Providing system-level services via battery storage

On the 10th of Oktober, 2019, the IEEE BUTE Jt IAS/PES SBC organised the second lecture of the Stoczek József memorial semester. During the event, the participants could hear from two different projects implemented in this year. One of them is Ádám Theisz, managing director of ELMŰ-ÉMÁSZ Energiatároló Kft., The other is Péter Luczay, managing director of ALTEO Wholesale and Regulatory Center.

Ádám Theisz (ELMŰ-ÉMÁSZ):

In recent years, solutions for generating electricity from renewable energy sources, such as solar and wind energy, have been gaining in importance, while conventional rotary power plants are losing importance. The inertia and fexibility of interconnected power systems decreases as their mass decreases, making them increasingly susceptible to various disturbances such as changes in the production balance. This process drew attention to the importance of so-called systemic reserves. In order to ensure these, ELMŰ-ÉMÁSZ Energiatároló Kft. Has established the first battery accumulator in Hungary, next to the Soroksár substation.

The primary function of storage-based primary controllers differs from rotary machinery in that it seeks to correct frequency differences not by decreasing or increasing production, but by changing the charge level of the batteries. If there is excess power in the power system, the controller stores, that is, charges the batteries and discharges them in the event of a power failure. All this is done in a fully automated manner, without the need for operator staff, with the help of a remote monitoring system.

ELMŰ-ÉMÁSZ Soroksár energy storage has been successfully launched at the MAVIR regulatory auction and it was actively involved in maintaining the domestic electricity system balance from 15 November 2018. Based on the experience to date, a 30% share of the primary regulatory reserve market can be achieved. The market reacted to the newly created device, and after its construction, primary regulation prices broke down.

Péter Luczay (ALTEO):

ALTEO has won an almost $ 500 million R&D grant to upgrade its battery storage, making it a more rational decision for them. The primary objective was not to make a huge profit, but  to get to know the technology. ALTEO is a pioneer in energy storage, which until now had to obtain all the relevant information from external sources that were difficult or even uncontrollable. But now they have a tool to gain a lot of experience.

This is the first MW class electricity storage in Hungary, with a total installed power of 7.5 megawatts. It currently has 6 megawatts of primary regulatory accreditation, and primarily provides such a regulatory reserve for the domestic power system. The balance between electricity production and consumption must be constantly ensured. This is not an easy task, as the consumer switches their electrical appliance on and off whenever they want, while producers usually implement a specific production plan. If the actual value of the mains frequency exceeds the reference value of 50, it means that more electricity is fed into the system than the exception, that is, production must be curtailed (down regulation), but if it is below the reference value, less electricity is produced, as it is consuming so, it is necessary to increase energy production (regulation). This can change very quickly, even in seconds, and the Li-ion battery pack that is capable of tracking these movements very quickly makes up for it. The past period was characterized by stable operation, with only minor operational anomalies – typically software problems – that were quickly resolved.