SGS recently conducted an extensive pre-commissioning testing campaign for a cutting-edge single axis tracking solar PV utility plant in Pakistan showcasing its expertise and capabilities in the renewable energy sector. Our scope of engagement with the client was centered on testing two of the three 50 MWp blocks of the cumulative 150 MWp PV plant capacity.
This case study focuses on the key tests performed, the identification of faults, and how the meticulous on-site rectification efforts contributed to our client obtaining a No Objection Certificate (NOC) from the Central Power Purchasing Agency (CPPA-G), allowing the seamless integration of the plant into the utility grid.
SGS Testing Process:
IV Testing and String Polarity Analysis:
- Rigorous IV testing on around 3000 strings to assess their current-voltage characteristics
- String polarity analysis ensured proper wiring configurations, identifying and rectifying any reverse polarity issues that could impact system efficiency
We utilized our state-of-the-art Seaward Solar PV testing kit for precise and comprehensive testing. The testing kit ensured accuracy and efficiency in the evaluation of 3000 strings, which represents a 50% sample of the two 50 MWp blocks.
Findings and Solutions:
Tracker Malfunctions:
- We identified and promptly rectified tracker malfunctions to ensure optimal solar panel alignment with the sun. This improved tracking accuracy and contributed to enhanced energy capture and overall system efficiency
String Mismatch:
- Our team rectified string mismatch issues through reconfiguration of string lengths as per the array layout plan, ensuring uniform power production across the entire system
Reverse Polarity:
- We corrected instances of reverse polarity, mitigating safety risks and optimizing the electrical performance of the solar PV system
Added Value by SGS:
On-Site Rectification Impact:
- The swift and efficient rectification of identified faults on-site significantly contributed to the plant's reliability
- Demonstrated commitment to quality and compliance with industry standards, instilling confidence in the CPPA-G (single buyer of generating units in Pakistan’s centralized electricity market)
NOC Approval:
- The successful rectification efforts played a pivotal role in obtaining the No Objection Certificate from the CPPA-G
- The NOC validated the solar plant's compliance with regulatory requirements, ensuring its seamless integration into the utility grid
Selling Units to Utility Grid:
- With the NOC in hand, our client was able to start selling generated units to the utility grid, contributing to the region's renewable energy goals
- The solar utility plant became a reliable source of clean energy, delivering sustainable power to the community
This case study exemplifies SGS’s commitment to excellence in solar energy solutions. By leveraging advanced testing technologies, identifying and rectifying 70 faults, and facilitating the client's journey from pre-commissioning testing to obtaining regulatory approval and selling units to the utility grid, we have demonstrated our expertise and dedication to delivering reliable and efficient solar solutions.
SGS’s meticulous approach not only ensures the success of individual projects but also contributes to the broader adoption of sustainable energy practices.
About SGS
We are SGS – the world's leading testing, inspection and certification company. We are recognized as the global benchmark for sustainability, quality and integrity. Our 99,600 employees operate a network of 2,600 offices and laboratories, working together to enable a better, safer and more interconnected world.
Nanduz Restaurant Building, 4th floor No:17,
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Basra, Iraq