KWU Electro Hydraulic Governing Final1

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KWU Electro-Hydraulic

governing

Governor is a device to control speed /load

to a set point.

Type: Hydraulic & Electro-hydraulic

Advantages & disadvantages

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ADVANTAGES OF EHC

•

• _{i) Increases the life of turboset by conservative}

_{i) Increases the life of turboset by conservative}

operation with the aid of TSE

•

• _{ii) Reliable operation of isolated power grid by}

_{ii) Reliable operation of isolated power grid by}

Automatic Switchover of the load controller to

frequency control.

•

• _{iii) Precise maintenance of the rated frequency of the}

_{iii) Precise maintenance of the rated frequency of the}

pow

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kwu

•• EHC can be divided into following sub-sections:

EHC can be divided into following sub-sections:

•• 1

1 Speed measurement and Speed controller

Speed measurement and Speed controller

•

• ₂

₂

_L

_oa

_d

_c

_o

_n

_tr

_ol

_le

_r

_a

_n

_d

_L

_oa

_d

_m

_e

_a

_su

_re

_m

_e

_n

_t

•

• ₃

₃

_Pressure

_controller

•

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2790

2

9

4

0

3

0

6

0

3

2

1

0

0 RPM

RPM

output

+100%

0%

Droop

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What is Droop?

% of frequency change ( % of RPM change)

will

will lead

lead to

to full

full travel

travel of

of Governing valves

Governing valves or

or

full load change.

5% droop means: 5%*50 Hz= 2.5 Hz

Will change 500MW. In terms of output total

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0

0 +100%

+100%

TURBINE DROOP 5% & NO DEAD BAND

-100%

-150 RPM

_{+150 RPM}

3000

RPM

2850

2700

₃₁₅₀

+300

3300

2790

+100%

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1a Speed measurement

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1b S

peed Controller

•

• _{Speed Controller}

_{Speed Controller}

_{is used to increase turbine speed}

from barring speed to rated speed in a controlled

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Speed controller can be divided into sub section:

Speed set point,

Speed set point control, Dn/Dt monitoring,

Speed control Loop, No load correction

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b) Speed Set Point c

ontrol

•

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c) Dn/Dt MONITORING

•• A

A Sp

Spee

eed c

d con

ontr

trol

olle

ler ou

r outp

tput

ut (h

(hr n c

r n c) s

) sho

houl

uld b

d be m

e mor

oree

than 0.0 V (with a time delay of 10 seconds)

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LOAD SHEDDING RELAY

•

• _{LOAD shedding relay}

_{LOAD shedding relay}

_{is used to support the function of}

the turbine governor. A quick correction value input to

the hydraulic governor output & secondary oil pr. of

IPCV min speed building

•• When acceleration time constant is very small or when

When acceleration time constant is very small or when

governor under load or pressure control.

•• Sudden negative jump in load is detected electrically

Sudden negative jump in load is detected electrically

instantaneously by the load shedding relay

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EHC: SPEED C

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EHC: Load controller

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SUMMER

ACTUALPR –SET

THROTTLE PR.

10 KSC

INITIAL PR. MODE

PI CONTR

LOAD CONT

MIN

_CONT.

PI

EHC

CONV

MIN

COLLINS

CONTROL TRANSFER

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LOAD SHEDDING RELY SOLENOID VALVES IN OIL CI

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For example :- Turbine running at 3000 rpm

Output of speed

controller at

(50Kg/C

m2)=1.5V

Output of speed

controller at

(150Kg/Cm

2)=0.8V

The pr

essure transm

itter ranges

is

0=250K

g/Cm2

= 0-10

V

for 4

to 20mA

The correction input as given with a

gain of 0.05 and the overall gain of speed controller l

oop is

so net g

ain for

correction signal

=0.05x2

2.22=1.11

Hence correction input required at

50Kg Cm

2 =1.5/1.11 =1.35v and correction input required at

Y=m x +C Y= Correction Signal

X = Pressure

Signal ( 50 kg/cm2=2v, 150 kg/cm2=6v

)

1.35=M

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