Why Demand response (DR) is known as virtual storage?

Demand response (DR) an enabling technology shifts the magnitude and timing of electricity demand, thus provides system flexibility, reduces system-wide costs and facilitates higher penetrations of renewable on the grid. By providing various incentives, SO(system operator) ensures that residential, commercial and industrial consumers change their electricity consumption patterns or allow SO to control a portion of their flexible load.
SO can achieve DR by price-based or incentive-based mechanism or by controlling the consumer’s load.
Price-based(real-time pricing)\r\nBy using an advanced energy management system, participating consumers receive price signals from the SO and reduce their load in the future for a financial incentive. In price-based DR( decentralised demand control)consumers have control over their own loads and shift consumption from most expensive periods of peak demand to less expensive periods of low demand thus reduces communication costs and latency. The value of DR depends on the magnitude, timing, and duration of the aggregated response.\r\nIncentive-based schemes.
In incentive-based schemes (e.g. interruptible or curtailable load) system operator provides a financial incentive to the consumer and directly controls consumer’s flexible load(domestic freezers/ wet appliances/ industrial heating loads) and reduce or disconnect load in response to an unplanned outage of a large power plant. By monitoring and adjusting consumer demand system operator balance the system’s supply and demand. Centralised control of the flexible demand can be achieved by establishing communications between the flexible demand and its Distributed Network Operator(DNO).
What is energy storage?
Energy storage, an enabling technology shifts the magnitude and timing of electricity supply by storing excess electricity during low demand and releasing it during high demand thus provide reliability and flexibility to the grid.Depending on the specific application various technologies such as pumped hydro, batteries, thermal energy, and Flywheel energy storage provide operating reserves such as frequency regulation, spinning reserves, and contingency reserves.
By releasing energy during peak demand, energy storage technology provides energy services. Similarly, both centralised and decentralised control of demand(load)resources provide energy services, thus reducing the reliance on expensive generators to meet peak demand.
Similarly to energy storage technology, DR technology provides operating reserves to correct short-term system imbalances emerge between supply and demand due to unplanned generator outages or uncertainty in forecasts for load and variable renewable electricity generation. Obviating the need to procure expensive spinning reserves from conventional generators. DR saves the cost.
Akin to energy storage technology, DR technology obviates the need for additional investment in peaking capacity of conventional energy resources and meet reliability standards and offer the capacity value to the grid.
The emergence of the smart grid technology, smart metering, smart appliances, advance forecasting for renewable, advanced energy storage, artificial intelligence along with active participation of consumers has made Demand response management technical feasible and cost-effective. By employing the relevant sensors at a load level and using AI and ML, load demand can be predicted and electricity can be diverted to the priority loads.
As Demand Response (DR) plays the role of conventional Energy Storage Systems (ESSs), Demand Response (DR) is also known as virtual energy storage.

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