+ All Categories
Home > Documents > Power Factor Correction (1)

Power Factor Correction (1)

Date post: 07-Apr-2018
Category:
Upload: john-kevin-sarmiento
View: 225 times
Download: 0 times
Share this document with a friend

of 44

Transcript
  • 8/3/2019 Power Factor Correction (1)

    1/44

  • 8/3/2019 Power Factor Correction (1)

    2/44

    Power Electronics 1 (ELAE210E)

    Emerson Power Elec Scholars Batch 16

    Engr. Ernesto Vergara

    Instructor

  • 8/3/2019 Power Factor Correction (1)

    3/44

    1 Power factor in linear circuits

    Definition and calculation

    Importance of power factor in distribution systems

    2 Power Factor Correction for Linear Loads3 Power Factor Correction for Non-linear Loads

    Non-sinusoidal components

    2.2 Distortion power factor

    2.3 Switched-mode power supplies

    2.4 Power factor correction in non-linear loads

    2.4.1 Passive PFC

    2.4.2 Active PFC

  • 8/3/2019 Power Factor Correction (1)

    4/44

    The product of the RMS voltage and RMS current.

    Measured in VA.

    S = Vrms*IrmsS = P + jQ

    S = P/cos() S = Q/sin()

  • 8/3/2019 Power Factor Correction (1)

    5/44

    The actual power dissipated by the load. Measured

    in Watts.

    P = S*cos()P = Q/tan()

  • 8/3/2019 Power Factor Correction (1)

    6/44

    It is the measure of the exchange of power

    between the source and the load. Measured in

    VAR.

    Q = S*sin()

    Q = Ptan()

  • 8/3/2019 Power Factor Correction (1)

    7/44

    The power factor of an AC electric power

    system is defined as the ratio of the real

    power consumed by the load to the total

    apparent power drawn by the circuit, and is adimensionless number between 0 and 1

    pf = cos()

  • 8/3/2019 Power Factor Correction (1)

    8/44

  • 8/3/2019 Power Factor Correction (1)

    9/44

  • 8/3/2019 Power Factor Correction (1)

    10/44

    The process of increasing the power factor without

    altering the voltage or current to the original load.

    Q = P[tan(1) tan(2)]

  • 8/3/2019 Power Factor Correction (1)

    11/44

    Reduces effective capacity of power supply

    -more reactive power = less real power

    Penalties for poor pf

    -reactive power charges

    -increased kWhr charges

    Systems Losses

    -transformer-increased CO2 emissions

    -equipment life cycle

  • 8/3/2019 Power Factor Correction (1)

    12/44

    Removal of reactive power charges

    Reduce cost of electricity

    Improve supply efficiency

    Reduced CO2 emissions

  • 8/3/2019 Power Factor Correction (1)

    13/44

    Apparent Power

    RealPowerBoat

    Horse

    Reactive Power = 0

    0

  • 8/3/2019 Power Factor Correction (1)

    14/44

    BoatRealPower

    Horse

    Reactive Power

    Apparent Power

    1

  • 8/3/2019 Power Factor Correction (1)

    15/44

    Apparent Power

    RealPowerBoat

    Horse

    2Reactive Power

  • 8/3/2019 Power Factor Correction (1)

    16/44

  • 8/3/2019 Power Factor Correction (1)

    17/44

  • 8/3/2019 Power Factor Correction (1)

    18/44

  • 8/3/2019 Power Factor Correction (1)

    19/44

    When connected to a 120Vrms 60Hz power-line, a

    load absorbs 4kW at a lagging power factor of 0.8.Find the value of capacitance necessary to raise the

    pf to 0.95.

  • 8/3/2019 Power Factor Correction (1)

    20/44

  • 8/3/2019 Power Factor Correction (1)

    21/44

    Traditional methods of Power Factor Correction

    typically focus on Displacement Power Factor

    and therefore do not achieve the total energy

    savings available in facilities having both linearand nonlinear loads. Only through Total Power

    Factor Correction can the savings and power

    quality be maximized.

  • 8/3/2019 Power Factor Correction (1)

    22/44

  • 8/3/2019 Power Factor Correction (1)

    23/44

    AC electrical loads where the voltage and

    current waveforms are sinusoidal. The

    current at any time is proportional to

    voltage.

    Examples of Linear Loads are:

    Power Factor Improvement Capacitors

    Incandescent Lamp

    Heaters, etc

  • 8/3/2019 Power Factor Correction (1)

    24/44

    AC loads where the current is not proportionalto the voltage. The nature of non-linear loadsis to generate harmonics in the currentwaveform. This distortion of the current

    waveform leads to distortion of the voltagewaveform. Under these conditions, the voltagewaveform is no longer proportional to thecurrent.

    Non Linear Loads are : COMPUTER, LASER PRINTERS, SMPS, REACTIFIER,

    PLC,

    ELECTRONIC BALLAST, REFRIGERATOR, TV ETC.

  • 8/3/2019 Power Factor Correction (1)

    25/44

    Generation of HARMONICS in Current Waveform

  • 8/3/2019 Power Factor Correction (1)

    26/44

    Generation of HARMONICS in Current Waveform

  • 8/3/2019 Power Factor Correction (1)

    27/44

    Generation of HARMONICS in Current Waveform

  • 8/3/2019 Power Factor Correction (1)

    28/44

    Generation of HARMONICS in Current Waveform

  • 8/3/2019 Power Factor Correction (1)

    29/44

    Generation of HARMONICS in Current Waveform

  • 8/3/2019 Power Factor Correction (1)

    30/44

    Recall: FOURIER SERIES

  • 8/3/2019 Power Factor Correction (1)

    31/44

    Total power Factor

    Displacement Power Factor

    Distortion Power Factor

  • 8/3/2019 Power Factor Correction (1)

    32/44

  • 8/3/2019 Power Factor Correction (1)

    33/44

  • 8/3/2019 Power Factor Correction (1)

    34/44

  • 8/3/2019 Power Factor Correction (1)

    35/44

  • 8/3/2019 Power Factor Correction (1)

    36/44

  • 8/3/2019 Power Factor Correction (1)

    37/44

  • 8/3/2019 Power Factor Correction (1)

    38/44

  • 8/3/2019 Power Factor Correction (1)

    39/44

  • 8/3/2019 Power Factor Correction (1)

    40/44

    Power Factor

    Real Power

    Apparent Power

    Reactive PowerHarmonics

  • 8/3/2019 Power Factor Correction (1)

    41/44

  • 8/3/2019 Power Factor Correction (1)

    42/44

  • 8/3/2019 Power Factor Correction (1)

    43/44

  • 8/3/2019 Power Factor Correction (1)

    44/44


Recommended