Smart inverters and their grid services
Smart inverters are advanced solar inverters with communication and control features that support grid stability and provide services beyond simple DC-to-AC conversion. They help integrate distributed solar while enhancing safety and flexibility.
Core smart inverter functions
- Volt/VAR control: Regulates voltage by adjusting reactive power to help maintain grid voltage within acceptable ranges.
- Frequency response: Can autonomously inject or absorb power to help stabilize grid frequency during disturbances.
- Ride-through capability: Allows solar systems to remain connected during short voltage or frequency deviations.
Additional capabilities
- Remote monitoring and control via communication links.
- Dynamic power curtailment and ramp-rate control to manage rapid changes in solar output.
- Anti-islanding protections and seamless transition during grid events.
Benefits to grids and customers
- Improved reliability: Smart inverters assist in voltage and frequency regulation, making high penetrations of solar more manageable.
- Grid services revenue: In some markets, smart inverter functionalities enable participation in ancillary service markets.
- Safer interconnection: Better behaviors during disturbances reduce risks associated with distributed generation.
Deployment considerations
- Utility requirements: Many utilities now require smart inverters for new interconnections and specify settings or standards.
- Communication standards: Interoperability and cybersecurity are important for remote control capabilities.
Smart inverters are an important tool for modern grids, providing operational flexibility and enabling higher levels of distributed renewable energy integration with minimal disruption.