power management.pdf

8/13/2019 Power Management.pdf

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1KONGSBERG June 2, 2008

POWER MANAGEMENTUnderstanding the construction and operating

the Power Management

AIM2000 ver. 7.3.x


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Power Management

Generator: symbol, text, instrument panel

Bus tie

SwitchBoardload -andconsumercontrol

Emergencygenerator- not

operational

Heavyconsumers- not

operational

Schematic overview of power production and distribution

Generators load mode

Description in line 1 in the generator symbol

The generators operate in one of four modes:

Manual: All operations are done by the operator

Symmetric: Shares the load equally between the

generators

Asymmetric: Shares the load unequally between the

generators. Main generator takes 80% of its maximum

load.

Fix: Sets the load at the level shown when thecommand is executed


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The generators can be in standby or not-standby mode

Not-standby generators are excluded fromthe automatic operation sequencecontrolled by the SVC

Standby generators are ready foractivating

All standby generators have a standbynumber which determines the order of

automatic operation

The generators are started in ascendingorder and stopped in descending order

Generators control mode


Start/stop-sequences are shown

Typical states are CONNECTED, STOPPED,REDUCE LOAD and STOPPING


BLOCKED Must be reset to remove the block

INHIBIT Operations are inhibited because values are

missing or out of range


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The generator operation menu

Click on a button to operate

To set a generator in standby mode:Enter a standby number in the dialogbox

STOP The generator must be disconnected before stopping

START The generator must be disconnected before starting

DISCONNECT The generator must be disconnected before stopping

CONNECT The generator must be running before connection

STANDBY Sets the generator in standby mode.

A dialog box for entering a standby number appears.

NOT STBY Sets the generator in not-standby mode

INCREASE Incr the load in manual mode, setp in fixed load

DECREASE Decr the load in manual mode, setp in fixed loadMANUAL Selects the manual mode for the generator

FIX Selects the fixed load for the generator

SYMMETRIC Selects the symmetric load for the generator

ASYMMETRIC Selects the asymmetric load for the generator

RESET Resets a blocked generator


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Switch Board

The SB manages the distribution net andload sharing

One SB can manage up to 4 generators

Several SBs can be connected with bustie breakers

Several SBs connected operate as oneunit

Bustiebreaker

The symbol consists of:

BUS TIE: A thick, green line below the generator symbol

INSTRUMENT PANEL: The panel shows current load,

available load and SB modes.

OPERATION MENU: Click the left mouse button when

pointing at the value of load or available load on the

instrument panel

POP UP MENU: Click the right mouse button when

pointing at the thick green line


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Load dependent start/stop

- One or more generators must be in standby mode

- Load dependent start/stop can be initiated when limits in kW or %

are reached (% in this example)

- Load dependent start/stop is delayed to prevent start/stop signals

on temporary variations

- Load dependent start can have two limits: one with low level and long

time and one with high value and short time.

Number of

connected DDGs

Start

limit 1

Start

limit 2

Stop

limitDelay Delay Delay

1 84% 30s 90% 10s - -2 86% 30s 91% 10s 70% 15min

3 88% 30s 92% 10s 70% 15min

4 - - - - 70% 15min

Example:

Each generator max load 2400 kW.

2 generators are running. At what load do one more generator start?

2 x 2400 kW x 86% = 4128 kW in more than 30 sec or

2 x 2400 kW x 91% = 4368 kW in more than 10 sec.

What is the load when one of the 3 running generators stop?

2 x 2400 kW x 70% = 3360 in more than 15 min

power management.pdf

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