Mauritius’ first grid-connected solar plant feeds into the country’s 66 kV grid and meets all the challenges that an island grid with its inherent imbalances typically entails. To this end, skycontrol - the heart of skytron energy’s power management system – executes a highly flexible control scheme. On the one hand, automatic, pre-programmed control functions provide active and reactive power capping; maximum ramp rate; frequency control based on power shifting; voltage stabilisation; and reactive power setpoint control. Manual adjustment of grid feed parameters, on the other hand, has been made possible by skytron energy’s skycontrolri_product_information_en_140519_web.pdf" title="Initiates file download" class="download">RICC - Remote Interface Control Center. This user interface has been developed especially to meet the country’s method of grid control and stabilisation: the control command messages are relayed by CEB, Mauritius’ Central Electricity Board, and the plant operator must respond immediately by manually entering the new setpoints for active and reactive power, power factor, ramp rate and by selecting pre-defined control curves applicable at that moment. The connection to the plant and the skycontrol controller is established directly via the local plant intranet or remotely by way of a secure VPN link.
Another important criterion for efficient demand driven power feed into the island grid of Mauritius is the knowledge of how much power can be generated and made available by the solar plant. Weather-model based production forecasts, updated several times a day, supplying estimates of hourly production for up to 5.5 days into the future are provided by the PVGuard performance analysis tool. This SCADA platform is part of skytron energy’s real-time monitoring and supervision system installed in the Bambous plant. It is not only the plant operator’s daily tool for remote alarm diagnostics; it also offers all the functions necessary for reporting and long-term performance analysis.
Plant performance and all live data can also be viewed directly at the plant. This is ensured by skytron energy’s on-site server skyserv LM which gives the operator instant access to actual values of all plant data at 1 minute resolution as well as selected power data such as active, reactive and apparent power, frequency, current and power factor at one second intervals measured at the grid connection point.
“Mauritius has a great solar outlook with a potential average radiation yield of some 6 kWh/m2 every day. The country has ambitious plans to reduce its dependence on imported petroleum products and encourages the advancement of solar power generation. With this first ground-mounted plant we have proved to the country’s electricity authority that renewable energy enhances grid stability”, confirms André Pohl, CEO of Tauber Solar Energietechnik GmbH, the project developer, who worked in partnership with Conecon GmbH. “With skytron energy we have found a highly competent partner whose expertise in flexibly adjusting their control system to local grid requirements has helped tremendously to integrate this first solar plant into the island’s electricity grid.”
About skytron energy
skytron energy has been developing integrated monitoring, control and supervision systems since 1977. Now one of the leading suppliers in the industry, specializing in utility-scale and commercial power plants, it has installed monitoring and control systems in more than 600 plants with a total capacity of 5 GWp. The company’s core competencies are plant condition monitoring, power plant control, remote plant supervision, system migration of existing power plants, operation & maintenance, and PV asset management. skytron energy is headquartered in Berlin, Germany. As a technology leader, skytron energy has received a number of prestigious awards, such as the highly coveted InterSolar Award for the “PVGuard” Supervision Platform and for the “StringGuard” string current measurement system.
The new ArrayGuard® CP combiner boxes have been designed to meet the demand for highly power-efficient BOS components in utility-scale photovoltaic installations. Berlin-based skytron® energy is a renowned supplier of high quality monitoring, control and supervision systems to the renewable energy sector. Its product range includes the well-established ArrayGuard® combiner-box series for PV systems, first launched in 2006.
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