Electrical compensation of reactive power is the best solution

SVGs compensate reactive power caused by inductive or capacitive loads. An SVG is sometimes called an active power factor compensator (APFC). The reason for this is that a SVG reactive power is provided by means of electronics, as opposed to traditional capacitor banks, which can only compensate in fixed step sizes due to the use of passive components.

The advantages of Static VAr generators (SVG):

  • Improve the lifespan of the installation and equipment by reducing loads and heat
  • Lower energy losses and a reduced energy bill
  • Reduced CO2 emissions
  • Works without fixed step sizes
  • Fast response time (ms)
  • Correction of unbalance is possible, preventing large neutral currents
  • Compact form factor
  • Compatible with installations that have high levels of harmonic voltage (THDu)
  • Suitable for large voltage variations
  • Better low voltage ride through compared to traditional capacitor bank

Always the right amount of compensation

Traditional capacitor bank response is stepped,which means there is almost always too little or too much compensation. A key advantage of an SVG is the fact that it provides exactly the right amount of reactive power at all times. The reaction time of an SVG is in the order of milliseconds. This means reactive inrush currents of motors can be fed, which reduces the chance of voltage dips.

An SVG is also capable of compensating capacitive grids - something a traditional capacitor bank cannot do. Unkike a traditional capacitor bank, an SVG can also compensate for capacitive grids. In today's office buildings and laboratories, the power grid is becoming increasingly capacitive due to the increased uptake of electronics, such as LED lighting, and the decreasing linear load.

Reactive power compensation by a static var generator
reactive power compensation with a capacitorbank

Robust compensation

An SVG is more durable then a capacitor bank, it is more resistant to changing circumstances such as voltage fluctuations, dips and harmonic voltages. A capacitor bank is very sensitive to harmonic voltages since it has a lower impedence at higher frequencies. What’s more, an SVG does not introduce any risk of creating resonance, which is always a risk when introducing a capacitor bank. Finally, an SVG can compensate current unbalance and ttherefore prevent voltage unbalance.

impedance of a static var generator compared to the impedance of a capacitorbank

One step further: taking out harmonics

An active filter can be seen as an SVG that is also capable of removing harmonic currents from the installation. An SVG is resistant to high levels of harmonic voltages. However, the other components in the installation are probably not. Harmonic voltages reduce the operational lifetime of electronic equipment. Active filters can also prevent other Power Quality issues such as Power Factor correction, reduction of harmonic currents, unbalance and short voltage dips.

HyTEPS is an expert in Reactive power compensation


Compensating reactive power is almost always a logical step. Making a choice between a traditional capacitor bank, SVG, AHF or another solution is the most difficult part.

HyTEPS has over 14 years of international experience in reducing reactive currents. We support you in finding the best solution for reducing your reactive power consumption.

Would you like to know more about our solutions and services? Contact us!

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