DANVEST POWER UNIT. with special Low Load Unit for wind-diesel power stations

Transcription

1 DANVEST POWER UNIT with special Low Load Unit for wind-diesel power stations Controls weak or isolated grids - and gives top power quality extremely low fuel consumption and maximum exploitation of renewable energy DANVEST ENERGY A/S

2 Danvest Energy A/S launches a new generation of Wind-diesel systems Diesel fuel Loss The production of electricity by means of diesel generators is an extremely reliable and widely used technology, the only disadvantage being the high fuel consumption due to low efficiency (35-40%). This has resulted in a demand for generating methods which combine the reliability of the diesel plant with the advantages of renewable energy. Power - supplied by diesel generator alone (efficiency approximately 35%) Utilisation of the waste heat produced by the diesel engine can increase the efficiency and enable the production of fresh water by desalinating sea water. Diesel fuel Waste energy for utilisation Loss The illustrations show the energy flow and the energy balances achieved by employing different forms of operation. Production of electricity by means of wind turbines is also well known and the newest types of turbines give excellent results. Until now the limitation has been that it was necessary to control them via the electricity grid which limited their contribution to 30% of the total electricity demand, which again made them unsuitable for use on weak grids. Diesel power with exploitation of excess heat Wind Diesel fuel Waste energy for utilisation Loss Combined diesel and wind power (wind power supplying 30% of consumer load) Wind Diesel fuel Waste energy for utilisation Loss Combined diesel and wind power (wind power supplying 80% of consumer load) Wind 100% wind power. Diesel engine engaged Surplus energy Remote locations with weak or isolated grids typically involve high costs and many additional installation problems. Danvest Energy A/S solves these problems by providing the wind turbines with a control unit which replaces the controlling function of the grid. The result is that a larger number of turbines can be installed and diesel backup only becomes necessary when the wind contribution is insufficient. Wind-diesel systems have previously been inappropriate due to the lack of a simple and reliable control unit to replace the controlling function of the grid. The plants were complicated and the quality of the generated power was unacceptable in situations when the diesel engines were supplying less than 25-30% of their full load capability. The Danvest system makes wind-diesel installations complete and combines the reliability of diesel generators with the maximum exploitation of renewable energy and the optimal utilisation of any excess energy. Danvest Energy A/S has many years experience of development and installation of diesel engines and generators for a wide range of different applications. Danvest Energy A/S has developed a simple, robust and extremely reliable wind-diesel stand alone system. A test installation has been running from supported by the Danish Government Energy Agency. The plants exploits the advantages of both wind turbines and diesel generators which results in an outstanding improvement of the environment on an economically advantageous basis. Vital parts of the Danvest system are protected by patent. 2 Danvest Energy A/S combines and controls the entire process optimally

3 Danvest plants with low load units give you all the advantages Danvest Energy A/S has developed an entirely new control concept for the combination of renewable energy and diesel generators for the production of electricity and fresh water. State your requirements - we will meet them High quality and efficiency Environmentally sound Diesel back up at isolated locations with weak grids 100% electricity supply 24 hours a day - independent of weather conditions - no need for energy accumulation, batteries etc. - up to 100% supply from renewable energy sources Absolutely top power quality and economical running costs The lowest possible fuel consumption and minimum soot formation Functions perfectly without the diesel engine running when sufficient wind power is being generated Use of the excess energy from the wind turbine and the diesel generator for - fresh water production - district heating, cooling etc. - industrial processes A robust, simple, reliable and easily maintained plant with extensive use of standard components Can be used together with almost all makes of standard engines and with existing plant and grids Functions optimally with all standard wind turbines Can be connected directly to existing stand alone systems Delivered in containers ready for installation Can be supplied with data registration, remote control etc. Engineering and commissioning on site are included Solutions using natural gas engines, solar energy etc. are also available The Danvest system has been thoroughly tested in partnership with the Danish government test station for wind energy, Risø National Laboratory, Test Station for Wind Turbines, which has supervised the test process and has produced a report based on measurements and data gathered over the 26 month test period. Danvest Energy A/S combines and controls the entire process optimally 3

4 Danvest low load units provide optimal running conditions Wind turbines Remote monitoring Wind-diesel gen.set Bus bar Central controller Dynamic dump load Modern standard diesel generator plants are very suitable for use as backup systems when there is insufficient renewable energy to cover the network load. The unique properties of the Danvest system are that the generator plant controls and maintains frequency and voltage and also provides 100% supply reliability. Three gen.sets - one for standby Power production Block diagram showing the interface with the electricity grid and with wind turbines Diagram of the entire system Waste energy Power consumption In the Danvest system the diesel engine is equipped with a low load unit which reduces the fuel consumption under low load conditions and enables the engine to run for long periods with a minimum of soot formation. Using standard components for all the important functions results in an extremely simple and reliable system. The standard components are A generator system with a low load unit A main cooling system, thermostatically controlled, with a heat exchanger Dump load/preheater with control system Switchboard unit for control of the entire system Computer with control and registration system In addition, for fresh water production: Exhaust gas heat exchanger Distiller with filter for the treatment of fresh water A specially developed cooling circuit absorbs the excess heat from the diesel engine and also the surplus energy from the wind turbines and makes it available for production purposes. The entire system remains extremely stable because the cooling system absorbs the large energy fluctuations caused by the extreme variations in the available wind energy, the power consumption and the network load. % Duration curve Frequency To further compensate for these constantly changing conditions the rotation of the engine is stabilised. This smoothes the operation of the control system and ensures that the engine can achieve a normal, long life. Efficiency The total system achieves a high efficiency, up to 90-95%, as a result of maximum wind exploitation combined with optimal production of fresh water Low load High load Frequency deviation (Hz) The quality of the electricity produced with the diesel engine disengaged according to the gathered test results Frequency regulation The governing system for the engine and the generator, which is an integrated part of the entire control system, stabilises the frequency and voltage. An additional damping control function - equivalent to the engine governor - stabilises the large variations of power output and demand so that the governor itself can operate more smoothly. This same regulation function is in operation when the engine is disengaged. The combination gives an exceptionally dynamic and reliable frequency stabilisation. 4 Danvest Energy A/S combines and controls the entire process optimally

5 The Danvest system optimally exploits renewable energy Wind turbines begin to deliver power when the wind speed exceeds 4 m/s and maximum output is achieved at about 15 m/s. By far the largest proportion of wind power is produced within the average wind speed of 7-10 m/s. An ideal installation should include enough wind turbine capacity to achieve 100% of the required power at a wind speed of 7-10 m/s. Fuel litres/h Power kw 100% The Danvest system ensures that the wind power is always fully utilised with an absolute minimum of diesel backup. Waste energy This results in the following possible generator loadings 100% when there is no wind. The generator load falls automatically according to the increase in wind power generated. Fuel litres/h Power kw 100% Wind speed m/s 5-8% for governing of the frequency and voltage when the wind power covers the demand totally. Surplus energy Engine stops when the wind power is greater than about 115% of the demand the engine is disengaged and stopped. The generator continues to run in order to supply the network with reactive power and to control the voltage. Waste energy Engine starts when the wind power falls below about 110% of the demand the diesel engine is started automatically and instantaneously. After every restart the engine continues to run for a specified number of minutes before the stop function can be reactivated. The sequences and limits for the stop and start functions are adjusted to suit local working conditions so that the desired protection against power failure is achieved. In addition the stop function can be manually disengaged. Fuel litres/h Power kw Waste energy 100% Surplus energy Wind speed m/s The diagram shows that more and more fuel is saved as the wind turbine capacity is increased. 100% electrical power supply can be achieved using wind power even at low wind speeds. In this case it may be possible to run without the diesel engine for long periods. The Danvest system allows for the installation of any number of turbines and this means that diesel backup only becomes necessary where there is little or no wind. The Danvest system gives the customer total freedom of choice concerning the achievement of the desired specifications with reference to safety, the environment and low running and maintenance costs. Graphs of the achieved performance as the wind turbine contribution varies relative to the consumer electrical load. Generator module / fuel consumption Wind turbine / fuel savings EUR/kWh Wind speed m/s The Danvest system ensures that environmentally friendly solutions are also safe solutions with the very best economy in running costs. The production cost including financing and depreciation of a Danvest system and wind turbines is shown here in relation to a fuel price of EUR 0.28/litre, a saving of approximately 45% 0 0 Payback period After payback period Estimated production prices for kwh based on a 1.5 MW consumer supply wind-diesel system Fuel price: 0.28 euro/litre Traditional diesel power system Wind-diesel power system Years Danvest Energy A/S combines and controls the entire process optimally 5

6 Danvest power units are delivered in modules ready for installation Plant design A Danvest plant consists of three fabricated sections. They are supplied in standard 20 feet containers which contain the following - at least one generator module - one service module - one office/store module The containers can be placed in such a way that a totally enclosed area is created between them where additional equipment is placed. The containers are painted in the customer s chosen colour and function as a complete station which fits in with the surroundings. Small plants (up to 200 kw) are delivered in a single 40 feet container. Extra standard modules can be added at a later date if the capacity needs to be increased. Generator modules The modules are specially constructed for use in winddiesel systems. There are several special components which optimise the functioning of the diesel engine under low load conditions. The generator unit is equipped with a low load unit and the diesel engine is pre-heated. Under low load conditions the water cooling system is bypassed and the ventilation of the container is minimal. As soon as the load increases the ventilation is increased and the controlling system is activated. The container is heat and sound insulated, and a very low external sound level is achieved by means of both a special, long-life silencer on the exhaust system and an exhaust heat exchanger. Capacity The container concept is applicable for plants from 100 kw up to about 1,200 kw per module. It is recommended that at least 3 generator modules should be installed, each with a capacity which allows 2 to handle the total power demand with 1 unit on standby. A plant with 5 generator modules can supply a maximum of approximately 6-7,000 kw. Larger or smaller plants can be produced according to the customer s specifications. The container concept is ideally suited for the control of wind turbines or wind power farms with a capacity from about 100 to 6,000 kw. Fresh water production capacity is in the order of m 3 /day *29. *30. * Generating set module/section Service module/section with special tools Machine hall/panel section with ventilation Generating set Low load unit Engine preheater Exhaust exchanger Dump load preheater Distiller Heat exchanger Pump unit Thermostatic valve Coolant resource with pump Fuel day tank Fuel fine filter Air intake louver Silencer well Starting battery with charger Engine terminal box Seawater pump Freshwater treatment filter Switchgears for consumer, wind turbines, generating set, aux + monitoring, dump load preheater Computer for monitoring Controller for dump load preheater Seawater resource Seawater transfer pump Customer supply An example of a standard Danvest system with fresh water production. Capacity Control power for wind turbines Fresh water production 500 kwe 800 kw 16 m 3 /day 6 Danvest Energy A/S combines and controls the entire process optimally

7 The Danvest system optimally exploits your own optimal solution A wind-diesel plant is always an integral part of the local electricity supply and is often an essential source of fresh water. All the significant parameters concerning the day-to-day running of the plant must be taken into consideration in the planning stages. This results in an optimal solution with the highest efficiency. Danvest Energy A/S uses a calculation system which can analyse a proposed solution and provide information about running costs, repayment period, fuel savings etc. Danvest Energy A/S would be very pleased to send you a proposal based on you specifications and needs, of course entirely without obligation. In order to achieve the highest degree of accuracy we kindly ask you to send us as much of the following information as possible a. Maximum daily power demand in kw b. Minimum daily power demand in kw c. Predicted average daily production in kwh d. Predicted annual production in kwh e. A description of the seasonal variations in production f. Annual average wind speed in m/s g. A description of seasonal variations in wind speed, especially concerning any possible large variations from the average h. The daily demand for fresh water in m 3 per day i. The predicted annual demand for fresh water in m 3 per year j. The demand for heating or other energy-consuming process in kw per day k. The predicted annual demand for heating etc. in kwh Examples of small Danvest plants in 40 feet containers Left: wind-diesel plant with desalination Right: wind-diesel plant without desalination The service module is an important part of any Danvest plant. Special tools and spare parts are included so that service and maintenance can be carried out with the maximum safety and quality. In an existing system is to be wholly or partly integrated with a proposed plant we need the following information l. The number of existing generator plants, the manufacturer, and the production capacity in kw for each individual generator plant m. The age and condition of each of these plants n. The maximum daily power demand in kw o. The minimum daily power demand in kw p. The average daily production in kwh q. The annual production in kwh r. Fuel consumption in litres/h s. Fuel consumption in litres/year For the financial calculations we need t. Fuel price (gas oil) in euros (EUR) per litre u. The present production price and sale price per kwh v. Special conditions concerning taxes and duties on fuel, electricity etc. We market and produce individually custom-designed plants so we would ask you to supplement the above information with any other information and conditions which you feel are relevant in order to achieve your desired results. Danvest Energy A/S combines and controls the entire process optimally 7

8 Danvest power units are advantageous for desalination Fresh water production Standard distillers are used and these are reliable and easy to maintain. Distillers consume all the excess heat and produce fresh water from sea water. If there is insufficient excess heat the plant can be adjusted to automatically increase the motor load until the desired production is achieved. If fresh water production is the primary function of the plant it can be supplemented with low-energy fresh water systems which exclusively use electrical power. Danvest guarantees efficient delivery Danvest plants are complete plants ready for connection and operation. Delivery is ex works with all the installations completed and tested at the factory. All components and the necessary spare parts and tools are placed in containers for normal container transport. Set up on site, connection to the external system and regulation can be carried out easily and quickly. Included in Danvest Energy A/S services are the supply of comprehensive instruction and service manuals and the training of the customer s staff. In the planning stages Danvest Energy A/S supplies all the necessary drawings and measurements for the customer to design the foundations and prepare the external connections. The Danvest Energy A/S programme Diesel power stations Wind-diesel standalone power stations Wind-diesel-solar standalone All types with or without desalination The Danvest system is the best solution for Environmentally sound energy supply Danvest Energy A/S Tuborg Boulevard Hellerup Denmark Thomas Qvist Vestesen CEO Danvest Group phn mob thomas.vestesen@danvest.com Danvest Energy A/S 12/2008