While economic, environmental and energy security concerns have been the key influencers for promotion and development of Renewable Energy sources, these sources are characterized by inherent issues like variability, intermittency and fast ramping, etc. Various countries have been facing concerns with respect to these issues with the increasing proportion of renewable energy sources in the grid. The variability on account of generation from RE sources impose a threat on effective management of the system operation and management.
The growing proportion of renewable energy (especially wind and solar) in the power system further adds to these challenges. Energy storage is the key component for creating sustainable energy systems. Current technologies, such as solar photovoltaic and wind turbines etc. can generate energy in a sustainable and environmentally friendly manner, yet their intermittent nature poses issues in power quality, dependability and grid stability.
The need to effectively integrate such large scale Renewable Energy in the Grid has been one of the key concern for all stakeholders including the policy makers, planners and regulators. Technical requirements have been identified that are important at all levels for integrating large quantities of RE generation in the Indian grid.Firstly a robust transmission services to ensure that RE generation backing down is minimal with adherence to Grid Standards and Regulations by RE generators. Second factor is Load forecasting at DISCOM, SLDC, RLDC and NLDC levels and RE generation forecasting at poolling station, groups of Pooling Stations, SLDCs, RLDCs and NLDC levels. Finally there is a need for primary, secondary and tertiary generation reserves Ancillary Services framework at inter-state and intra state level to operationalize the reserves.
Hence, reliable operation of the synchronous all India Grid in the envisaged RE-rich scenario calls for availability of adequate reserves & flexibility services in the form of conventional storage system like pumped storage hydro plants and non-conventional energy storage system.
Energy storage can play a significant role in meeting challenges of intermittency by improving the operating capabilities of the grid, lowering power purchase cost and ensuring high reliability by maintaining unscheduled interchange as well as deferring and reducing infrastructure investments in new projects. The Energy Storage System (ESS) has a wide range of applications which can be deployed from consumer level, connected to distribution system, to bulk storage system connected to the grid.
Moreover, I feel that a faster move towards an energy storage market will also help in reducing the need for major augmentation of new transmission infrastructure and balancing reserves. This will be particularly useful for us the Renewable Energy developers as we will have the flexibility to store electricity generated during the day time and use the same power to supply electricity during time of no wind or solar.
SANJITH S. SHETTY