Overview of India Preparations for. Interconnections with Bangladesh & Sri

Transcription

1 Overview of India Preparations for Interconnections with Bangladesh & Sri Lanka Overview of India Preparations for Interconnections with Bangladesh & Sri Lanka

2 Outline. India Bangladesh Interconnector Context/Background Scope of work Major Milestones Salient Features of HVDC system

3 1x500 MW HVDC BTB India-Bangladesh Interconnecter Project KAHALG AO N M ADHOPUR INTERCONNECTIO N BETW EEN INDIA AND BANGLADESH G RIDS M ALDA JAYPURHAT KHEJURIA BARAPUKURIA FARRAKA NAO G AO N BO G RA DHULIAN CH. NAW ABG ANJ NIAM ATPUR BANGLADESH BO G RA SO UTH SAG ARDIG HI DURGAPUR G O KARNA RAG HUNATHGANJ RAJSHAHI INDIA BAHARAM PUR BAHARAM PUR (400 KV) 400kV D/c NATO RE BHERAM ARA ISHURDI SIRAJG ANJ SHAHJAD PUR PABNA BAG HABARI G HORASAL KATW A BAKRESHW AR KO LAG HAT SUBHASG RAM JEER AT KHULNA (SO UTH) BO TTAIL FARIDPUR LEG END THE PROJECT 400 kv 230 kv 132 kv Existing Under Constr. / Future

4 Context/Background: The interconnection of Electrical Grids between the India and Bangladesh was discussed during the visit of Indian delegation to Bangladesh from 22nd Nov. to 26th Nov., Various options for the interconnection were explored and keeping in view The Technical & Operational Aspects Economical considerations

5 Scope of Work for the interconnector project Indian Portion Transmission Line Baharampur(India) Bheramara(Bangladesh) 400kV Double Circuit line (Indian Portion) : App 85 Kms (Twin ACSR Moose Conductor) Loop-in and loop-out of Farakka-Jeerat 400kV Single Circuit line at Baharampur(India) : 3 Kms

6 Scope of Work for the interconnector project Indian Portion Sub-station Establishment of 400kV switching-station at Baharampur(India) 2 Nos of 400 kv line bays for loop-in and loop-out of Farakka-Jeerat 400kV Single circuit line 1 No. of 80 MVAR Bus Reactor Space provision for at least 2 no. of 400kV bays

7 Scope of Work for the interconnector project Bangladesh Portion Transmission Line Baharampur(India) Bheramara(Bangladesh) 400kV Double Circuit line (Bangladesh Portion) : App 27 Kms (Twin ACSR FINCH Conductor) Loop-in and loop-out of Ishurdi - Khulna South 230kV Double Circuit line at Bheramara(Bangladesh) : App 5 Kms

8 Scope of Work for the interconnector project Bangladesh Portion Sub-station Establishment of 500 MW HVDC back-to-back station and 230kV switching-station at Bheramara(Bangladesh) Installation of 500 MW HVDC back-to-back terminal. 4 nos of 230 kv line bays for LILO of Ishurdi -Khulna South 230kV Double Circuit line Space provision for at least 2 no. of 230kV bays

9 Scope of Consultancy Contract Pre Award Engineering Finalization of Bidding Documents, Assistance in Tender evaluation Post Award Engineering Training of PGCB Engineers for 4 weeks Construction Supervision

10 Details of Various Packages under the India Bangladesh Interconnector Project The Details of various Packages related to the project is given below: Sl No Package Details Date of Award/ Name of Party Awarded Cost 1 1x500 MW HVDC BTB Station (Bangladesh portion) Contract awarded on - 31st Mar 2011 M/s Siemens AG, Germany *INR Crores (Euro 76,622,438 BDT 1,569,772,103) 2 400kV Transmission line (Bangladesh portion Contract Agreement on - 30th December 2010 M/s Cobra,Spain *INR Crores (USD ; BDT ) KV Transmission line (Indian Portion) Letter of Award issued on 5th January 2011 M/s A2Z Ltd INR Crores 4 Behrampur S/s (India Portion) Letter of Award issued on - 21st December 2010 M/s KEC International Limited, Gurgaon, India INR Crores ( Supply INR ; Services INR ) Note: Consultancy Assignment for No. 1 & 2.

11 Major Milestones in Consultancy Assignment A) HVDC Project Sr. No Description Date 1. NIT (Two Stage Bidding) 28th Feb'10 2. OBD (Stage -1 Bid) (Re scheduled) 20th May'10 3. Clarification meeting with the bidders & finalization of draft amendment at PGCB Dhaka 2nd- 12th Aug'10 4. Submission of draft amendment to PGCB at Dhaka 12th Aug '10 5. Submission of price bid (OBD Stage -2 bid) by bidders 08th Nov '10 6. Post Bid Discussions & preparation of award documents 09th - 13th Feb' Notification of Award 14th Feb 2011 Contract Award 31st March 2011

12 Major Milestones in Consultancy Assignment B) Transmission Line Package (Bangladesh Portion) Sr. No Description Date 1. NIT (Single Stage Bidding) 28th Feb'10 2. Pre Bid Conference 29th Mar OBD (Stage -1 Bid) 26th April' Discussion on Bid Evaluation with PGCB at Dhaka and submission of draft clarifications to PGCB 4th- 7th July'10 5. Receipt of Clarification from Bidders 22nd Aug Submission of Evaluation report by POWERGRID on the basis of Clarification received from the bidders 7. Notification of Award 15th Sep'10 04th Nov '10 8. Contract Award 30th Dec 10

13 HVDC SALIENT FEATURES: HVDC SALIENT FEATURES: The following transmission data are defined on the DC side at the rectifier: A DC Power Nominal (without redundant cooling) : MW at rectifier Maximum continuous (with red. Cooling, 1.05 pu) : MW at rectifier Minimum : 50.6 MW (10% of rated Power) B DC Voltage Rated : kv Maximum : kv (1.03 pu) Minimum : kv (at Overload) C DC Current Nominal (without redundant cooling) : ka Maximum continuous (with red. Cooling) : 3.76 ka Minimum (nominal) : 320 A (for 10% min. Load)

14 HVDC Salient Features:

15 Converter Transformer Details:

16 Thyristor Valve Data

17 Valve Hall Configuration Valve Hall Configuration Smoothing Reactor Air core reactor located outside the valve hall. Two unit of 30 mh to be installed for 500 MW block. - Nominal inductance (1 unit) 30 mh - Current 3200 Amps - Maximum continuous current 3762 Amps

18 Reactive Power Details of the Project:

19 Filter Configuration 400kV Side:

20 Filter Configuration 230 kv Side:

21 Interconnection of India-Sri Lanka Electricity Grids

22 Interconnection of India-Sri Lanka Electricity Grids Introduction Context/Background Scope of work Major Milestones Salient Features of HVDC system

23 Introduction MoU Signed between GoI & GoSL on 9th June, 2010 for carrying out feasibility study for interconnection of India-Sri Lanka Electricity Grids Executing Agency : POWERGRID (India) & CEB (Sri Lanka) The HVDC link would consist of overhead line in the territories of India and Sri Lanka and submarine cable for the sea portion between the end point of overhead portion of Indian and Sri Lankan side.

24 India Sri Lanka Interconnection HVDC Line Length in Indian territory: 130KM(Approx.) Submarine Cable Length between India and Sri Lanka:120KM HVDC Line Length in Sri Lankan territory: 110KM(Approx.)

25 India Sri Lanka Interconnection

26 Proposed Route for Interconnection Madurai Panaikulam Thirukketiswaram New Anuradhapura

27 Scope of Work 1000MW HVDC System from India(Madurai) to Sri Lanka(New Anuradhapura): 360km Indian Territory (Scope : POWERGRID ) Madurai to Panaikulam : 130km Establishment of new 400kV S/s at Madurai Madurai(New) Madurai 400kV D/c line (50 km) Madurai(India) to Indian Sea Coast(Panaikulam) HVDC overhead line : (130km) HVDC Terminal (4x250MW in two stages or 2x500MW in two stage or 2x500MW Single Stage) at Madurai(India)

28 Scope of Work Sea Route (Scope : POWERGRID) Panaikulam(India) to Thirukketiswaram(SL) : 120km India Sea Coast(Panaikulam) to Sri Lankan Sea coast (Thirukketiswaram) HVDC line (Submarine Cable) (120 km) Sri Lankan Territory (Scope : CEB) Thirukketiswaram) to New Anuradhapura : 110km Sri Lankan Sea Coast(Thirukketiswaram) to New Anuradhapura(Sri Lanka) HVDC overhead line in Sri Lankan Territory (110km) HVDC Terminal (4x250MW in two stages or 2x500MW in two stage or 2x500MW Single Stage) at New Anuradhapura (Sri Lanka)

29 Scope of Work: Feasibility Study The feasibility study report for land route in Indian Territory and complete sea route is under the scope of POWERGRID while feasibility study report for land route in Sri Lankan territory is under the scope of CEB. The estimated cost of the feasibility study is US$ 3.0 Million, to be shared by Govt. of India and Govt. of Sri Lanka in equal proportion. Out of this the share of POWERGRID and CEB are US$2.375 Million and US$0.625 Million respectively for the tasks assigned to them.

30 Scope of Work: Feasibility Study POWERGRID s portion of the major scope of feasibility study completed. Minor modification required due to increase in undersea cable length as intimated by CEB recently. CEB portion of the feasibility study is under preparation. CEB has awarded the above work to POWERGRID Task Force and Steering Committee Meeting- 3 rd and 4 th of August, 2011 at New Delhi. Final Submission of the feasibility study report- Completion by Dec., 2011

31 Project Summary Details of HVDC Interconnection : All the following options would be studied in the DPR HVDC Terminal Capacity Option-I : 4x250MW terminal in two stages Option-II : 2x500MW terminal in two stages Option-III : 2x500MW terminal in single stage HVDC Technology Conventional and VSC VSC technology can be operated under black start With VSC technology, there will be increase in the cost of the entire system

32 Project Summary Option I (With Conventional Thyristor based System): ± 400kV, 4x250MW in two stages Stage I: ± 400kV, 2x250MW Stage II: ±400kV, 2x250MW Option I (With Voltage Source Converter based System): ±320kV, 4x250MW in two stages Stage I: ± 320kV, 2x250MW Stage II: ± 320kV, 2x250MW

33 Project Summary Option II (With Conventional Thyristor based System): ±400kV, 2x500MW in two stages Stage I: ±400kV, 1x500MW Stage II: ±400kV, 1x500MW Option II (With Voltage Source Converter based System): ±320kV, 2x500MW in two stages Stage I: ±320kV, 1x500MW Stage II: ±320kV, 1x500MW

34 Project Summary Option III (With Conventional Thyristor based System): ±400kV, 2x500MW in single stage Option III (With Voltage Source Converter based System): ±320kV, 2x500MW in single stage ± 400kV Conventional Thyristor based System is using Mass Impregnated Cable and ±320kV Voltage Source Converter uses extruded cable.

35 Basic HVDC Single Line Diagram

36 Configurations: Bipolar System

37 Configurations: Monopolar Ground Return

38 Monopole with metallic return conductor One pole one conductor for transmission and the return current is through metallic return.

39 HVDC Technology: Thyristor based VS IGBT based Description Classic VSC Converter Valves SCR IGBT Connection Valve-AC Grid Filtering Converter Transformer 50% in filters and shunt Capacitor Transformer+Reactor Less Filter required. Dc Current Smoothing Smoothing Reactor DC Capacitor

40 HVDC Technology: Thyristor based VS IGBT based Thyristor based Conventional HVDC System Uses conventional Thyristors (SCRs) Needs ac voltage source for commutation. Can not Supply reactive power to the ac system. Based on conventional thyristors it utilizes ac system voltage for commutation of current from one valve to another. This converter can convert and control active power in either direction, but in doing so consumes reactive power.

41 HVDC Technology: Thyristor based VS IGBT based IGBT based HVDC System Lesser space and height requirements. Active and Reactive power: Independent Control No Commutation failure: Commutation is the process in which SCR is turned off when current is zero. Black Start Capability: The ability to start-up a collapsed network. In such case it acts as a virtual generator. Shorter time for installation and commissioning In VSC, the roles of rectifier and inverter can be interchanged between the stations any time without delay, without breaker switching and without polarity reversal.

42 HVDC Technology: Thyristor based VS IGBT based LCC VSC Mature Technology-Since 1954 Emerging Technology-Since 1997 Large Site area, dominated by harmonic filters Compact site area almost half of LCC Site area High Power capability up to 7200MW at ±800kV Weak reactive power control Generates harmonic distortion, AC and DC Filters required. Low Station Losses (Approx. 0.8%) Needs converter transformer built by specialist facilities Power is reversed by reversal of dc voltage polarity Current- Sourced Line-commutated No Black Start Capability Limited Power Capability with 1000MW at ±320kV Good reactive power control No Harmonic generation no filters required High Station losses (Approx.1.1%) Conventional Transformer Power reversal by reversal of dc current polarity Voltage-Sourced Self-Commutated Black Start Capability

43 Sea between India and Sri Lanka

44 Sea profile in General The general sea profile between India and Sri Lanka Sea Coast is of shallow nature except at certain places. The topography in general is smooth except at Rameshwaram end. Generally, the sediments are olive grey colored fine clays at top of the core and coarse sand at the bottom with fragments of shells throughout the cores. The data suggest several trawl drag marks suggesting heavy fishing activity both in Indian and Sri Lankan territory.

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