Systems of accurate forecasting of RES generation, a well-developed ancillary services market and interconnectors are the main tools allowing a safe and effective integration of the rapidly growing RES capacity into the grid.
These were among the key topics discussed at the Steering Committee meeting of the joint project “System Transformation for an optimized integration of renewable energies in Ukraine” by NPC Ukrenergo, Elia Grid International (EGI) and German Energy Agency (dena). The project aims to analyse technical and regulatory challenges associated with the RES integration and develop recommendations on how to solve them.
As pointed out by European colleagues, a key tool for dispatching and managing power system regimes with a large share of RES is first of all a developed ancillary services market. In Ukraine so far, this market segment is not operational. The procedure for inspection and testing of equipment for certification of participants in the ancillary services market was approved by the NEURC only 9 days before the launch of the new market – on June 21, 2019. (Resolution No. 1120 “On Approval of Amendments to the Transmission Network Code”). It should be noted that it takes at least 3 months to complete the verification of a market participant. So far, four generating companies have started inspections and testing of equipment to participate in the ancillary services market – PrJSC Ukrhydroenergo, PJSC Tsentrenergo, Kharkivska CHP-5 and DTEK Skhidenergo. The ancillary services market is expected to become operational by the end of 2019.
Effective balancing of the grid is also helped by mid-term (two-day) and short-term (within 24 h) forecasting of RES production, as well as the availability of highly flexible generation. Accurate forecasting allows to make precise calculation of the required reserves, while highly flexible generation helps compensate the non-guaranteed RES capacity and avoid system imbalance.
Our power system can accept 4 750 MW of RES power without negative consequences for the grid stability, the research suggests. This figure, however, will go down to 3 965 MW by the year end. Further increase in the share of RES generation without urgent legislative regulation of their activities within the energy market and control over construction of new assets creates risks of imbalance in the system. First and foremost, the problem lies in the green generation’s virtual impunity with regard to imbalances, which, in turn, does not stimulate producers to prepare accurate generation forecasts. The attendees noted that currently Ukraine offers very little incentive to invest in the construction of high-flexibility generation. According to EGI representatives, such incentives appear as a combination of market signals, TSO’s regular reporting on generation compliance and adequacy, providing the basis for developing justified proposals for network development and energy policy. Strategic state policy is also important in this regard, today being the objectives of the EU’s Fourth Energy Package.
German colleagues also noted that a well-developed network of interconnectors with neighbouring countries allows to balance RES in the grid.
The meeting also presented a plan of further project activities. The programme provides for discussion and analysis of issues in 4 strategic areas:
- national strategy, external and internal communications;
- improved function of the balancing market and enhancing network capability;
- green auctions
- support of investments in grid development, RES, innovations.
Each area involves a series of focus meetings and discussions, analysis to provide recommendations to be used when formulating key documents for network development – a report on the compliance and adequacy of power generation capacity and a 10-year network development plan.
The project “System Transformation for an optimized integration of renewable energies in Ukraine”, funded by a grant from the Federal Ministry of Economy and Energy of Germany, started in July 2019 and will continue until March 2020.