Uninterrupted power from user-friendly system
The automated control and coordination necessary to ensure smooth changeovers between the different power sources in the hybrid system is handled by a complete DEIF control solution. The PV plant is controlled by an ASC-4 Solar controller, and the battery is managed using an ASC-4 Battery controller. The diesel generators are controlled using DEIF AGC generator controllers, and the solution includes an MIB multi-instrument for measuring and combining the power generation of the PV clusters.
The devices are interconnected over a CAN bus, forming a power management system that communicates with the hotel SCADA system over a TCP/IP connection. The system covers the load demand according to the priorities set, keeping power flowing without interruptions and to the satisfaction of hotel management.
“The DEIF system functions really well, especially the prioritisation of power generators,” says Buddhika Sampath. “During the daytime, the battery is charged by the PV panels. Like I said, discharging is particularly useful during a sudden PV drop because it prevents the second-priority generator from starting. Previously, this happened when the load on the active generator rose to 75%. Now, with the battery backup, we are able to wait until the active generator is running at 85%. The system covers the demand without any interruptions. It's running very smoothly.”
In addition to the controllers, the solution includes a DEIF AGI 410 interface that provides a complete overview of the entire plant and which Buddhika Sampath describes as “really easy to work with”.