5 research outputs found
Photovoltaic grid-forming control strategy investigation using hardware-in-the-loop experiments
The frequency stability of a power system is of paramount importance, as a
fast frequency swings in the system can lead to oscillatory instability, and
thereby blackouts. A grid-connected microgrid, that can operate in the islanded
mode can also possess such deteriorating effect due to the higher share of
converter-based sources. In this paper, a coordinated frequency control within
a distribution network is discussed, with a higher share of Photovoltaics (PV).
The main objective of this paper is to test the grid-forming capabilities of
PVs, without the requirement of an energy storage in the network. The tests
were carried out with the help of the Typhoon Hardware-in-the-loop (HIL)
platform using a real Cypriot network feeder. The real-time results confirm the
efficacy of the PV as a grid-forming inverter, provided it has sufficient input
(irradiance) to provide for the loads within the system of interest. The
grid-forming PV also possesses the capability of reconnection with the utility
grid through a synchronizer switch that requires minimal communication, makes
the overall control independent of any other power source, subject to certain
irradiance and loading conditions.Comment: 13th Mediterranean Conference on Power Generation, Transmission,
Distribution and Energy Conversion (MEDPOWER 2022
Stability Studies for Photovoltaic Integration using Power Hardware-in-the-Loop Experiments
The electrical power network is gradually migrating from a centralized
generation approach to a decentralized generation with high shares of renewable
energy sources (RES). However, power systems with low shares of synchronous
generation and consequently low total system inertia, are vulnerable to power
imbalances. Such systems can experience frequency stability problems, such as
high frequency excursions and higher rates of change of frequency even under
small disturbances. This phenomenon is intensified when the grid under
investigation has low or no interconnections (islanded) and thus the challenge
for stable operation becomes more significant for the operators. This work
focuses on how the frequency stability is affected when a photovoltaic (PV)
inverter is integrated into a real non-interconnected distribution grid in
Cyprus. In order to capture the realistic interactions of this integration,
stability experiments in a hardware-in-the-loop (HIL) environment are performed
with the aim to provide insightful results for the grid operator.Comment: The 12th Mediterranean Conference on Power Generation, Transmission,
Distribution and Energy Conversion (MEDPOWER 2020
Enabling Conditions for the Deployment of Integrated Local Energy Communities in Europe
The main goal of eNeuron H2020 project (Nov 2020-Oct. 2024, ID: 957779) is to develop innovative tools for the optimal design and operation of local energy communities, integrating distributed energy resources and multiple energy carriers at different scales. This paper presents a review study of the enabling conditions for the deployment of integrated local energy communities (ILECs) in Europe, performed within the project. The enabling conditions are addressed by defining the key actors and their interests in the implementation of an energy community at local level and through a detailed mapping of the enabling and emerging energy and information and communication technologies at both household and community levels. Special focus is also on mapping of the demand-side flexibility technologies to understand the benefits of local flexibility and impacts on the larger systems. In such analysis, the key issues for implementation and adaptation of this new energy paradigm are investigated through covering technological, socio-economic, environmental, and regulatory aspects
A Comprehensive Review of the Design and Operation Optimization of Energy Hubs and Their Interaction with the Markets and External Networks
The European Union’s vision for energy transition not only foresees decarbonization of the electricity sector, but also requires commitment across different sectors such as gas, heating, and cooling through an integrated approach. It also sets local energy communities at the center of the energy transition as a bottom-up approach to achieve these ambitious decarbonization goals. The energy hub is seen as a promising conceptual model to foster the optimization of multi-carrier energy systems and cross-sectoral interaction. Especially in the context of local energy communities, the energy hub concept can enable the optimal design, management, and control of future integrated and digitalized networks where multiple energy carriers operate seamlessly and in complementarity with each other. In that sense, the optimal design and operation of energy hubs are of critical importance, especially under the effect of multiple objectives taking on board not only technical, but also other aspects that would enable the sustainability of local energy communities, such as economic and environmental. This paper aims to provide an in-depth review of the literature surrounding the existing state-of-the-art approaches that are related to the design and operation optimization of energy hubs by also exploring their interaction with the external network and multiple markets. As the planning and operation of an energy hub is a multifaceted research topic, this paper covers issues such as the different optimization methods, optimization problems formulation including objective functions and constraints, and the hubs’ optimal market participation, including flexibility mechanisms. By systematizing the existing literature, this paper highlights any limitations of the approaches so far and identifies the need for further research and enhancement of the existing approaches
Particulate monitoring, modeling, and management: natural sources, long-range transport, and emission control options: a case study of Cyprus
The LIFE+ Project PM3: Particulate Monitoring, Modeling, Management is coordinated by the Department of Labour Inspection in Cyprus and funded in part by LIFE+ Environment Policy & Governance. The project aims at the analysis of dust emissions, transport, and control options for Cyprus, as well as at the identification of “natural” contributions (Directive 2008/50/EC). The ultimate objective is to provide inputs for the design of a dust management plan to improve compliance to EC Directives and minimise impacts to human health and environment. This paper presents a short analysis of historical monitoring data and their patterns as well as a description of a dynamic dust entrainment model. The pyrogenic PM10 emissions combined with the wind driven emissions, are subject to a two phase non-linear multi-criteria emission control optimization procedure. The resulting emission scenarios with an hourly resolution provide input to the Comprehensive Air quality Model with extensions (CAMx) 3D fate and transport model, implemented for the 4,800 km master domain and embedded subdomains (270 km around the island of Cyprus and embedded smaller city domains of up to 30 km down to street canyon modeling). The models test the feasibility of candidate emission control solutions over a range of weather conditions. Model generated patterns of local emissions and long-range transport are discussed compared with the monitoring data, remote sensing (MODIS derived AOT), and the chemical analysis of dust samples