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POWER FACTOR CORRECTION

Having an ideall system with 90% Power Factor systems increase the efficiency of power supply.

Power Factor Correction aims to improve power factor, by having causes of bad power factor such as inductive loads, transformer, power rectifiers and welding instruments offset by using capacitors and Power Factor Correction Controllers . The immediate result will be from cost savings on electricity and extending the lifespan and capacity of electrical appliances in your production assets while reducing downtime due to nuisance tripping of circuite breakers or fuses. 

WHY DO I NEED GOOD POWER FACTOR?!

Poor power factor has direct implications to your business. Low power factor penalties is one of the major challenge face by business. Having an ideal electrical system improves electrical infrastructure and equipment capacity and helps your operation to save money. 

Benefits of Power Factor Correction

With power factor equal to 1 or as close as possible, there are lower losses and all power generated is utilized efficiently.

  1. Increased System Capacity 
    Power factor correction frees up capacity on your supply transformer. Adding power factor correction capacitors allows you to add additional load to your system without altering the kVA.
  2. Improved Voltage Conditions
    Low voltage, resulting from excessive draw, causes motors to be sluggish and overheated. As power factor decreases, total line current increases, causing further voltage drop. By adding capacitors to your system and improving power factor, you will improve voltage and therefore get more efficient motor performance and longer motor life.
  3. Reduced Transmission Losses
    Losses caused by poor power factor are due to reactive current flowing in the system. These are watt-related charges that can be eliminated through power factor correction.
  4. Reduced Carbon Footprint
    Power factor correction reduces the total current drawn from an electrical distribution network (which affects systems such as the power stations, distribution grid, and supply transformers). In so doing, the heat or transmission losses incurred on these systems are reduced, which reduces your carbon footprint.

POWER FACTOR CORRECTION METHOD
(Passive VS Active)

The main difference between passive and active PFCs is simply the use of passive components versus using mostly active components with controller. Both can achieve power-factor corrections at different levels depending on the design efficiency, cost, and topology. Below is a simple comparison between both. 

PASSIVE PFC - Capacitor Bank
Power factor can be improved by either increasing the active power component or reducing the  reactive component. Reactive power from a capacitor bank is commonly used to improve power factor to unity. However, capacitors has low impedence and easily affected if harmonics is present in the system.

ACTIVE PFC - Active Harmonic Filter
AHF works as a controlled current source providing any kind of current waveform in real time. AHFs monitor the currents of the load and compensate any produced harmonic currents by generating a compensation current for each selected harmonic order in phase opposition to the harmonic current. . It addresses harmonics from a system point of view and can save  significant cost/space in many applications. 


PASSIVE PFC
⦾ Simple and rugged circuitry
⦾ Cost-effective at low power circuit
⦿ Not able to completely correct non-linear loads
⦿ Bulky and heavy magnetics required
⦿ Not a source of EMC
⦿ Control by steps
⦿ Response time 5-10 mins

ACTIVE PFC
⦾ Small and light components
⦾ High Power Factor = 0.99 
⦾ Comply with IEC61000-3-2
⦾ Great flexibility and control
⦾ Good EMC characteristics
⦾ Stepless Control
⦾ Response time <200us

Power Factor Correction

Making sure we are using power effeciently.