First-time charging (FTC) for the IREP AP01 Chinnakampalli solar plant (part of the Pinnapuram Integrated Renewable Energy Project) requires strict regulatory compliance and coordinated energization with the Regional/State Load Despatch Center (RLDC/SLDC) and Power Grid Corporation of India (PGCIL/CTU).

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First-time charging (FTC) for the IREP AP01 Chinnakampalli solar plant (part of the Pinnapuram Integrated Renewable Energy Project) requires strict regulatory compliance and coordinated energization with the Regional/State Load Despatch Center (RLDC/SLDC) and Power Grid Corporation of India (PGCIL/CTU).

Pre-Charging Phase (Regulatory & Site Readiness)Statutory Clearances: Obtain necessary approvals from the Central Electricity Authority (CEA) and the Electrical Inspectorate.

FTC Approval: Secure final First Time Charging (FTC) clearance and start-up power approval from the competent RLDC.

PPA & Metering: Complete tariff/PPA documentation and install check/main interface meters in coordination with the State Transmission Utility (STU).

Telemetry Setup: Ensure SCADA connectivity and real-time data communication lines are active between the Chinnakampalli pooling substation and the SLDC control room.

Pre-Commissioning Checks: Verify all civil, mechanical, and electrical works are finished, including ground earthing checks, cable insulation tests, and transformer oil tests.

Relay Setting Verification: Check relay settings, protection coordination, and circuit breaker interlocks at both the solar inverters and the Pooling Substation.

Switchyard Preparedness: Confirm all SF6 breakers and isolators are clean, gas/oil pressures are normal, and local/remote selection switches are set correctly.

Line Clearances: Ensure all temporary earthing leads are removed from the transmission lines, and issue Permit to Work (PTW) clearances to all teams.

Grid Availability: Coordinate with PGCIL/APTRANSCO to ensure the receiving end (e.g., Orvakallu substation) is ready to accept power.Charging Sequence (Energization)

Operation Code: Request and receive the real-time operational clearance code from the RLDC/SLDC control room.

Grid Side Energization: Energize the incoming transmission line from the receiving grid sub-station to the plant's main pooling switchyard.

Busbar Charging: Close the main breaker (e.g., 220kV or 400kV) to charge the pooling station busbars.

Auxiliary Power: Charge the auxiliary station transformers (typically 33/0.415kV) to energize the plant's internal lighting, cooling, and control supply systems.

Inverter Transformer Charging: Energize the Main Step-Up Transformers (e.g., 33kV/220kV) from the charged busbar side.

DC System Checks: Check all 110V/220V DC battery banks and UPS systems to ensure protection logic and control signals are uninterrupted during charging.

Inverter DC Charging: Power up the Solar Inverter DC busbars by closing the DC switch-disconnectors and charging the DC capacitors.

Synchronization & Power InjectionSolar Array Energization: Gradually close the DC inputs from the PV arrays to the Power Conditioning Units (PCUs)/inverters.

Synchronization: Match the inverter output voltage, frequency, and phase sequence with the grid using the auto-synchronization feature.Infirm 

Power Injection: Close the AC breaker of the inverters to begin injecting infirm power into the grid, strictly operating within the approved RLDC ramp-rate protocols.

Post-Charging Logs & Trial Runs: Submit mandatory Plant/PPC logs (covering voltage control and power factor) to the SLDC and run the plant smoothly to prepare for the declared Commercial Operation Date (COD).