Provision Ancillary Grid Services

By C. S. Demoulias, K.-N. D. Malamaki, G. C. Kryonidis, M. Cvetkovic, U. Mushtaq, S. I. Gkavanoudis, K. O. Oureilidis, J. M. Mauricio, and E. O. Kontis

The increasing penetration of Distributed Renewable Energy Sources (DRES) has brought into focus a series of technical problems that jeopardize the stable and reliable operation of electrical power systems. EASY-RES is an EU Horizon 2020 research project aiming to the improvement of the energy security by making DRES provide a number of significant new Ancillary Services (AS) allowing, thus, high DRES penetration -up to 100%- in the grid with simultaneous decommission of large Synchronous Generators (SGs) driven by fossil-fuels.

By Robin Preece

The short answer is ‘Yes – for now’ but we must stay future-focussed and plan the next stage in power systems operation. Otherwise, we risk constraining new devices by forcing them to replicate the services of the synchronous machines we are used to and do not fully exploit the benefits and flexibility they offer.

By Claude Ziad El-Bayeh and Khaled Alzaareer

The power demand of the customers fluctuates unexpectedly both in real-time and over the course of hours, days and months. Furthermore, unexpected power outages may occur in the generation and transmission network and may lead to instability. Therefore, system operators need efficient tools to keep the system to operate in a stable and reliable manner in real-time and over several hours, days, months and years. There is a necessity for the system operators to have flexible and fast responsive technology and equipment to meet the challenges of intermittent resources such as solar irradiance and wind speed. On the other hand, there is a need to meet the fluctuating load demand for electricity customers. Therefore, the integration of Renewable Energy Sources (RES) creates new challenges to the system operator in which the grid stability and reliability are threatened. Despite the disadvantages of integrating RES into the power systems, they play a central role in providing ancillary services by supporting the grid and meet the demand of the electricity customers. Hence, advanced technologies and control techniques are required to reduce the fluctuation and provide ancillary services to the grid such as voltage, frequency, and power control.

By S. Ali Pourmousavi, Giulia De Zotti, Juan M. Morales, and Henrik Madsen

Due to the increasing share of intermittent energy resources in the generation portfolio, conventional power plants with synchronous generators are forced to retire because of low energy prices and strict environmental policies. These resources are the main sources of regulation services in the network, such as inertia, primary and secondary frequency regulation. The increase in renewable generation coinciding with the retirement of conventional generators, raises concerns over the Ancillary Services (AS) provision in the future, as one of the main challenges in a grid with a large renewable penetration. Therefore, it is necessary to seek out cheaper and readily available flexibility resources for the system operation. Traditionally, AS used to be required only by the Transmission System Operator (TSO) at the high-voltage level. However, large penetration of rooftop solar PV in low-voltage networks is causing unprecedented issues for Distribution System Operators (DSOs), e.g., overvoltage, reverse power flows, and congestion. As a result, a comprehensive AS mechanism is needed to enhance TSOs and DSOs operation at different voltage levels so that the new dynamics and uncertainties can be handled in a secure, reliable and cost-effective manner.

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