EXPRESSION OF INTEREST

Transcription

1 र ष ट र य पवन ऊर स स थ न, च नन ई NATIONAL INSTITUTE OF WIND ENERGY म व प ( न ऊर जव प र द य ग क कप द र Formerly Centre for Wind Energy Technology ) (न न और न करण य ऊर जव त रजलय, भजरत सरकजर Ministry of New and Renewable Energy, Government of India) EXPRESSION OF INTEREST NIWE is inviting submission of Expression of Interest (EOI) from suitable and experienced equipment Suppliers for comprehensive Low Voltage Ride Through (LVRT) Testing & Measurement services for Wind Turbines. The details of the specification and other details can be found attached as ANNEXURE A & B. The EOI is proposed for acquisitions of new equipment as per the specifications mentioned and also on rental basis. Meeting at NIWE, Chennai with respect to the EOI will be convened with the interested parties within two weeks from the last date of submission of the inputs, if needed, to finalize the Tender terms and conditions. The Interested Bidders shall submit their EOI proposals for the supply of equipment by outright purchase basis (in a sealed cover ) super-scribing EOI from suitable and experienced Equipment suppliers for comprehensive Low Voltage Ride Through (LVRT) Testing & Measurement services for Wind Turbines, Due on 31/01/2018 at 5.30 P.M in the prescribed format to NIWE at the following address: The Deputy Director General (F&A) National Institute of Wind Energy (NIWE) (Formerly Centre for Wind Energy Technology) Velachery Tambaram Main Road, Pallikaranai, Chennai , Tamil Nadu Ph: , , , Mobile: directorfa.niwe@gov.in Any amendment to the EoI will be published only in the NIWE Website : It is the responsibility of participating organization to visit the NIWE website frequently to know about the latest updates / amendments / corrigendum / addendum / clarifications if any. DEPUTY DIRECTOR GENERAL (F&A)

2 Guidelines SPECIFICATIONS FOR LOW VOLATAGE RIDE THROUGH (LVRT) Annexure -A The CEA (Technical Standards for Connectivity to the Grid) 15 th October 2013 for wind and solar generating stations which stipulates that, the wind generating stations connected to the grid at 66 kv voltage level and above shall have the Low Voltage Ride Through (LVRT) capability. FigureA1: LVRT requirement Curve as per Central Electricity Authority (CEA), India During the fault ride through, wind turbine generators in wind farm shall have the capability to meet the following requirements. Shall minimize the reactive power drawal from the grid The wind turbine generator shall provide the active power in proportional to retained grid voltage as soon as the fault is cleared. This Indian Electricity Grid Code (IEGC) and CEA requires Low Voltage Ride-Through (LVRT) capability during voltage drops in Transmission System to 15% of nominal voltage during 300 ms with recovery up to 80% of nominal voltage after 3000ms, with the slope shown in figurea1. An inductive voltage divider is recommended by the international standard for measurement of power quality characteristics of wind turbines (IEC , Edition 2.0, ) which is to be connected ahead of the wind turbine to be tested. This voltage divider consists of a series impedance (coil) Z1 and a short-circuit impedance Z2. Page 1 of 14

3 Figure A2: LVRT test schematic at turbine side The figure A2 shows a simplified view of the test equipment. The impedances Z1 and Z2 consists of several coils each (series and parallel connection). By changing the ratio Z1 to Z2 the depth of the voltage dip can be configured. Test Description The local grid where the wind turbine is to be connected operates at nominal frequency equal to 50 Hz and nominal medium voltage level equal to 11kV,22kV and 33 kv. The test is basically for verifying wind turbine response to voltage drops (due to grid faults) and providing a basis for wind turbine numerical simulation model validation. The voltage dip tests to be carried out with voltage dip test equipment (LVRT-mobile Container). This test equipment is based on the classical voltage divider, consisting of a series impedance Z1 and a short circuit impedance Z2, as illustrated in Figure A3. Figure A3: Test setup diagram. The measurements to be carried out at low, medium and ground as shown in the figure A3. Page 2 of 14

4 Grid Characteristics at possible test location The LVRT testing of a wind turbine is dictated by the grid characteristics of the point of connection of the wind turbine. The stiffness and other parameters are taken into consideration while performing the LVRT testing so that the fault seen at the turbine terminals does not have a severe effect on the grid. General grid characteristics for testing in India: Voltage levels 11, 22 and 33kV Short circuit ratio 3 to 10 Short circuit MVA 100 to 175MVA Cases of Measurements As per IEGC The test should be performed with a voltage dip of minimum of 0.15 p.u and shall remain so for 0.3s. During this period, the turbine shall produce maximum reactive power. After 0.3s, the dip shall be taken away and then the turbine shall produce active power in proportion will the reactive power for the next 2.7s at which time the voltage level shall be raised to 0.85 p.u and be abated. This is shown in figure A4. Cases Special Case 1 - Symmetrical Three phase voltage drop Special Case 2 - Symmetrical Two phase voltage drop Figure A4: IEGC recommendations Magnitude of Voltage (phase to Phase) as a fraction before drop occurs Table A1: Test Cases to be performed for LVRT as per IEGC As per IEC Duration (ms) The response of the wind turbine to the voltage drops specified in Table A2 shall be stated for the wind turbine operating at a) between 0,1 Pn and 0,3 Pn and b) above Page 3 of 14

5 0,9 Pn. The stated response shall include results from 2 consecutive tests of each case (VD1-VD6) by time- series of active power, reactive power, active current, reactive current and voltage at the wind turbine terminals for the time shortly prior to the voltage drop and until the effect of the voltage drop has abated, but also the wind turbine operational mode shall be specified. Table A2 Specification of voltage drops. The specified magnitudes, duration and shape are for the voltage drop occurring when the wind turbine under test is not connected as per IEC Edition 2.0, Measuring Instruments The voltage transducers (transformers) and current transducers (transformers) are the required sensors of the measurement system. The signal conditioning is for connecting these to the low-pass filter that are required for anti-aliasing. The analogue to digital conversion (A/D) shall be of at least 12 bit resolution. Equipment Required accurac y Compliance with Voltage transformers Class IEC Current transformers Class IEC Filter + A/D converter + data acquisition 1 % of full scale IEC Table A3 Specification of requirements for measurement equipment The digital data acquisition system is assumed to log, calculate and store results as specified in the above test description. This requires a sample rate of at least 2 khz per channel of the voltage and current signals. The basis for the above shall be as per the recommendations of IEC Edition 2.0, High Voltage Equipment The switch gears/surge arrestors shall have to operate as per relevant standards, without causing external flashovers to equipment, other test equipment and earthed structures. Some list of equipment s and its relevant standards are mentioned in the below table A4. Page 4 of 14

6 Sl. Product Standard/ Specification 1 High-voltage alternating current circuit-breakers IS IEC Alternating current disconnectors and earthing switches IS 9921 Part 1, 2, 3, 4 & 5 IEC ) 3 Switches for rated voltages above 1 kv and less than 52 kv 4 High-voltage alternating current switch-fuse combinations 5 High-voltage alternating current switchgear-fuse combinations IS 9920 Part 1, 3 & 4 IEC IS IEC IEC Switchgear having combined functions IEC Automatic circuit reclosers IS AC insulation enclosed switchgear and control gear for rated voltages above 1 kv and up to and including 38 kv IS IEC High voltage fuses IS 9385 IEC IS 9402 IEC IS IEC Residual current operated circuit breaker for house hold and similar uses IS IEC IEC IEC Low Voltage Circuit breakers IS Part 2 IEC Low voltage fuses for voltages not exceeding 1000 Vac or 1500 Vdc IS IEC Miniature Fuses IEC Table A4. List of equipment s and its relevant standards Analysis Program/Software The codes supplied may include data acquisition, simulation, calculation and analysis as per relevant standards. Necessary training for capacity building may also be included. Page 5 of 14

7 SAFETY The equipment shall adhere to Indian Electricity Rules and any Regulatory requirements of the Central and State Government, for safety. The equipment layout shall provide adequate working space at each work center to enable unrestricted movement during working. The equipment supplier shall adequately take care of safety aspects on the following points and ensure compliance with suitable display, training, guidance etc. 1. The equipment are expected to comply with the safety requirements of electrical shocks 2. A danger notice board with a sign of skull and bones shall be displayed in Electrical testing area with voltages above 400 Volts. SP 30 charts where required shall be displayed. 3. Instructions for resuscitation of persons suffering from electrical shocks shall be prominently displayed. 4. Switchboard shall have clear space around as specified by statutory authority. 5. Due care shall be taken where the equipment is likely to have emissions in test which may endanger the operator/ equipment. 6. Fire buckets filled with clear and dry sand and water ready for immediate use for extinguishing fires in addition to fire extinguishers for dealing with electric fires shall be available. 7. Fire extinguishers of suitable type depending upon class of fire. 8. Availability of first aid kit. 9. Ensure minimum safe clearance in air between high voltage terminal and earth during testing at different voltage levels of AC/ DC/ Impulse applications. 10. Ensure proper earthing of equipment before making physical contact. 11. Use of safety interlocks. 12. Restrict entry with prominent display boards, of un-authorized persons during testing. 13. Where necessary, control desks shall have inter-locks and control shall be with the authorized persons only. Page 6 of 14

8 Annexure -B LVRT Equipment Requirement The wind turbine testing unit at NIWE is proposing to expand its testing facilities by introducing LVRT testing for wind turbines to ensure turbines installed comply with the guidelines of the Indian Electricity Grid code. This facility will help the manufactures in the country to conduct LVRT test which is mandated by the CEA. Technical Specification Mobile test container (not more than 45 feet, IP 64 class) Vaccum or Air circuit breakers Rated for 36kV voltage levels Lightning withstand voltage 170kV Power frequency withstand voltage 70kV Current values to be defined as per rating levels SF6 breakers to be included where required Rated for 36kV voltage levels Lightning withstand voltage 170kV Power frequency withstand voltage 70kV Current values to be defined as per rating levels Functionality up to 2000m altitude Minimum fault occurrence time 100ms T-connectors to be included Load banks as required IEC cables to be used Voltage level for equipment 11,22 and 33kV / 240V Page 7 of 14

9 Maximum power of turbine to be tested 3MW for 11kV,22kV & 33kV Measurement points at grid and test side Busbars Surge arresters Rated for 45kV Operating voltage 36kV Basic Insulation Level 242kV Current probes, Transducers and data acquisition units to be included Current and Voltage transformers of at least 0.5 class or better Rated voltage of 36kV and current as per MW class Data acquisition unit sample at 2kHz or better with 12 bit resolution and chain accuracy of 1% of full scale value Required software for analysis Voltage dip and test system design according IEC Voltage dip resolution Time adjustment of dip length with 1ms Voltage dip level definition with 1-5% steps of nominal voltage Min voltage dip time 100ms Max voltage dip time ms (however depending on influencing factors of the test site => typical min) PLC Control System Time compensation of circuit breakers Different dip configurations (1-phase / 2-phase / 3-phase) Different dip sequences (single dip / double dip / step dip) Temperature monitoring for the inductances UPS buffered Page 8 of 14

10 Phase angle switching for testing reproduction/repetition Personal and functional safety requirements and standards Emergency stop system with multi surveillance systems Signaling Column Signal horn Mimic Table UPS for control and lights Mains contactor (WIP-Relais) Pressure relief vent Emergency lights Current transformers Digital protection relays Earthing equipment for the Switching Container Earthing equipment for the Reactor Container Surge Arresters Voltage relays Equipment Main components for test ABS switchgear Series reactance s Short circuit reactance s Circuit breakers Two-phase disconnector s Measurements Single-phase Voltage Transformers Single-phase Current Transformers / Transducers Surge arrester protection Phase-to-earth Surge Arresters Phase-to-phase Surge Arresters Page 9 of 14

11 Series Reactance Surge Arresters Short Circuit Reactance Surge Arresters Test system containers Air dehumidifier Heating system Temperature range - 10 C to + 40 C Page 10 of 14

12 ANNEXURE - C Invitation to Submit Expression of Interest (EOI) for c o m p r e h e n s i v e Low Voltage Ride Through Testing & measurement services for Wind Turbines. 1. Introductory Details: a. Name of the equipment supplier b. Whether it is a Govt. /Public/Private Sector/Partnership/Proprietorship firm c. Address with phone/fax numbers d. Name of the Contact Person: Name: Designation: Tel.No.: Mobile no.: ID: e. Annual Turnover for the previous three years Brief profile of the equipment supplier : 3. MNRE approval no. and details if any (Pl. attach a copy of the approval) 4. Experience in supplying the similar type of the above equipment. Briefly specify the details of the company supplied 5. Equipment Compliance certificates as per IEC/IEGC if any 6. Date of Visit to NIWE for technical discussion if any (ref Annexure D) : : : : 7. Additional information if any : Authorized Signatory with Designation Page 11 of 14

13 ANNEXURE-D PROOF FOR TECHNICAL DISCUSSION/ CLARIFICATION Name of the person Designation Mobile No: ID: Company Name Address Phone No: Purpose of Visit Technical discussion/clarification for c o m p r e h e n s i v e Low Voltage Ride Through Testing & measurement services for Wind Turbines, with reference to NIWE EOI Signature Signature of the NIWE official with seal This should be submitted along with the EOI Document. Page 12 of 14

14 ANNEXURE-E EOI SUBMISSION FORMAT Sl.No. List of Documents to be enclosed Remarks 1 Cover letter illustrating the Authorized Official s signature 2 Annexure C duly filled in and signed. 3 Copies of the Registration / Incorporation certificate Pan No./ Income Tax Returns GSTIN Organizational Structure 4 Copies of the certified Audited Statement of Accounts or Separate Audited certificates confirming the turnover for the last three years 5 Copy of MNRE Registration Certificate if any List of relevant Experience and capacity 6 order/sanction letter & certificate of completion 7 CVs of Experts and Professionals within Organization 8 Brief Report with complete technical details for this EOI 9 Annexure D duly signed by the NIWE official (if any) 10 Any other Documents relevant for Assessment & Evaluation Page 13 of 14

15 ANNEXURE-F EOI Eligibility Criteria Criteria Sub- Criteria Weightage* Break-up of Weightage Past experience of the firm with similar requirement 20 Financial Strength of the vendor 10 Turnover figures of the last three years Net profit figures of the last three years 5 5 Quality accreditations, licensing requirements 20 Manufacturing capabilities/tie-ups 10 After-sales support infrastructure 15 Product support 15 Total Remarks : The bidder who secure minimum of 60 out of 100 shall be eligible Page 14 of 14