By 2023, due to intensive implementation of RES in the power system of Ukraine, there should be 2 GW of highly flexible, fast-start capacity, and up to 1 GW for maintaining and adjusting frequency on the basis of electricity storage. This is one of the conclusions of the Report on Conformity Assessment (Sufficiency) of Generating Capacities, which was discussed today at NPC Ukrenergo with the participation of representatives of the Ministry of Energy and Environmental Protection, the Regulator, generation, sectoral associations and experts.
The introduction of the abovementioned capacities will minimize the likelihood of operational security violations in the event of significant fluctuations in RES capacity, and reduce the need for continuous use of conventional generation to compensate these fluctuations.
Due to the intense increase in RES capacity, the power system is already experiencing a shortage of flexible capacity. The decrease in balancing capabilities is due to the high primary power of NPPs, TPPs, CHPs, and in the flood period of HPPs, an increase in the share of RES that not only lack regulation but also pose new challenges for it.
In market conditions, ancillary service market is also a balancing tool, a full launch of which is indispensable. In this regard, it is necessary to reconstruct conventional power generation facilities. Successful testing and further certification of which will allow them to participate fully in the ancillary service market. Participation in the ancillary service market of nuclear- and hydrogeneration will allow optimising the operation of NPPs (their unloading or suspension at surplus generation with corresponding payment of lost NPP economic benefits). But for this, it is necessary to improve the regulatory framework.
“Today, RES have a low production forecasting accuracy. Significant fluctuations in RES generation require reserves in addition to balancing capacity, which are primarily intended to compensate for disturbances in the grid, and not for balancing. This, in turn, is already creating reserve shortages”, said Director of Management of the IPS of Ukraine, Chief Dispatcher of NPC Ukrenergo Vitaliy Zaichenko.
According to the draft report, in 2021, the maximum capacity deficit of unloading reserves is projected at 486MW for 1825 hours/year, for loading – 702 MW for 4198 hours/year.
The construction of energy storage systems or the development of demand management systems will help to eliminate the shortage of reserves and improve balancing in the power system. An alternative to these two solutions may be the introduction of new highly flexible balancing capacities with a broad adjustable range and fast launch.
According to the results of the draft report, the generation capacity for 2026-2030 may be sufficient only in case of introduction of high-speed reserves. In doing so, it is possible to compensate for the shortage of generation and reserve capacities with import from continental Europe.