OMICRON Magazine

GET OFF THE ROOF! Part 2: Commissioning a floating PV system Many companies already have energy generation plants to reduce electricity procurement costs and enable production to continue or facilitate controlled shutdowns during extended power outages. In an island grid, i. e., when the higher-level network is unavailable, the generation plants, storage facilities, and load management systems must all function perfectly together. And it works both ways: During the energy transition, these industrial cells can support the stability of the public power grid by contributing to renewable energies. Both of these aspects are being explored as part of the INZELL project. Powerful PV system The Max Bögl Group’s industrial cell data is impressive: Approx. 25.5 GWh of electricity is generated each year. Alongside wind turbines, photovoltaic systems are the most significant contributors to electricity production. Roof installations provide a capacity of approx. 2.5 MW. However, the floating PV park on the company’s pit lake is particularly remarkable. This photovoltaic system boasts a connected capacity of 1.6 MW. Fully operational We were asked to commission the floating photovoltaic system. “We perform primary testing on the system, checking the phase assignment and the transfer ratio of the current and voltage transformers. It makes no difference whether the photovoltaic system is installed on a roof or a lake,” explains Michael Biller, Application Engineer with OMICRON Engineering Services. “The uncoupling connection also needs to be checked. For example, in the event of a fault, a grid disconnection will cause the photovoltaic system to shut down immediately. This protects both the grid and the generator itself.” In addition to performing standard tests, engineers checked the integration of the photovoltaic system into the signaling and telecontrol technology. These checks ensure that the measured values and messages from the photovoltaic system are reliably transmitted to the control center. The engineers also checked the photovoltaic system’s remote control. The floating photovoltaic system has enabled the Max Bögl Group to substantially increase its solar capacity for electricity production – despite not having suitable roof space. “Our tests confirmed that the system was working properly and meant that the photovoltaic system could be fully commissioned,” says Michael. Major research project The positive effects of floating photovoltaic systems are currently being exINZELL is a research project that is currently being carried out in the Max Bögl Group’s industrial cell in Sengenthal, Germany (read more about it in issue 1/2023 of the OMICRON Magazine). Once the research project has been completed, the aim is to be able to use the industrial cell as an island grid during an emergency situation. Numerous generators that draw on renewable energy produce the power required for the industrial cell. For instance, a floating photovoltaic system has been installed on the company’s pit lake. OMICRON is actively involved in the INZELL project and was also responsible for commissioning the photovoltaic system on the lake. 26