Pilot system equipment specification

ASIAN DEVELOPMENT BANK Renewable Energy For Small Towns and Rural Areas __________________ Pilot System Specification April 2004 ITP/Ref 0804 April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 Asian Development Bank Renewable Energy For Small Towns and Rural Areas Client contract No.: TA 3965-MON IT Power reference: 0804 Pilot System Specification April 2004 Contractor: IT Power The Manor House, Chineham Court, Lutyens Close, Chineham, RG24 8AG, United Kingdom. Tel. +44 1256 392700 Fax. +44 1256 392701 E-mail: itpower@itpower.co.uk http://www.itpower.co.uk Document control File path Date: 09/05/02 April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 i SUMMARY This tender specification covers the supply and installation of equipment for two renewable energy and energy efficiency pilot projects in western Mongolia. The request for tenders is split into the following lots, which may be tendered for individually:  PV modules (6 kWp)  PV charge controller (48 V, for 6 kWp)  Wind turbine (minimum 500 W, 48 V; including mast and suitable controller)  Two Batteries (vented or sealed lead acid, 1,000 Ah and 2,000 Ah, both 48V, including battery stand and interconnectors)  Inverter / mains charger (4 units of 5 kW each. 48 V DC, 230 V AC)  Compact fluorescent lights (CFLs) (1,500 units of 11 to 15 W each; 230 V AC)  Dual-tariff electricity meters for 230 V / 50 Hz April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 ii TABLE OF CONTENTS Summaryi 1 Introduction.1 2 Outline System Specification for Pilots1 2.1 Site 1: Zereg (Khovd Aimag) .1 2.2 Site 2: Darvi (Govi-Altai Aimag) .3 3 Scope of Tender - Supply of Equipment .5 3.1 General Conditions.5 3.2 PV Modules .5 3.3 PV Charge Controller5 3.4 Wind Turbine 6 3.5 Batteries .6 3.6 Inverter / Mains Charger 6 3.7 Compact Fluorescent Lights (CFLs) .6 3.8 Electricity Meters .6 4 Submission of Bids .7 4.1 Contact Details 7 4.2 Deadlines for Submission .7 April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 1 1 INTRODUCTION IT Power has been contracted to provide Technical Assistance to the Government of Mongolia for the ADB project TA 3965-MON “Renewable Energy for Small Towns and Rural Areas”. The project aims to demonstrate and promote well designed sustainable renewable energy supplies for rural villages with energy conservation activities and energy demand side management. Two pilot hybrid systems are planned as part of this project: a 6 kWp PV system and a small (500-1,000 W) wind power system. Both systems are to be linked with the existing diesel generator. At both sites, suitable energy efficiency and demand side management measures are to be implemented as well. This document sets out specifications for the two systems. The supply of equipment (Section 3) has been divided into lots. Particular attention is drawn to the general conditions in Section 3.1, which apply to all equipment. Installation will be let as a separate contract at a later stage. The installation contractor will also be responsible for transport, storage and commissioning as well as the supply of miscellaneous equipment. 2 OUTLINE SYSTEM SPECIFICATION FOR PILOTS Preliminary system designs were developed for the two renewable energy pilot sites. All equipment and services tendered must comply with these designs. Further detail for the two sites is given below. 2.1 Site 1: Zereg (Khovd Aimag) Site Background The permanent population of this Soum Centre is relatively small with only around 50 families remaining during the summer months. During the winter, the population increases to around 200 families. The Soum Centre has a 100 kVA diesel generator which operates for four hours per day during winter. Owing to the small population remaining there in summer, the Soum administration cannot afford to operate the diesel generator at all during the summer months (typically, users only paid for the months during which they were connected). PV-Diesel Hybrid System The following pilot system is planned for Zereg: a hybrid system consisting of a new 6 kWp PV system coupled with the existing diesel generator. The schematic in Figure 1 illustrates the system configuration. In addition, energy efficiency measures are planned as detailed below. The PV system will supply electricity to the Soum centre during periods when the generator is not operational. Preliminary designs and system sizing showed that if coupled with demand side management and energy efficiency measures, a small PV system will be able to provide a basic electricity service for the whole of the Soum centre during the summer months. Energy demand will be reduced to the amount available from the PV system by setting the tariff at an appropriate level. During the winter, when solar irradiance is significantly lower and the population and hence energy demand increase, the PV system will operate as a hybrid system with the diesel generator. The diesel generator will operate for a few hours every day and is able to top up the battery. April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 2 The existing mini-grid will be used for electricity distribution. It should be noted that, whilst both diesel generator and PV system will use the same grid, the PV system will not feed into the grid whilst the generator is in operation. A changeover switch will be used. Figure 1 - Preliminary System Design for RE Pilot at Zereg Soum Centre The system will provide a basic electricity service, predominantly to supply electricity for lighting, TV and radio. The PV system will not be able to supply power for high-power appliances such as electric cookers etc. However, as the Soum Centre population currently has no electricity at all over the summer months as well as for twenty hours each day in winter, this will mean a big improvement. The preliminary design assumes a design based on DC coupling. Suppliers wishing to tender equipment for an AC-coupled design should include all controllers and inverters in their tender and submit technical details. Energy Efficiency Measures Energy efficiency measures will be implemented in order to reduce the electricity demand. The biggest impact will be from replacing incandescent bulbs with CFLs, which would reduce lighting loads by an estimated 75%. In addition, poor quality connectors in the distribution system have to be replaced as required, thus reducing distribution losses. At present, some lights cannot be switched off as there are no switches. Lights switches have to be fitted where necessary, so that all lights can be switched off. All fittings such as sockets, light switches, etc have to be made safe and replaced if broken. This applies to all households and institutional buildings. It is anticipated that the local shops will sell Pilot RE System Existing Infrastructure = = PV Array PV Charge Controller 48V DC Battery Mains Charger Inverter 230V ACG Diesel Generator To Mini- grid ~ = ~ = April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 3 replacement CFLs to meet future demand. At present, CFLs are not generally available in the Soum Centre. Electricity will be metered and charged per kWh at a relatively high rate, to encourage energy efficiency. Dual tariff meters will be installed to allow a higher rate to be charged for PV supply, reverting to a lower tariff during the times when the diesel generator is running. This will be effected through simple timed meter operation. 2.2 Site 2: Darvi (Govi-Altai Aimag) Site Background The permanent population of Darvi Soum Centre is around 140 households, increasing to over 200 households during winter. A 100 kVA diesel generator supplies electricity for households, institutional buildings, a water pump for drinking water, and for the operation of a district heating system. The diesel generator is operated daily all year round, for about three hours per day during the summer, and up to 12 hours per day during the winter. The layout of the Soum Centre is such that all institutional buildings are located around a central square, and are connected to the same feeder of the mini-grid. Hence the institutional buildings can easily be supplied independently of the households. The wind resource of Darvi is medium, with an average wind speed of 3.8 m/s, according to meteorological data contained in the JICA Master Plan Study. It is therefore essential that the wind turbine is capable of producing power at low wind speeds. Wind-Diesel Hybrid System The following pilot system is planned for Darvi (Govi-Altai): a hybrid system consisting of a new 500-1,000 W wind power system coupled with the existing diesel generator. The system will supply power to the hospital, with any surplus being available to other institutions. The diesel generator, which operates for a few hours every day, will be used to top up the battery when there is insufficient wind. The schematic in Figure 2 illustrates the system configuration. In addition, energy efficiency measures are planned as detailed below. The wind energy system will power lights and hospital appliances such as vaccine refrigerator, maternity lamp, UV steriliser and computer/printer. The wind system will not supply power for high-power appliances such as electric cookers etc. If surplus energy is available, this will be made available to the school dormitory and other institutional buildings, using the existing mini-grid for transmission. It should be noted that the inverter will not feed into the mini grid whilst the generator is in operation. Changeover switches will be used. The preliminary design assumes a design based on DC coupling. Suppliers wishing to tender equipment for an AC-coupled design should include all controllers and inverters in their tender and submit technical details. Energy Efficiency Measures Energy efficiency measures will be implemented in order to reduce the electricity demand. The biggest impact will be from replacing incandescent bulbs with CFLs, which would reduce lighting loads by an estimated 75%. In addition, poor quality connectors in the distribution system have to be replaced as required, thus reducing distribution losses. At present, some lights cannot be switched off as there are no switches. Lights switches have to be fitted where necessary, so that all lights can be switched off. All fittings such as April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 4 sockets, light switches, etc have to be made safe and replaced if broken. This applies to all housholds and institutional buildings. It is anticipated that the local shops will sell replacement CFLs to meet future demand. At present, CFLs are not generally available in the Soum Centre. Figure 2: Preliminary System Design for Pilot at Darvi Soum Centre Pilot Battery System G 48V DC Battery Mains Charger Inverter 230V AC Diesel Generator To Households To institutions Hospital main switch Existing Infrastructure ~ = ~ = To Hospital Appliances April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 5 3 SCOPE OF TENDER - SUPPLY OF EQUIPMENT The equipment required has been divided into lots. Suppliers are invited to bid for one or several lots, to realise savings regarding transportation costs. However, a separate price must be shown for each lot. 3.1 General Conditions In addition to the supply of equipment as specified in this document, tender prices must include suitable packaging of goods, appropriate insurance, and the cost of transportation to a storage facility in Ulaanbaatar. A delivery date must be given with each tender. Deliveries no later than mid June are anticipated. Make and model as well as technical specification should be provided for each component. The most important criterion for all equipment is reliability. Equipment must be extremely reliable, because due to the remote location of the sites, any future repairs or replacement of components will be very expensive. All equipment must be suitable for the specified locations, especially the extremely low temperatures and harsh weather conditions. Equipment must have low maintenance requirements, and it should be possible for local staff to exchange parts without the need for specialists to be brought in. prevailing. Tenders should demonstrate that equipment offered fulfils these criteria. Suppliers should provide references of their equipment having been used successfully in locations with similar conditions. The need for the provision of spare parts should be considered, and tenders should include recommendations for key components to be ordered now and kept as spares, and prices for these should be shown separately. This should enable local O therefore the number of modules supplied must be divisible by 4 (by 2 if modules have 72 cells each). The minimum size for the PV modules should be 75 W; larger modules are preferred. Modules must be certified to IEC 61215 by a recognised Testing Laboratory. A copy of a relevant test certificate should be provided. IV curves of all modules must be supplied (including detail of the test equipment used). IT Power reserves the right to carry out flash testing to verify the power output. 3.3 PV Charge Controller The PV charge controller must be suitable for 6 kWp of PV modules and for charging a battery bank of 48 V DC. The use of several parallel units is permitted, as long as they are able to operate in parallel when connected to a single battery. Ideally, the controller should be fully programmable. Details should be supplied with the bid. April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 6 A display and basic data storage facilities would be desirable options. Details should be provided. 3.4 Wind Turbine A wind turbine for charging a battery system is required. The rated output of the wind turbine should be between 500 W and 1000 W at a wind speed of 12 m.s-1. The wind turbine must be capable of producing power at low wind speeds; the start-up wind speed should be indicated in the bid. The system voltage is 48 V DC. A controller to match the wind turbine should be included in the supply. This must be suitable for charging a 48 V (24 cell) lead acid battery. Ideally, the controller should be fully programmable. Details should be supplied with the bid. A mast to fit the wind turbine should be included in the supply. The minimum hub height is 18 m. Base plate, anchors, guy ropes details are to be provided. April 2004 Renewable Energy For Small Towns and Rural Areas Pilot Systems Specification Version 1.1 ITP/0804 7 4 SUBMISSION OF BIDS 4.1 Contact Details B