Wind, Solar And Hydro Projects Should Be Treated As 'Must Run', Suggests Expert Panel

A panel reviewing the Indian Electricity Grid Code (IEGC) 2020, suggests that wind, solar, wind-solar hybrid, and hydro projects must be treated as ‘must-run’ power projects

January 21, 2020. By Darshana Daga

A panel reviewing the Indian Electricity Grid Code (IEGC) 2020, suggests that wind, solar, wind-solar hybrid, and hydro projects must be treated as ‘must-run’ power projects

The draft report also suggests that such projects should not be subjected to curtailment on account of merit order dispatch or any other commercial consideration.

The draft states that, “In the event of constraints in the transmission system, the renewable generation may be curtailed if it is the only source which relieves the constraint. Curtailment could also be required in case all the flexible resources are harnessed by the appropriate load dispatch center (LDC), but frequency remains above 50.05 Hz, the Area Control Error (ACE) remains high and any further reduction in conventional generation would necessitate de-commitment of units leading to shortage conditions and possible load shedding during the peak hours,”.

In May 2019, the Central Electricity Regulatory Commission (CERC) constituted an expert group to review the provisions of CERC’s Indian Electricity Grid Code Regulations 2010.  According to the expert panel headed by former Central Electricity Authority (CEA) chairman Rakesh Nath, during an interactive session with the stakeholders, it was pointed out that the cost of forecasting infrastructure and error in forecasting could be reduced by doing a forecast over a large geographical area—a practice followed in Europe.

The draft report also mentions that the existing scheduling and dispatch code has been reviewed thoroughly and redrafted with new features such as real-time market, combined scheduling for qualified coordinating agencies (QCA), and security-constrained unit commitment.

Each QCA, representing the renewable generator, could have a coordination center within the region in which it is located for round the clock operational coordination.  Provided that where the renewable generator does not appoint a QCA, the respective generating station may undertake operational coordination.

The experts have suggested that those wind, solar, and hybrid projects that are commissioned after March 31, 2022, could have the option to provide primary response individually through battery energy storage system (BESS) or through a common BESS installed at its pooling station.

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