Compliance Studies on Grid Code for Renewable Energy Projects by CEA (India)

Introduction

When assessing compliance with CEA Technical Standards for Grid Connectivity by renewable energy (RE) generators, it's crucial to evaluate at the Point of Interconnection (POI), which denotes the specific connection point of the RE generating station to the grid. In this assessment, the generator pooling station, dedicated transmission line, and RE system should all be considered integral components. To ensure adherence to grid codes and standards per CEA guidelines, the following assessment tests are imperative. These tests involve the utilization of PSSE, PSCAD software.

?Modeling and System Studies using PSCAD-PSSE as per CEA Regulations on Technical Standards for Grid Connectivity, 2022

This involves the development and validation of PSSE & PSCAD models in alignment with CEA regulations on Grid Connectivity Standards, as detailed in the Final Report of the Working Group (July 2022).

Steady-State Studies

Reactive Power Capability: Assessing reactive power capability at various POI voltage levels and additional reactive compensation sizing, if necessary. Q-V curve plotting utilizing detailed model results.

Short-Circuit Analysis

Determining NCSFC fault current contribution for 3-phase and 1-phase faults at POI using PSSE equivalent model.?

Dynamic-State Studies

Validating dynamic models using equivalent PSCAD and PSSE models and comparing responses.

Voltage Ride Through Test

Demonstrating ride-through capability for balanced and unbalanced faults (LVRT & HVRT).

Frequency Response and Operational Capability Test

Assessing frequency response and operational capability within specified frequency ranges.

?Active Power Control Set Point

Analyzing the capability to control active power injection according to a set point.

Ramping Capability Test

Analyzing the rate of change of power output.

Power Quality Studies

Conducting harmonic analysis, DC injection analysis, and voltage flicker assessment at POI.

Conclusion

Compliance with CEA guidelines for Grid Code is essential for ensuring the seamless integration of renewable energy projects into the grid. Thorough studies and tests, utilizing advanced simulation software, are necessary to meet these standards effectively.