What are LVRT and HVRT requirements for renewable energy plants?

Low Voltage Ride-Through (LVRT) and High Voltage Ride-Through (HVRT) require plants to remain connected during grid voltage disturbances. LVRT: during voltage dips (fault events), maintain connection for specified time based on severity (e.g., stay connected above 15% voltage for 150ms). Many codes require reactive current injection to support voltage recovery. HVRT: withstand temporary overvoltages. Requirements prevent cascading disconnections that could worsen grid disturbances. Modern inverters achieve LVRT through fast current control and DC link voltage management. Grid codes specify voltage-time profiles defining required ride-through capability.