Harmonic Analysis

KOREA NATIONAL OIL CORPORATION VIETNAM OFFICE

RONG DOI GAS FIELD DEVELOPMENT PROJECT

HARMONIC PENETRATION ANALYSIS As per MOM KNOC UL-0004 DEV/S dated 27th April 05, it is concluded that detailed harmonic analysis calculation is not necessary for Electrical Power System of Rong Doi Gas Field Development Project. Accordingly this document is issued without change and shall be treated as final.

DISCIPLINE

ARCH

CONST

ELECT

INSTR

MAT’RL

MECH

PIPING

PIPELINE

PROCESS

SAFETY

STRUC

SIGN/DATE

-

-

-

-

-

-

-

-

-

-

-

D1

28-APR-05

APPROVED FOR CONSTRUCTION

YSN

JUB/MSH

BSK

C1

28-APR-05

APPROVED FOR DESIGN

YSN

JUB/MSH

BSK

B1

28-JAN-05

ISSUED FOR APPROVAL

HFS

BK

KCG

TM

A1

26-JAN-05

ISSUED FOR DIC / IDR

HFS

BK

-

-

-

Rev.

Date

Description

By

Checked

Approved

QA

Client

This document is the property of KECS – any unauthorized use of the same will be prosecuted. Total or partial reproduction and/or utilization of this document are forbidden without prior written authorization of the Owner Korea National Oil Corporation Vietnam Office

Category

Code Description

Facility

200

Common

Phase

30

Detailed Engineering

Discipline

E

Electrical Engineering

Type

CA

Calculation

Project Number

Facility

Phase

Discipline

Type

Sequence Number

Revision Code

VN01

200

30

E

CA

8007

D1

RONG DOI GAS FIELD DEVELOPMENT PROJECT HARMONIC PENETRATION ANALYSIS

TABLE OF CONTENTS SECTION

DESCRIPTION

PAGE

1.0

INTRODUCTION

1

2.0

OBJECTIVE

2

3.0

ACCEPTABLE HARMONIC DISTORTION LIMITS

2

4.0

STUDIES

3

4.1 4.2

3 3

CURRENT TOTAL HARMONIC DISTORTION (THDI) VOLTAGE TOTAL HARMONIC DISTORTION (THDU)

5.0

SYSTEM PARAMETERS

4

6.0

HARMONIC PARAMETERS

4

6.1 6.2 6.3 6.4

5 6 6 7

7.0

VSD FOR STARTING MOTOR UPS AND DC CHARGERS THYRISTER HEATER LIGHTING

SYSTEM CONSIDERATION

9

7.1 7.2

9 9

OPERATING CONDITIONS ASSUMPTION

8.0

METHODOLOGY

10

9.0

CALCULATION

10

10.0

RESULTS

10

11.0

RESULT ANALYSIS

11

© Kvaerner E&C Singapore Pte Ltd VN01-200-30-E-CA-8007

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SECTION

DESCRIPTION

PAGE

12.0

RECOMMENDATION

12

13.0

REFERENCES

12

APPENDICES APPENDIX A

HARMONIC ANALYSIS REPORT CASE - I

APPENDIX B

HARMONIC ANALYSIS REPORT CASE - II

© Kvaerner E&C Singapore Pte Ltd VN01-200-30-E-CA-8007

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INTRODUCTION The Kvaerner Engineering and Construction Singapore Pte Ltd (KECS) has been engaged by a HHI who have been awarded EPIC contract for the project to undertake certain design and engineering activities for a Rong Doi Gas Development Project operated by KNOC. The Rong Doi and Rong Doi Tay Fields are located in Block 11-2 in the Nam Con Son Basin offshore Vietnam. The Rong Doi and Rong Doi Tay Fields (RD and RDT) are located approximately 320km to the south-east of Vung Tau and were discovered in 1995 and 1996 respectively by KNOC, working as the Operator on behalf of a consortium of seven Korean companies. The Rong Doi Tay Field is located approximately 2.5km to the west of Rong Doi. The current development schedule will achieve a First Gas Date of 30 September 2006. The field and facilities are designed to deliver an average of 130MMscfd of sales gas but will have the capacity to produce up to 175MMscfd of sales gas for short periods. The objective of the Rong Doi and Rong Doi Tay development is to design, install, produce and deliver pipeline specification gas to the gas purchaser PetroVietnam, as per the terms of the Gas Sales and Purchase Agreement (GSPA). The facilities shall consist of a Wellhead Platform bridge connected (80m) to a Production Utilities Quarters Compression Platform (PUQC). An FSO will be installed to receive stabilized condensate stripped from the gas via a 2.5 Km long 6" line. The gas will be transported by a 58 Km 18” pipeline to a Wye in Namcon Son gas trunk line operated by BP. Drilling activities will be performed by a jack-up rig with all weather capability.

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OBJECTIVE Harmonic analysis has been carried out to study the performance of the electrical system with harmonic loads. The purpose of harmonic analysis is to arrive at the total harmonic distortion at various locations due to harmonic producing loads in the network and to determine the corrective measures required to reduce the harmonic distortion to acceptable levels. Normally harmonic analysis is conducted when harmonic producing loads exceed 10% of total load. In Rong Doi Gas Field Development Project, the harmonic producing loads such as UPS, rectifiers, variable speed drives, thyrister control heaters and lighting constitutes more than 10% of total running loads. This has necessitated to conduct detail harmonic analysis for the complete Generation and Distribution System for Rong Doi Project. This study considered the impact of the harmonic producing equipment installed on Wellhead Platform (WHd) and Production Utilities Quarters Compression Platform (PUQC).

3.0

ACCEPTABLE HARMONIC DISTORTION LIMITS The total harmonic voltage distortion shall be limited to following values as indicated in Table 3.1 in compliance to IEC 61000. TABLE 3.1

LOAD DESCRIPTION

TOTAL HARMONIC DISTORTION (VOLTAGE) THDU

Sensitive Loads (UPS, Computer, PCS, Printers, Monitors)

5%

Industrial Loads (Motors, Heaters, Capacitor Lighting, Actuators)

8%

Note :

As per agreed design basis, the THD (V) shall be limited to 5% in Rong Doi Electrical Power Distribution System.

The total harmonic current distortion limits THD (I) is not well defined in IEC for power distribution system. The total current distortion limits are considered as per IEEE 519-1992. The individual harmonic current and total harmonic current distortion limits are defined in IEEE Std 519 Table 10.3 and the same is reproduced below for information. The current distortion limits for distribution system are © Kvaerner E&C Singapore Pte Ltd VN01-200-30-E-CA-8007

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indicated in Table 3.2 below. TABLE 3.2 - CURRENT DISTORTION LIMITS FOR GENERAL DISTRIBUTION SYSTEM (120V THROUGH 69,000V MAXIMUM HARMONIC CURRENT DISTORTION IN PERCENTAGE OF IL Individual Harmonic Order (Odd Harmonics) Isc/IL