strategic planning for nablus power system

Strategic planning for Nablus power

system

Prepared by: Aya Kamal Alawneh Amal Nazzeh Allan

Presented to: Dr. MAHER KHAMMASH

• Our project is to make a load flow study and analysis for MojeerAldeen& Aljam3a and Kamal jomblat (Nablus) Electrical Network using ETAP software

- to improve the power factor- to reduce the electrical losses in the network- to increase the capability of the transformers and

the transmission lines

Outlines

Nablus electrical network

Electrical Network Improvements

1.1 Simulation For Mojeer Al deen Network fed from Quseen

1.1.1 FOR MAXIMUM CASE

Max. load case results with improvement

MW Mvar MVA % PF

Swing

Bus(es):

7.597 2.616

8.03 94.55Lag

Apparent

Losses:

0.098 0.631

∆P% 1.29

Max. load case results without improvement

MW Mvar MVA % PF

Swing

Bus(es):7.8 2.8 8.2 88.8 lag

Apparent

Losses:0.122 0.71

∆P% 1.56


V% Mojeer Al deen Network from Quseen(max)

1.05 Vnominal <V<1.1 Vnominal


PF for Mojeer al deen from QuseenMax case


• 1.1.2 FOR MINIMUM CASE• we reduce the loads to 40% from the original case

Min. load case results without improvement

MW Mvar MVA % PF

Swing

Bus(es):2.902 1.476 3.255 89.14 lag

Apparent

Losses:0.017 0.058

∆P% 0.586

Min. load case results with improvement

MW Mvar MVA % PF

Swing

Bus(es):2.8 1.015 3.131 94.59 lag

Apparent

Losses:0.015 0.054

∆P% .541


• 1.1.3 The economical study

• ∆∆P=∆Pbefore,cap - ∆Pafter,cap∆∆P:saving in real power losses∆Pbefore,cap : real power losses before adding capacitor ∆Pafter,cap : real power losses after adding capacitor

Z∆p=∆∆p*T*100Z∆p : annual saving in real power cost

• T max =the time of max loss = 3800 h 100:cost per MWh($/MWh)

Kc=C*QcKc :cost of capacitorC: cost of capacitor per KVAr($/KVAr)Qc: capacitor KVAr


• Fixed Cap=4000($/MVAr). Regulated Cap= 10000 ($/MVAr)

Zc =0.22*KcZc :annual capacitor running cost0 .22: maintenance & life time of capacitor (depreciation factor)

∆Z=Z∆p-Zc∆Z: annual saving

S.P.B.P=investment(capacitors initial cost)/ total annual savingS.P.B.P < 2year →→→project is visible S.P.B.P > 2year →→→project is not visible


• ∆∆P=saving in real power losses ==∆Pbefore-∆Pafter=0.024

Z∆p= annual saving in real power cost ==∆∆p*T*100== T=the time of max loss $/MWH=100• Kc=cost of capacitor= cost of capacitor per KVAr * capacitor KVAr

Kc=0 .55*4000 + 0.59*10000 =8100$Zc= annual capacitor running cost ==0.22*Kc=1782 $/ year

• ∆Z= annual saving =Z∆p-Zc=9120 - 1782==7338 Which is > 0 good design • S.P.B.P =Kc/∆Z =8100/7338=1.1 year which is feasible

Economical for Mojeer al deen from QuseenMax case


1.2 Simulation For Mojeer Al deen Network Fed from Sara



MW Mvar MVA % PF

Swing

Bus(es):

8.200

2.3988.544 95.98Lag

Apparent

Losses:

0.110 0.398

∆P% 1.34


MW Mvar MVA % PF

Swing

Bus(es):8.3 2.49 8.211

95.94

Lag

Apparent

Losses:0.18 0.4

∆P% 2.1


V% Mojeer Al deen Network from Sara(max)


PF for Mojeer al deen from SaraMax case


• 1.2.2 FOR MINIMUM CASE

M. load case results without improvement

MW Mvar MVA % PF

Swing

Bus(es):

3.227 0.857 3.33896.66 lag

Apparent

Losses:0.018 .061

∆P% 0.558


MW Mvar MVA % PF

Swing

Bus(es):3.163 0.839 3.272 96.67Lag

Apparent

Losses:0.016 0.059

∆P% .506


1.3 Simulation For Aljam3a and Kamal jomblat Network fed from Quseen



MW Mvar MVA % PF

Swing

Bus(es):5.38 2.38 6.397 92.82La

g

Apparen

t Losses:

0.290 0.478

∆P% 5.4


MW Mvar MVA % PF

Swing

Bus(es):

5.747 3.082 6.521 88.12Lag

Apparent

Losses:0.333 0.528

∆P% 5.8


V% V% Aljam3a and Kamal jomblat Network in Quseen (max)

1.05 Vnominal <V<1.1 Vnominal


P.F Aljam3a and Kamal jomblat NetworkFrom quseen


• ∆∆P=saving in real power losses ==∆Pbefore-∆Pafter=0.043

Z∆p= annual saving in real power cost T=the time of max loss $/MWH=100 ==∆∆p*T*100=

• Kc=cost of capacitor= cost of capacitor per KVAr * capacitor KVAr Kc= 0 .135*4000 + 0.55*10000= =6040$ Zc= annual capacitor running cost ==0.22*Kc= 1329 $/ year

• ∆Z= annual saving =16340 - 1329==15011 Which is > 0 good design • S.P.B.P =Kc/∆Z = = 4.8 months which is feasible

Economical for Aljam3a and Kamal jomblat from QuseenMax case



Min. load case results without improvement

MW Mvar MVA % PF

Swing

Bus(es):2.902 1.476 3.255 89.14 lag

Apparent

Losses:0.089 .098

∆P% 3%


MW Mvar MVA % PF

Swing

Bus(es):2.593 0.955 2.763

93.83Lag

Apparent

Losses:0.057 0.091

∆P% .2.1%

Chapter(1) :Electrical Network Improvements

1.4 Simulation For Aljam3a and Kamal jomblat Network FED from Sara case



MW Mvar MVA % PF

Swing

Bus(es):6.063 1.042 6.447

98.69

Lag

Apparent

Losses:0.296 0.488

∆P% 4.6


MW Mvar MVA % PF

Swing

Bus(es):

6.2451.776 6.493

96.19

Lag

Apparen

t Losses:0.330 0.524

∆P% 5.2


V% V% Aljam3a and Kamal jomblat Network in Sara (max)


P.F Aljam3a and Kamal jomblat NetworkFrom Sara



MIN. load case results without improvement

MW Mvar MVA % PF

Swing

Bus(es):

2.90.87 3

96.19

Lag

Apparent

Losses:0.055 0.087

∆P% 1.89


MW Mvar MVA % PF

Swing

Bus(es):2.504 0.595 2.574 97.29

Lag

Apparen

t Losses:0.047 0.075

∆P% 1.87

For mojeer al deen

Quseennetwork

Saranetwork


MW Mvar MVA % PF

Swing

Bus(es):

7.597

2.6168.03 94.55Lag

Apparent

Losses:

0.110 0.398

∆P%

1.34


MW Mvar MVA % PF

Swing

Bus(es):

8.200

2.3988.544 95.98Lag

Apparent

Losses:

0.098 0.231

∆P%

1.29

For Aljam3a and Kamal jomblatQuseennetwork

Sara network


MW Mvar MVA % PF

Swing

Bus(es):5.38 2.38 6.397 92.82La

g

Apparen

t Losses:0.296 0.488

∆P%

5.4


MW Mvar MVA % PF

Swing

Bus(es):6.063 1.042 6.447

98.69

Lag

Apparent

Losses:

0.290 0.478

∆P%

4.6

Comparison between the Quseen

and Sara networks

Quseen network

Sara network

-Its fed from Quseen connection point

-It has low P.F& higher Losses

- Its fed from Sara connection

- Its has a high p.f due to transfer loads from Quseen to Sara connection point

- So the p.f increase and lower losses than the Quseen network

Optimization of the electrical network

2.1 Replacing transformers

The table below shows the values

of apparent power

and the load factor before and after the replacing:

Summary

Apparent Losses for mojeer al deen

2.2 : Operation mode of medium voltage distribution feeders:

Medium voltages (MV) are radialy..

We construct ring network to insure back-up connections to improve the reliability of the system. .

In MOJEER ALDEEN network we should construct rings for all four main feeders (on 6.6kv) after the switch gear ,between every two adjacent feeders

The main transmission line is ACSR ( cross sectional area120) Carries an electric current up to 395A.

Optimization electrical network

• But at worst condition they carry currents as the following



• Ring between ALENJELE and ALITHAD feeder:

• Ring between ALM3AJEN and ALDARDOK feeder:

Ring between ALMAHKAMA and ALENJELE feeder

Summary


Suggestion for Location of substation

2.3 Design substation


The main purpose of substation mainly feds hospitals and north region (Aseera Al Shmalia) and it is near the loads and it decreases losses so the current reach the customer in good quality also to improve ring system

• This figure shows the configuration of substation


• Electrical Network Supply• Nablus are fed from 4 connection point by Israel Electrical Company (IEC),

At 33KV as following:

Future planning for connection point

Nablus

1.Asker

(odeleh & Almeslekh)

30MVA 2.Sa

ra 40MV

A

3 .Innab 7MVA

4 .Howwara 20

MVA

Sara

Carraco

n

Transformer(33-11KV) 10MVA


Al jam3a

Mojeer Al

deen


Transformer(33-11KV)

10MVA

Transformer(33-11KV)

5MVA

Element of sara connection point

• Transmission Line • There are two type of conductor:1.ACSR 150mm22.XLPE cables 240mm2 • The resistance and reactance of XLPE and ACSR in table below

(A) Transmission Line DataMV Cable XLPEResistance (Ω/Km) 0.0975 Reactance (Ω/Km) 0.11486Length (Km) 3.7 Length (Km) 3.7Resistance (Ω) 0.36075 Reactance (Ω) 0.424982

MV overhead line ACSRResistance (Ω/Km) 0.223 Reactance (Ω/Km) 0.257Length (Km) 4.7 Length (Km) 4.7Resistance (Ω) 1.0481 Reactance (Ω) 1.2079


4.1 Strategic planning for the network

.Power (W)consumption in last ten year


Load Flow Results

• we can summarize the forecasted results, total generation, demand , loading., percentage of losses, and the total power factor for the maximum case in future ten years in Nablus network as in tables below:


4.2 Recommended and solution

Protection Analysis

Why protection system is needed• Personnel saifty against electrical hazards .• Avoid equipment stress(thermal,electrical,mechanical damages) .• make network stability .• Clear electrical faults and maintain service continuity

• Short cct calculation :

In our project we use Etap program to calculate the maximum currents for three regions East , MEDIUM and WEST loads .and we get the required short cct current from NEDCO

Protection Analysis

• Selection of circuit breaker :

• I C.B ≥ K safty*Imax load K safty=1.3• V C.B ≥ Vsystem• I breaking capacity ≥ 1.2 Is.c

• Selection of instrument transformer :• Potential transformer : Vs= 110v but V p≥ V source

• Current transformer : Is=5 A but I p≥ 1.1Imaxload

Protection Analysis and Design

• To make differential protection for the power transformer as the following figure:


• The relay which we used is (inverse time relay )• The aim of the protection in our project is how to achive selectivity

between cct breakers

• The following eqn is to calculate the setting (T)time of each relay

T=t0/K• T: setting time • t0 :operating time • K: factor depend on the type of the relay curves


t0 :operating time

Thank

• We thanks Dr.maher khammash

• We thanks NEDECO for cooperation with us especially for :

Eng. Shadia QamheyeEng.Allam Abd AlfattahEng.Samah Alnamer

strategic planning for nablus power system

Documents

load case results

electrical losses

maximum case

lagapparent losses

pfswing buses

minimum case

mojeer al deen network

kamal jomblat network