Case study/overview of applying an IEC 61850 parallel redundant protocol communications network on a university campus power micro grid distribution and generating system

Maintaining a coordinated power distribution network with multiple power sources and numerous network power connections can be very challenging. For some systems, these various combinations for loads and sources that allow power to flow through a customer's distribution grid can also create unsafe conditions for the distribution equipment as well as the operators who work in close proximity to the equipment. The need for a coordinated system in this environment is critical. In the past, methods to maintain coordination or control between devices was done by implementing a hard wired input and output system connecting the digital status of interlocking contacts or to utilize a proprietary communications protocol that only allow devices that operate under that protocol to be connected. Utilizing hard wired connections between protective devices for control and logic can create a number of challenges based on the layout and the geography of the distribution network. A proprietary communication system limits the devices that can participate to the one manufacturer for the devices that need to be interconnected. In many cases these methods are harder to implement and not flexible for any future changes to the logic. This paper will look at implementing a communications and control scheme utilizing IEC 61850 protocol between intelligent electronic devices (IEDs) for a university campus power distribution micro grid which includes multiple power sources consisting of steam driven generators and utility grid connections. Loads vary throughout the school year which requires shifting the power flow on the campus distribution grid based on time of the year and the environment. Steam reduction via power generation and buying power off the grid are other variables that factor into the scheme for campus power flow. Steam reduction, generated power, campus load and purchased power must be constantly monitored and adjusted for optimal efficiency and cost.