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    02A Loaddivision

    Uploaded by

    Yasir Abdoo
    The document discusses two methods for sharing load between engines running in parallel: speed droop and isochronous control. Speed droop control causes engine speed to decrease slightly as load increases, allowing proportional load sharing. Isochronous control uses electronic governors to maintain a constant speed regardless of load, allowing more precise load sharing. Precise voltage and speed matching is required to safely parallel multiple generator sets.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    02A Loaddivision

    Uploaded by

    Yasir Abdoo
    42 views19 pages
    The document discusses two methods for sharing load between engines running in parallel: speed droop and isochronous control. Speed droop control causes engine speed to decrease slightly as load increases, allowing proportional load sharing. Isochronous control uses electronic governors to maintain a constant speed regardless of load, allowing more precise load sharing. Precise voltage and speed matching is required to safely parallel multiple generator sets.

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    02A-loadDivision

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    The document discusses two methods for sharing load between engines running in parallel: speed droop and isochronous control. Speed droop control causes engine speed to decrease slightly as load increases, allowing proportional load sharing. Isochronous control uses electronic governors to maintain a constant speed regardless of load, allowing more precise load sharing. Precise voltage and speed matching is required to safely parallel multiple generator sets.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    42 views19 pages

    02A Loaddivision

    Uploaded by

    Yasir Abdoo
    The document discusses two methods for sharing load between engines running in parallel: speed droop and isochronous control. Speed droop control causes engine speed to decrease slightly as load increases, allowing proportional load sharing. Isochronous control uses electronic governors to maintain a constant speed regardless of load, allowing more precise load sharing. Precise voltage and speed matching is required to safely parallel multiple generator sets.

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    © All Rights Reserved
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    You are on page 1of 19

    Load Sharing between engines in parallel

    The capacity of a genset to accept load depends only on the fuel


    level, as the fuel is the primary energy source we use to produce
    the power.

    There are two basic systems to share the kW proportionally:

    • Speed Droop: The only way if at least one of the engines we are
    going to parallel is mechanic. We lose speed as the load increases and
    therefore the output frequency also decrease.

    • Isochronous: Only possible when all generators have electronic


    governors. With this system the speed and frequency remain constant.

    -1-
    Load division

    SPEED

    EE D
    SP

    X Y
    X=Y

    X X≠Y Y

    -2-
    Speed droop

    3% Speed droop 1545

    1522

    1500

    S
    p
    e
    e
    d

    100% Horsepower or Load


    0%

    -3-
    Same horsepower , same droop
    3% Speed droop
    1545

    1522

    1500

    S
    p
    e
    e
    d

    100% 50%
    0% 50%
    100%

    Horsepower or Load
    -4-
    Different horsepower , same droop
    3% Speed droop
    1545

    1522

    1500

    S
    p
    e
    e
    d

    100% 50%
    0% 50% 100%

    Horsepower or Load
    -5-
    Same Horsepower , different droop
    4% droop 3% droop
    1560
    1545

    1500

    S
    p
    e
    e
    d

    100% 0% 100%

    Horsepower or Load
    -6-
    Same HP different droop

    4% droop 3% droop
    1545

    1500
    1485

    S
    p
    e
    e
    d

    100% 0% 100%

    Horsepower or Load
    -7-
    One droop other isochronous
    3% droop 0% droop
    1545

    1500

    S
    p
    e
    e
    d

    100% 0% 100%

    Horsepower or Load
    -8-
    Preparing VOLTAGE for parallel
    operation
    - Run engine with no load at high idle (rated speed + droop%).
    - Adjust the system voltage with LEVEL pot.
    - Apply full load , verify the speed , adjust the voltage
    until it is equal to the no load voltage with the GAIN
    pot.

    When speed and voltage setting are correct put units in


    parallel and apply the load.

    Check the output current of every generator.


    The sum of individual generator amp should not be more
    then 10% over the load amp.

    -9-
    Sharing the load in equal %
    with speed droop
    Engines: Task:
    Eng #1 : 3508B 800 KW Adjust for equal % load
    Eng #2 : 3412 400 KW sharing operation

    50%

    Eng #1 Eng
    #2

    800KW 400KW
    400KW 200KW

    -10-
    Let’s do the load curve Engines:
    Eng #1 : 3508B 800 KW
    3412 kW Eng #2 : 3412 400 KW
    400 1200 kw

    300 x 900 kw

    200 x 600 kw

    100 x 300 kw

    0 3500 kW
    200 400 -11- 600 800
    Sharing the load in different %
    with speed droop Task:
    We want
    Engines: Eng#1: to support the first 100KW
    Eng #1 : 3508B 800 KW
    Eng#2: to share the load equally
    Eng #2 : 3412 400 KW from this point

    1500

    Eng #1 Eng #2
    800KW 700 500 300
    800 600 400 200
    -12- 100 0 100 200 300
    400KW
    Let’s do the load curve Engines:
    Eng #1 : 3508B 800 KW
    Eng #2 : 3412 100 KW
    3412 kW
    400 1200 kw

    300 x 925 kw

    200 x 650 kw

    100 x 375 kw

    0 3500 kW
    100 275 450 625 800
    -13-
    Load transfer
    Engines:
    Situation:
    Situation: Eng #1 : 3508B 800 KW
    Eng#1&
    Eng#1 & 22are
    are ““on the load
    on the load”
    ” Eng #2 : 3412 400 KW

    Wewant
    We wanttotoService
    ServiceEng#2
    Eng#2
    w/ocutting
    w/o cuttingthe
    thepower
    power..

    Eng #1 Eng #2

    800KW 400KW

    + +
    Speed pot Speed pot
    -14-
    Isochronous

    0% droop 0% droop

    Electric governor has the ability to sense the load


    and compare it to the load other units carry

    -15-
    0 speed droop

    Engine Generator
    PT CT
    Governor
    L
    O
    DC voltage
    A
    Parallel
    Load GAIN pot Lines D
    2301A Woodward
    Parallel
    Rated speed pot
    Lines 6VDC

    -16-
    0 speed droop
    Engine Generator
    PT CT
    Governor
    L
    O
    Parallel A
    Lines
    D
    2301A Woodward
    Summing
    point
    6VDC

    Generator Engine
    CT PT
    Governor

    2301A Woodward

    Summing

    6VDC
    point

    -17-
    0 speed droop

    6VDC
    3VDC
    0VDC

    Load
    Load
    0% 100%
    50%
    -18-
    0 speed droop

    6VDC 6VDC
    3VDC 3VDC
    0VDC 0VDC

    Load
    Load Load
    Load

    0% 100% 0%
    50% 50%

    -19-

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