Energy Insiders - a RenewEconomy Podcast No spin needed for renewable gold rush
Dec 4, 2025
Bruce Miller, an electrical engineer specializing in energy systems, discusses the future of grid stability without reliance on spinning machines. He illustrates the role of inverters and highlights the need for trials to enhance operator confidence. Helen Haines, an independent MP, emphasizes the importance of early community engagement in renewable projects, advocating for fair benefits and electricity discounts for regional areas. She shares successful examples of community negotiations and warns against misinformation, underscoring the need for transparency and trust-building.
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Inverters Can Replace Spinning Machines
- Inverter-based systems can replicate the functions of spinning machines by using fast power-electronics control instead of physical inertia.
- Bruce Miller argues electrons don't care where they come from, so properly controlled inverters can deliver system services.
Fault Current Changes Protection Needs
- Fault current behaves very differently between synchronous machines and inverters, affecting protection schemes.
- Bruce Miller explains relays can still detect faults but protection design must adapt (distance/differential relays, ride-through capability).
Mixing Grid-Forming With Grid-Following Works
- A mix of grid-forming and grid-following inverters (roughly 20/80) at strategic locations can stabilise faults and support wider inverter fleets.
- Properly placed grid-forming units let grid-following devices operate reliably.