Research shows how microgrids improve network stability

Technology News |
By Nick Flaherty

Research from UBCs Okanagan School of Engineering are describes a power system operation that will consist of multiple microgrids–separate grids operating like individual islands that can disconnect from the main power supply and run independently.

These islanded systems will provide electricity to smaller geographical areas, such as cities and large neighbourhoods. In the case of a failure in the main system, the local grid operation system will keep the lights on. “The microgrid will recognize the problem in the main power system and will isolate itself, avoiding previously inevitable power outages,” said Yuri Rodrigues, a UBCO electrical engineering doctoral student and study co-author. 

However the supply of power in this mode depends on locally available generating reserves, which means that conserving energy is vital to keeping the islanded grid operational for as long as possible. The microgrid can distribute power at a slightly diluted level that won’t negatively impact electronics while allowing power to flow for longer periods without running out. “Our new proposed method takes a more sustainable approach, allowing the microgrids to conserve power so any shortfall can be better handled by the microgrid itself,” he said.

The challenge with using this concept in a larger system is that those larger systems may experience too much instability and so the entire system shuts down. Rodrigues points to a similar occurrence in 2003 when most of the eastern seaboard of North America collapsed leaving millions in the dark.

Many safeguards already exist within power distribution systems to enlarge the system operation, but they only help by prioritizing power based on urgency, meaning hospitals and infrastructure would take precedence over regular consumer needs, he says.

This new microgrid approach, backed by several agencies in Brazil, could soon be an option for power systems around the world. It would also allow for global energy conservation that would decrease the network’s demand and improve the self-sufficiency of the microgrid as a whole. According to Rodrigues, their testing indicates this approach can significantly enhance microgrid autonomy and stability with no impact on the wider power system.

“There are many components that make up a power system from generation to distribution before electricity arrives in the outlets of consumers,” he said. “Creating a system this is more self-sufficient, robust and sustainable is key to creating a reliable and blackout-free experience for future power consumers.”

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