What are the main grid code requirements for renewable energy plants?

Grid codes specify technical requirements for connection: Active power control (curtailment on command, ramp rate limits), Reactive power capability (power factor range, voltage support), Frequency response (droop response, synthetic inertia for wind), Fault ride-through (remain connected during voltage dips), Power quality (harmonics, flicker limits), Protection coordination (anti-islanding, fault contribution), Communication and control (SCADA interface, real-time data), and Compliance testing. Requirements vary by voltage level and capacity. Recent codes require grid-forming capability for high renewable penetration.