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UPS SIZING

OLEH:

BAGUS PRAHORO TRISTANTIO

ELECTRICAL DIVISION

INDUSTRIAL PLANT DEPARTMENT

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TUJUAN

Memilih komponen yang sesuai dengan

ratingnya. Adapun komponen yang akan

digunakan adalah rectifier, battery banks, dan

inverter.

Menjamin ketersediaan daya baik untuk

beban-beban sensitive maupun beban-beban

kritis.

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UPS

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BATTERY CHARGER

Dropper diode

Battery bank

Rectifier

(Charger)

Input

Switching

device

Dist.

board

Blocking diode

Output

Switching

device

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Apa saja yang dibutuhkan?

UPS loads that need to be supported

Input / Output AC voltage

Autonomy time(s) Battery type

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Langkah-langkah Sizing

Mengumpulkan beban-beban yang akan

disupply oleh UPS system

Membuat load profile dan menentukan

kapasitas dari UPS system

Menentukan kapasitas baterai yang akan

digunakan

Menentukan kapasitas inverter, rectifier, dan

static switch.

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LANGKAH 1

Menentukan beban beban yang akan disupply.Beban-beban yang akan disupply biasanyamerupakan beban instrument dan control.

1. Instrumen dan control yang meliputi DCS,ESD, F&D, dan H2S Syatem

2. Telecom and communication system

3. PLC Package

4. Control and monitoring facilities sepertiSCADA, PMS dan lain sebagainya.

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LANGKAH 2

Menentukan load profile dengan

mengutamakan design load dan juga design

energy yang akan digunakan.

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LANGKAH 3

Battery sizing dilakukan dengan langkah-

langkah sebagai berikut :

1. Menentukan DC output dari battery

2. Menentukan DC input voltage dari inverter

3. Menentukan jumlah cell yang akan

digunakan4. Menentukan DC link current

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Rumus-rumus umum

Mengacu pada IEEE std 485 (1997 rev2003)

dan IEEE std 1115 (2000 rev2005)

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RUMUS JUMLAH CELL

Nmaxis the maximum number of battery cells

Nminis the minimum number of battery cells

Vdcis the nominal battery / DC link voltage (Vdc)

Vi,maxis the inverter maximum input voltage tolerance (%)Vi,minis the inverter minimum input voltage tolerance (%)

Vfis the nominal cell float (or boost) voltage (Vdc)

Veodis the cell end of discharge voltage (Vdc)

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Kapasitas Baterai

is the minimum battery capacity (Ah)

is the design energy over the autonomy time (VAh)

is the nominal battery voltage (Vdc)

is a battery ageing factor (%)is a temperature correction factor (%)

is a capacity rating factor (%)

is the maximum depth of discharge (%)

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CORRECTION FACTOR

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Rectifier Sizing

DC load current

IL,dcis the design DC load current(full load) (A)

Sis the selected UPS rating (kVA)

Vdcis the nominal battery / DC linkvoltage (Vdc)

Maximum battery charger

Icis the maximum DC charge current (A)

Cis the selected battery capacity (Ah)

klis the battery recharge efficiency / lossfactor (typically 1.1) (pu)

tcis the minimum battery recharge time(hours)

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Inverter Sizing

Three Phase

ILis the design AC load current (full

load) (A)

Sis the selected UPS rating (kVA)

Vois the nominal output voltage (line-

to-line voltage for a three phase UPS)

(Vac)

Single Phase