Photovoltaic mini power plant for stand-alone systems
The project has developed a new Mini Power Plant technology for photovoltaic applications in developing countries with no grid electricity supply. The project has developed, constructed and tested photovoltaic Mini Power Plants which delivers 230 V AC in the power range 0-3 kW.
Based on results achieved in an EFP-95 project a new power module with a nominal power of 3kW and a peak power of 6kW will be developed with an efficiency of more than 97% and an iddle loss of less than 15W. The power module will be the heart" of the inverter in a solar-panel connected mini power plants. The inverters can be coupled in paralel and hence from a photovoltaic mini grid. The workpackages (WP) are: WP 1 Specification; WP 2 Evaluation of concept; WP 3 Design; WP 4 Breadbording; WP 5 Construction of prototype; WP 6 Test; WP 7 Evaluation and report. Total duration is planned to 36 man-months and 15 calendar months. The prototype will be tested under extreme conditions in Africa at the non-grid testfield of the South African Power Supply Company (Eskom). The finished product will be produced by "Powervision", Harare, an electronics producing company with great experience in inverter production especially designed for uninterruptable power supply systems. The product is expected to be a major contribution to Danish export of know-how within renewable energy systems
The Mini Power Plants have power quality and safety standards which fulfills european standards and therefore gives access to use of commercial consumer electronics. The Mini Power Plants have a battery back-up of any desired size for load leveling and night supply. The inverters of the Mini Power Plants can be modular connected to fulfill any required power- or energy demand. A single Mini Power Plant can as such be updated to a mini grid with additional inverters, solar panels and batteries. 5 Mini Power Plants have been build. One has been tested in Denmark, one has been tested in South Africa and three has been tested in Zimbabwe. Alle plants have worked reliable and all have fulfilled specifications. Main specifications: Nominel capacity 3kW (continuert); Overload capacity 160% for 1 min.; Output frequency 50 Hz +/- 1%; Efficiency 95.5 at 1 kW
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