IEA PVPS: distributed solar and storage can ‘contribute very well’ to grid flexibility. ‘Short response times’ for solar and storage. The report uses the example of the EU’s existing balancing mechanism to demonstrate the potential for distributed solar to help provide balancing services more effectively. At present, if there is a sudden change in the demand for a power grid, operators move through five stages of grid balancing, from a “self-regulation effect” and the use of a reserve supply of power, through to the use of a tertiary control reserve to use additional power stations to meet changes in demand. The report uses a number of examples of energy grids from around the world to demonstrate the efficacy of distributed solar in overcoming these delays, with one example taken from Italy. In this case study, the grid is supported by an 800kW PV plant, paired with a 2.4MWh BESS, and the combination of these technologies helps the grid meet energy demand without burdening any one source of power.
For instance, over a 24-hour period, the grid’s energy output is met predominantly by the storage facilities, between the hours of midnight and 8am; and distributed PV, between the hours of 10am and 3pm, as shown in the graph below. This conforms to the understanding that PV plants are at their most productive during the middle of the day, and it is notable that the total energy load of the power grid does not vary considerably over the 24-hour period. Instead of thermal power plants and their rotating mass, advanced inverters in solar PV and battery storage systems can provide this inertia, although to date has been seen in limited quantities and from large-scale assets.
However, the report notes that transmission system operators (TSOs) are looking to reduce the amount of inertia in their energy systems, and that system stability studies suggest that the time periods with lower levels of inertia have been “strongly increasing”, a phenomenon which will make a grid more reliable, but could remove a component of electricity generation.
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