Load Flow and Security Analysis of Power System in Tiga Nusa.

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Giriantari, I. A D

Universitas Udayana, Department of Electrical Engineering, Bali, Indonesia

Author ID: 6507145301

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Load Flow and Suplly Security Analysis of Power

System in Tiga Nusa;

Before and After the Application of 20kV Submarine Cable

IW. Sukerayasa, IAD. Giriantari, YMA. Prawira

Department of Electrical Engineering

Udayana University, Bali, Indonesia

sukerayasawayan@yahoo.com, dayu.giriantari@unud.ac.id

Abstract— Tiga Nusa is a region consist of three small islands: Nusa Penida, Nusa Lembongan, and Nusa Ceningan, that located southeast of Bali Island. Those three small islands have many magnificent diving sports that are famous among divers all over the world. Therefore, this region becomes one of tourist attraction initiate rapid development. Energy demand in this region is increasing significantly. The power supply of this region is isolated from Bali Island. The utility company is trying to get supply from Bali Island by connecting this region through 20kV submarine cable. This paper presents the load flow analysis and supply security analysis of the Tiga Nusa system before and after the submarine cables operated.

Load flow analysis has found that power loss increase when submarine cable operates. Voltage drop is not significantly improved but it moved from Nusa Lembongan to Nusa Penida. However the supply security is until year 2033 if 2 submarine cables operate.

Keywords—Tiga Nusa; energy demand; submarine cable; power loss; supply security

I. INTRODUCTION

Tiga Nusa region has total area 20,284 km2consist of three small island; Nusa Penida, Nusa Lembongan, and Nusa Ceningan[1]. The distribution power system of this region was isolated to Bali island This region was supplied by diesel generators, PV Solar System, and wind generation. The availability capacity of power generation was 4,866 kW and it peak demand was 2,492 kW[2]. The three islands are famous of their magnificent diving sports which initiate rapid development in this region. Energy demand in this region is increasing significantly due to the rapid development of tourist facilities.

In order to provide enough supply with low cost, the utility company is trying to get supply from Bali Island by connecting this region to Bali Island through 20kV Submarine cable. There are 2 lines of XLPE 240mm2 submarine cables laid connecting two points: GH Pering in Bali Island and GH Jungut Batu at Nusa Lembongan. The application of

submarine makes some changes to the load flow of the power system. This study discusses the load flow and supply security before and after the application of submarine cable. This paper also shows the difference of the application of 1 and 2 submarine cables.

Software is utilized for this study. Firstly, single line diagram of the system is drawn as seen on Fig. 1, then the load flow is calsulated.

II. RESULT AND DISCUSSION

A. Load Flow Analysis

Software is utilized for load flow analysis in order to find the power loss and voltage drop due to new supply from submarine cables. The capacity of each submarine cable is 13MW. The result of the power loss before submarine cables were applied is shown in Fig.1. It found that network losses is 0.046 MW and the total generation is 1,785 MW, therefore the power loss is 2.57%.

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Fig. 1 Software report before application of submarine cable

Software report of the Tiga Nusa system for the application of 2 submarine cables is shown in Fig.2. It shows that the network losses is 0.068 MW and the total generation is 1,807 MW therefore the power loss is 3.76%.

Fig. 2. Software report after application of 2 submarine cables

The software report the system if only 1 submarine cable is applied is shown in Fig.3. It shows that the network losses is 0.093 MW and total generation in 1,832 MW therefore the power loss is 5.07%.

Fig. 3. Software report if only 1 submarine cable is applied

Hence, we can see that power loss is increasing when there is more supply from the submarine cables. The largest power loss found if supply delivered by only1 submarine cable. Fig.4. shows the different power loss of existing, when supply comes from 2 submarine cables and when only 1 submarine cable.

2.57

3.76

5.07

0 1 2 3 4 5 6

Existing 2 Submarine Cables 1 Submarine Cable

Power loss (%)

Fig. 4. The power loss of 3 different supply

This study also found the voltage drop which initially exhibited in Nusa Lembongan and Nusa Ceningan are decreased when supply come from the submarine cables due to the largest supply moved forward. In contrary, voltage drop in Nusa Penida is increased because the largest supply moved to other Island. Table I shows the voltage drop and its location for existing system and when supply come from submarine cables.

TABLE I. VOLTAGE DROP AND ITS LOCATION

LOCATION

VOLTAGE RATING

VOLTAGE BUS

VOLTAGE DROP

Nusa Penida (NP0042) 20 kV 19.427 2.86%

Nusa Penida (NP0066) 20 kV 19.425 2.87%

N.Lembongan (JB0016) 20 kV 19.108 4.46%

N Lembongan (JB0003) 20 kV 19.089 4.55%

Nusa Penida (NP0042) 20 kV 19.326 3.37%

Nusa Penida (NP0066) 20 kV 19.324 3.38%

N.Lembongan (JB0016) 20 kV 19.723 1.39%

N.Lembongan (JB0003) 20 kV 19.768 2.47%

Nusa Penida (NP0042) 20 kV 19.059 4.71%

Nusa Penida (NP0066) 20 kV 19.057 4.72%

N.Lembongan (JB0016) 20 kV 19.462 2.69%

N.Lembongan (JB0003) 20 kV 19.507 2.47% EXISTING

2 SUBMARINE CABLES

1 SUBMARINE CABLE

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-Existing 2 Submarine Cables 1 Submarine Cable

k

W

h

Energy loss

Fig. 5. Graph of energy loss

B. Supply Security

Supply security analysis is done in order to know the ability to supply of the Tiga Nusa power system due to the increasing demand by the year. The supply system consider secure if it submarine cables operate in 2014.

Existing condition, where the largest supply is from diesel generator in Nusa Penida with its power is 1.480 MW. It is obviously not secure when this generation is off. It is shown in Table II.

TABLE II. SUPPLY SECURITY OF SCENARIO 1

YEAR operated. It is found that large supply from Bali Island result in large reserve power. The largest supply is from submarine cable which has power 13 MW each. When one of this cable is off there will be still enough supply to the system. Therefore the supply system is secure until the year 2033. Table III shows the detail of the scenario 2.

TABLE III. SUPPLY SECURITY FOR SCENARIO 2

YEAR

The supply security of the Tiga Nusa system for scenario 3 which only 1 submarine cable is operated shows that will secure until end of the year 2014. The largest supply is come from the submarine cable, therefore when the only one subamarine cable is off the system is supplied only from the diesel genartor in Nusa Penida. Table IV shows the security of the supply yearly.

It is shown that there have to be 2 line submarine cables in order to secure the supply to Tiga Nusa region. If there is a problem in 1 line submarine cable, the system still get supply from other line. The system will become more fragile if there is only1 line supply to the region.

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TABLE IV. SUPPLY SECURITY OF SCENARIO 3

YEAR

PEAK LOAD (MW)

N-1 CONDITION

(MW)

RESERVE POWER

(MW) NOTE

1 2 (3)=(2)-(1)

2013 2.73 4.22 1.49 Secure

2014 3.00 4.22 1.22 Secure

2015 3.29 1.72 -1.57 Not secure

2016 3.61 1.72 -1.89 Not secure

2017 3.96 1.72 -2.24 Not secure

2018 4.33 1.72 -2.61 Not secure

2019 4.73 1.72 -3.01 Not secure

2020 5.16 1.72 -3.44 Not secure

2021 5.61 1.72 -3.89 Not secure

2022 6.09 1.72 -4.37 Not secure

2023 6.60 1.72 -4.88 Not secure

2024 7.13 1.72 -5.41 Not secure

2025 7.69 1.72 -5.97 Not secure

2026 8.27 1.72 -6.55 Not secure

2027 8.89 1.72 -7.17 Not secure

2028 9.52 1.72 -7.80 Not secure

2029 10.19 1.72 -8.47 Not secure

2030 10.88 1.72 -9.16 Not secure

2031 11.59 1.72 -9.87 Not secure

2032 12.34 1.72 -10.62 Not secure

2033 13.11 1.72 -11.39 Not secure

III. CONCLUSION

The utilization of submarine cables to deliver power to the Tiga Nusa region has caused a significant power loss and energy loss to the system in the region. The supply security to the region is much better until the year 2033 if 2 submarine cables are utilized. In contrary, the supply security is drop in the year 2014 if 1 submarines cable is utilized.

REFERENCES

[1] http://www.klungkungkab.go.id/index.php/profil/15/ Kondisi-Geografis, accessed on 19 Maret 2013

[2] PT. PLN (Persero) Area Bali Timur

,

Peak load Bali Timur Feeder 2005-2012(Beban Puncak Penyulang Bali Timur 2005 s.d. 2012). Klungkung:

[3] Daniel Rohi, dkk. Vol II, No.1 Juni 2008, Journal EECCIS. Application of Load Flow for Energy Loss Estimation in 20kV Radial Distribution system (Aplikasi Pendekatan Aliran Daya untuk Estimasi Rugi Rugi Energi Sistem Distribusi Radial 20 kV).

[4] Momoh, James A. Electric Power

Distribution,Automation, Protection, and Control. Taylor and Francis Group, CRC Press. 2007: 44-45

[5] Fujikura Shanghai Cable LTD, The development of 20kV submarine cable interconnection system Bali-Nusa Lembongan (Pembangunan Sistem Interkoneksi Kabel

Laut 20 KV Bali–Nusa Lembongan)