Danvest - Power Box
The Danvest Power Box® is a 20 or 40 foot container housing a conventional diesel generator fitted with the unique Danvest system. Wind turbines or solar systems simply connect. The unique Danvest 'low-loading' capability enables high operational fuel savings.
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Danvest Power Box® features
Danvest Power Box® features
- A high speed 1500 or 1800 rpm CAT or Cummins diesel generator of 100 kW to 1.8 MW capacity per container.
- A low-load unit (LLU) enabling the diesel engine to also operate effectively between 30% and zero load, at a fixed speed, with stable rotations, with minimal soot formation (clean combustion) and at low operational fuel consumption.
- The ability to, boosted by surplus renewable energy, operate the generator in reverse power. The alternator then draws the diesel engine, consuming only a few liter of fuel per hour (1 to 2 liter at 400 kW benchmark) or even zero fuel.
- The ability to stop the diesel engine by declutching it from the alternator when surplus renewable energy hits a set-point. Fuel consumption is zero and the alternator still provides reactive power as it remains connected to the busbar.
- The ability to restart very fast as the clutching in diesel engine is preheated and mildly pre-pressurized.
- The ability to accelerate very fast to needed load without losing frequency control, voltage and reactive power.
- A conventional diesel generator PLC controlling the frequency and voltage when operating between zero and 100% load.
- A reliable dumpload controller securing a fast dynamic load balance between fluctuating renewable energy and variations in energy demand, and taking over frequency control when the generator is in reverse operation or at engine stop.
- A fast and stable spinning reserve at every operation mode.
- The ability to control large amounts of renewable energy, also when this capacity exceeds the generator capacity.
- The ability to use different kinds of renewable power sources.
- The ability to add more renewable capacity later on.
- A power quality of 50 / 60 Hz +/- 0.5 Hz.
- All diesel engine factory warranties apply.
- A simple, robust and reliable design.
- A design lifetime of up to 20 years.
- SCADA / VPN monitoring or else.
In essence Danvest offers a containerized hybrid power solution including integration equipment, busbar, switch gear and master controllers. It is ready for plug and play with solar and/or wind.
Standard components & maintenance
Danvest Power Boxes are built of widely used standard components of the highest quality. Maintenance & repair is executed by existing global diesel engine service networks.
After a short training local operators are able to operate the Danvest system. It is like operating a conventional diesel generator. Danvest centrally monitors all of its operations.
Standard program
Danvest offers indicative capacities of 100, 200, 400, 600, 1000, 1200, 1600, 1800 kW per Danvest Power Box.
The 'Single line' program has the engine + control room together in one container. The 'Multi line' program offers the control room in a separate container to enable large capacities. Dump-load systems above 400 kW are also offered in a separate container.
High earn back capacity
The high operational fuel savings makes projects perform to the max. Danvest project investment recovery periods are 3 to 6 years (including CAPEX of wind and/or solar systems).
Danvest provides 50 to 70% direct fuel savings per year with wind and 30 to 50% direct fuel savings per year with solar systems.* These savings can be as high as 80% when wind and solar systems are combined, all whithout the use of energy storage.
Our engineers will consider site-specific requirements and also ask for the possibilities to add Danvest to existing LFO/HFO power stations. During a project, Danvest will provide guidance service to nominated operational staff.
* Assuming a normal 24 hour demand cycle
How does it Work?
Danvest developed a unique system to combine wind and/or solar power with diesel generators. By applying the reliability of diesel generators in a smart way, Danvest maximizes renewable power utilization and minimizes diesel fuel consumption.
A Danvest fitted diesel engine has the unique abil...
A Danvest fitted diesel engine has the unique ability to 'low-load' while also having a low fuel consumption. To exploit this unique capability, the Danvest design objective is to find the best achievable fit between 'average' wind energy production and 'average' energy demand on a location as the annual fuel savings will then be highest. For that we do not mind to install excess wind turbine capacity in order to force the Danvest diesel generators to operate in the 'low-load' range as long as possible. Danvest likes to be in the right-hand side of the above graph. Within the Danvest approach installed wind turbine capacity can be as high as 150% of diesel engine capacity .
In the above example the diesel engine 'low-loads' when wind speed is 9 to 11 m/s (or when demand drops). The generator reverses operation at 0% load when wind speed is above 11 m/s (or when demand drops), consuming a few liter fuel per hour or even zero fuel. The engine stops when wind speed is higher than 12 m/s (or when demand drops). The dump-load controller secures a dynamic load balance between wind energy fluctuations and variations in energy demand when the generator is in reverse operation or when the engine is stopped.
The Danvest principles also apply to solar power. ...
The Danvest principles also apply to solar power. In the above graph the diesel engine low-loads at 0-30% load when solar power covers 70-100% of demand (07.45). The generator reverses operation when demand is 100% covered by solar power (08.00). The engine stops when solar power produces about 110-120% of demand (08.30). When the night falls, the engine starts up again. The dump-load controller secures a dynamic load balance between solar energy fluctuations and variations in energy demand when the generator is in reverse operation or when the engine is stopped.
- The ‘additional fuel savings’ area in the middle shows the Danvest ability to low-load or stop while still controlling solar power quality.
The above graph shows the ‘cloudy day mode&r...
The above graph shows the ‘cloudy day mode’ of operation. The Danvest system could switch to this mode when solar power quality (dump-load quality) can negatively be affected by weather conditions. In this mode the diesel engine is prevented to be stopped. Reverse power operation at ultra low fuel consumption is then the lowest possible engine condition.
- Optional feature: In some applications it can be worthwhile to leave away the de-clutching (stop) facility.
Operation modes / Working principle
- When renewable energy exceeds energy demand, the Danvest generator is in reverse operation. It is also possible that the diesel engine disconnects from the alternator (magnetic clutch) and stops. The alternator remains connected to the busbar to provide reactive power and to control voltage and frequency (dump-load controller). It also functions as a small flywheel in the rotatory system. The booster effect of the wind provides extreme low fuel consumption in the reverse operation.
- When wind or solar power is decreasing (or when demand grows), the diesel engine automatically clutches in and starts within 1-3 seconds. The engine is pre-heated and pre-pressurized for a fast start-up.
- Up to 30% load the Danvest equipment uniquely intervenes in the functioning of the diesel generator, enabling the engine to effectively operate at low loads for long periods and to accelerate fast to higher loads in 2-5 seconds. At low-load operation the diesel generator also functions as a very soft dump-load
- The grid frequency (50/60 Hz +/- 0.5 Hz) is maintained by fast dynamic load balancing between the fluctuating wind power, the dynamic dump-load controller (pre-heater) and the consumer load
- The grid voltage is maintained by the Automatic Voltage Regulator (AVR) of the synchronous generator - also able to supply reactive power to energize the induction generators in the wind turbines
- A PC based SCADA system with a comprehensive data acquisition capability is located in the Danvest Power Box. It allows operators to oversee the complete system operation
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