distortion. A significant amount of 7th harmonic distortion will also be absorbed. Additional filters tuned to higher order harmonics may also be used.
PURESINE Three Phase Passive Harmonic Filters from EMIS
Three Phase Passive harmonic filters from EMIS are designed and manufactured to provide an economical and sturdy solution for harmonic mitigation in power systems. These filters effectively maintain THID 5% in compliance with current and voltage requirements of IEEE 519.
Passive harmonic filters being a harmonic absorption type, absorbs the harmonics from both downstream as well as upstream within its range. Thus they prevent the current harmonic from circulating and getting absorbed within the equipment and also stop it from flowing back to the upstream power grid.
They are effective in suppressing harmonic currents and decreasing voltage distortion occurring in the sensitive parts of the Power system. Their primary advantages include:
Consistently maintain THD under 5%
Rugged, low cost, low maintenance
Very effective in reducing losses
Prevents overheating of components
Prevents transformer failures
Eliminates nuisance tripping of circuit breakers
High attenuation of individual harmonics
Help in the power factor correction
Specifications and standards compliance with UL 61800-5-1, IEEE-519
Apart from application in inverter systems, Passive harmonic filters can also be used in various kinds of adjustable speed drive systems, SMPS, DC chargers, UPS, power grids, pumps and fan applications, HVAC, and other industrial automation systems.
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