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In this paper, a modified Rao-2 (MRao-2) algorithm is proposed to solve the problem of optimal power flow (OPF) in a power system incorporating renewable energy sources (RES). Quasi-oppositional and Levy flight methods are used to improve the performance of the Rao algorithm. To demonstrate effectiveness of the MRao-2 technique, it is tested on two standard test systems: an IEEE 30-bus system and an IEEE 118-bus system. The objective function of the OPF is the minimization of fuel cost in five scenarios. The IEEE 30-bus system reflects fuel cost minimization in three scenarios (without RES, with RES, and with RES under contingency state), while the IEEE 118-bus system reflects fuel cost minimization in two scenarios (without RES and with RES). The achieved results of various scenarios using the suggested MRao-2 technique are compared with those obtained using five recent techniques: Atom Search Optimization (ASO), Turbulent Flow of Water-based Optimization (TFWO), Marine Predators Algorithm (MPA), Rao-1, Rao-3 algorithms, as well as the conventional Rao-2 algorithm. Those comparisons confirm the superiority of the MRao-2 technique over those other algorithms in solving the OPF problem.
Mohamed Hassan; Salah Kamel; Ali Selim; Tahir Khurshaid; José Domínguez-García. A Modified Rao-2 Algorithm for Optimal Power Flow Incorporating Renewable Energy Sources. Mathematics 2021, 9, 1532 .
AMA StyleMohamed Hassan, Salah Kamel, Ali Selim, Tahir Khurshaid, José Domínguez-García. A Modified Rao-2 Algorithm for Optimal Power Flow Incorporating Renewable Energy Sources. Mathematics. 2021; 9 (13):1532.
Chicago/Turabian StyleMohamed Hassan; Salah Kamel; Ali Selim; Tahir Khurshaid; José Domínguez-García. 2021. "A Modified Rao-2 Algorithm for Optimal Power Flow Incorporating Renewable Energy Sources." Mathematics 9, no. 13: 1532.
The high-penetration of Distributed Energy Resources (DER) in low voltage distribution grids, mainly photovoltaics (PV), might lead to overvoltage in the point of common coupling, thus, limiting the entrance of renewable sources to fulfill the requirements from the network operator. Volt-var is a common control function for DER power converters that is used to enhance the stability and reliability of the voltage in the distribution system. In this study, a centralized algorithm provides local volt-var control parameters to each PV inverter, which are based on the electrical grid characteristics. Because accurate information of grid characteristics is typically not available, the parametrization of the electrical grid is done using a local power meter data and a voltage sensitivity matrix. The algorithm has different optimization modes that take into account the minimization of voltage deviation and line current. To validate the effectiveness of the algorithm and its deployment in a real infrastructure, the solution has been tested in an experimental setup with PV emulators under laboratory conditions. The volt-var control algorithm successfully adapted its parameters based on grid topology and PV inverter characteristics, achieving a voltage reduction of up to 25% of the allowed voltage deviation.
Toni Gubert; Alba Colet; Lluc Casals; Cristina Corchero; José Domínguez-García; Amelia Sotomayor; William Martin; Yves Stauffer; Pierre-Jean Alet. Adaptive Volt-Var Control Algorithm to Grid Strength and PV Inverter Characteristics. Sustainability 2021, 13, 4459 .
AMA StyleToni Gubert, Alba Colet, Lluc Casals, Cristina Corchero, José Domínguez-García, Amelia Sotomayor, William Martin, Yves Stauffer, Pierre-Jean Alet. Adaptive Volt-Var Control Algorithm to Grid Strength and PV Inverter Characteristics. Sustainability. 2021; 13 (8):4459.
Chicago/Turabian StyleToni Gubert; Alba Colet; Lluc Casals; Cristina Corchero; José Domínguez-García; Amelia Sotomayor; William Martin; Yves Stauffer; Pierre-Jean Alet. 2021. "Adaptive Volt-Var Control Algorithm to Grid Strength and PV Inverter Characteristics." Sustainability 13, no. 8: 4459.
The appropriate control and management of reactive power is of great relevance in the electrical reliability, stability, and security of power grids. This issue is considered in order to increase system efficiency and to maintain voltage under the acceptable value range. In this regard, novel technologies as FACTS, renewable energies, among others, are varying conventional grid behavior leading to unexpected limit capacity reaching due to large reactive power flow. Thus, optimal planning of this must be considered. This paper proposes a new application for a simple and easy implementation optimization algorithm, called Rao-3, to solve the constrained non-linear optimal reactive power dispatch problem. Moreover, the integration of solar and wind energy as the most applied technologies in electric power systems are exploited. Due to the continuous variation and the natural intermittence of wind speed and solar irradiance as well as load demand fluctuation, the uncertainties which have a global concern are investigated and considered in this paper. The proposed single-objective and multi-objective deterministic/stochastic optimal reactive power dispatch algorithms are validated using three standard test power systems, namely IEEE 30-bus, IEEE 57-bus, and IEEE 118-bus. The simulation results show that the proposed optimal reactive power dispatch algorithms are superior compared with two recent algorithms (Artificial electric field algorithm (AEFA) and artificial Jellyfish Search (JS) algorithm) and other optimization algorithms used for solving the same problem.
Mohamed H. Hassan; Salah Kamel; Mahmoud A. El-Dabah; Tahir Khurshaid; Jose Luis Dominguez-Garcia. Optimal Reactive Power Dispatch With Time-Varying Demand and Renewable Energy Uncertainty Using Rao-3 Algorithm. IEEE Access 2021, 9, 23264 -23283.
AMA StyleMohamed H. Hassan, Salah Kamel, Mahmoud A. El-Dabah, Tahir Khurshaid, Jose Luis Dominguez-Garcia. Optimal Reactive Power Dispatch With Time-Varying Demand and Renewable Energy Uncertainty Using Rao-3 Algorithm. IEEE Access. 2021; 9 ():23264-23283.
Chicago/Turabian StyleMohamed H. Hassan; Salah Kamel; Mahmoud A. El-Dabah; Tahir Khurshaid; Jose Luis Dominguez-Garcia. 2021. "Optimal Reactive Power Dispatch With Time-Varying Demand and Renewable Energy Uncertainty Using Rao-3 Algorithm." IEEE Access 9, no. : 23264-23283.
In photovoltaic (PV) systems, the reliability of the system components, especially the power converters, is a major concern in obtaining cost effective solutions. In order to guarantee service continuity in the case of failure of elements of the PV converter, in particular, semiconductor switching devices, a solution is to design power converter with fault-tolerance capability. This can be realized by aggregating hardware redundancy on an existing converter, providing the possibility of replacement of faulty elements. This paper evaluates the reliability of a fault-tolerant power electronics converter for PV multistring application. The considered fault-tolerant design includes a single redundant switching leg, which is used in order to reconfigure the structure in case of a switch failure either on DC-AC or DC-DC stages. This paper details the reliability estimation of the considered PV multistring fault-tolerant converter. Furthermore, a comparison with a conventional structure without fault-tolerant capability is provided. The results show that the introduction of a single redundant leg allows for improving the converter mean time to failure by a factor of almost two and it reduces, by half, the power loss due to system-failure shutdowns in PV applications, while only increasing the converter cost by 2–3%.
Hugues Renaudineau; Pol Paradell-Solà; Lluís Trilla; Alber Filba-Martinez; David Cardoner; José Luis Domínguez-García. Reliability Assessment of a Fault-Tolerant PV Multistring Inverter. Energies 2020, 13, 6525 .
AMA StyleHugues Renaudineau, Pol Paradell-Solà, Lluís Trilla, Alber Filba-Martinez, David Cardoner, José Luis Domínguez-García. Reliability Assessment of a Fault-Tolerant PV Multistring Inverter. Energies. 2020; 13 (24):6525.
Chicago/Turabian StyleHugues Renaudineau; Pol Paradell-Solà; Lluís Trilla; Alber Filba-Martinez; David Cardoner; José Luis Domínguez-García. 2020. "Reliability Assessment of a Fault-Tolerant PV Multistring Inverter." Energies 13, no. 24: 6525.
En el marco del Proyecto europeo RESCCUE, las proyecciones climáticas para la ciudad de Barcelona muestran aumentos significativos de las intensidades máximas de precipitación para el horizonte del 2071-2100. En este trabajo se presenta la evaluación de la resiliencia de los servicios urbanos de la ciudad frente a episodios de inundación para condiciones de lluvia actuales y futuras. El uso de modelos sectoriales e integrados ha permitido valorar la respuesta del sistema de drenaje de la ciudad tanto a nivel de sistema de alcantarillado subterráneo como a nivel superficial analizando el comportamiento hidráulico del conjunto de las superficies urbanas (calles, plazas, parques, etc.). Por otro lado, los parámetros asociados a las inundaciones superficiales (extensión de las zonas inundables, calado y velocidad) han sido empleados para estimar potenciales afectaciones futuras en otros servicios urbanos estratégicos como el tráfico superficial, el sistema eléctrico y el sistema de recogida de residuos.
B. Russo; M. Velasco; R. Monjo; E. Martínez-Gomariz; D. Sánchez; J. L. Domínguez; A. Gabàs; A. Gonzalez. Evaluación de la resiliencia de los servicios urbanos frente a episodios de inundación en Barcelona. El Proyecto RESCCUE. Ingeniería del agua 2020, 24, 101 -118.
AMA StyleB. Russo, M. Velasco, R. Monjo, E. Martínez-Gomariz, D. Sánchez, J. L. Domínguez, A. Gabàs, A. Gonzalez. Evaluación de la resiliencia de los servicios urbanos frente a episodios de inundación en Barcelona. El Proyecto RESCCUE. Ingeniería del agua. 2020; 24 (2):101-118.
Chicago/Turabian StyleB. Russo; M. Velasco; R. Monjo; E. Martínez-Gomariz; D. Sánchez; J. L. Domínguez; A. Gabàs; A. Gonzalez. 2020. "Evaluación de la resiliencia de los servicios urbanos frente a episodios de inundación en Barcelona. El Proyecto RESCCUE." Ingeniería del agua 24, no. 2: 101-118.
The large number of small scale Distributed Energy Resources (DER) such as Electric Vehicles (EVs), rooftop photovoltaic installations and Battery Energy Storage Systems (BESS), installed along distribution networks, poses several challenges related to power quality, efficiency, and reliability. Concurrently, the connection of DER may provide substantial flexibility to the operation of distribution grids and market players such as aggregators. This paper proposes an optimization framework for the energy management and scheduling of operation for Low Voltage (LV) networks assuring both admissible voltage magnitudes and minimized line congestion and voltage unbalances. The proposed tool allows the utilization and coordination of On-Load Tap Changer (OLTC) distribution transformers, BESS, and flexibilities provided by DER. The methodology is framed with a multi-objective three phase unbalanced multi-period AC Optimal Power Flow (MACOPF) solved as a nonlinear optimization problem. The performance of the resulting control scheme is validated on a LV distribution network through multiple case scenarios with high microgeneration and EV integration. The usefulness of the proposed scheme is additionally demonstrated by deriving the most efficient placement and sizing BESS solution based on yearly synthetic load and generation data-set. A techno-economical analysis is also conducted to identify optimal coordination among assets and DER for several objectives.
Konstantinos Kotsalos; Ismael Miranda; Jose Luis Dominguez-Garcia; Helder Leite; Nuno Silva; Nikos Hatziargyriou. Exploiting OLTC and BESS Operation Coordinated with Active Network Management in LV Networks. Sustainability 2020, 12, 3332 .
AMA StyleKonstantinos Kotsalos, Ismael Miranda, Jose Luis Dominguez-Garcia, Helder Leite, Nuno Silva, Nikos Hatziargyriou. Exploiting OLTC and BESS Operation Coordinated with Active Network Management in LV Networks. Sustainability. 2020; 12 (8):3332.
Chicago/Turabian StyleKonstantinos Kotsalos; Ismael Miranda; Jose Luis Dominguez-Garcia; Helder Leite; Nuno Silva; Nikos Hatziargyriou. 2020. "Exploiting OLTC and BESS Operation Coordinated with Active Network Management in LV Networks." Sustainability 12, no. 8: 3332.
Expanding populations and increased urbanisation are causing a strain on cities worldwide as they become more frequently and more severely affected by extreme weather conditions. Critical services and infrastructure are feeling increasing pressure to be maintained in a sustainable way under these combined stresses. Methods to better cope with these demanding factors are greatly needed now, and with the predicted impacts of climate change, further adaptation will become essential for the future. All cities comprise a complex of interdependent systems representing critical operations that cannot function properly independently, or be fully understood in isolation of one another. The consequences of localised flooding can become much more widespread due to the inter-relation of these connected systems. Due to reliance upon one another and this connectedness, an all-encompassing assessment is appropriate. Different model representations are available for different services and integrating these enables consideration of these cascading effects. In the case study city of Bristol, 1D and 2D hydraulic modelling predicting the location and severity of flooding has been used in conjunction with modelling of road traffic and energy supply by linking models established for these respective sectors. This enables identification of key vulnerabilities to prioritise resources and enhance city resilience against future sea-level rise and the more intense rainfall conditions anticipated.
John Stevens; Rob Henderson; James Webber; Barry Evans; Albert Chen; Slobodan Djordjević; Daniel Sánchez-Muñoz; José Domínguez-García. Interlinking Bristol Based Models to Build Resilience to Climate Change. Sustainability 2020, 12, 3233 .
AMA StyleJohn Stevens, Rob Henderson, James Webber, Barry Evans, Albert Chen, Slobodan Djordjević, Daniel Sánchez-Muñoz, José Domínguez-García. Interlinking Bristol Based Models to Build Resilience to Climate Change. Sustainability. 2020; 12 (8):3233.
Chicago/Turabian StyleJohn Stevens; Rob Henderson; James Webber; Barry Evans; Albert Chen; Slobodan Djordjević; Daniel Sánchez-Muñoz; José Domínguez-García. 2020. "Interlinking Bristol Based Models to Build Resilience to Climate Change." Sustainability 12, no. 8: 3233.
The current and future power systems foresee very deep penetration of renewable power plants into the generation mix, which will make the provision of ancillary services by renewables an ultimate necessity. This would be further emphasised when green power stations replace conventional power plants that rely on fossil fuels. In this context, many control methodologies could be applied to the controllers of the green generators to enable the provision of these services, mainly frequency support and voltage regulation. Most of the available models (i.e. in power system simulators) do not include such supplementary controls to provide ancillary services. Hence, this chapter exploits key examples of these controllers that proved to be efficient and widely accepted. In addition, this chapter considers their integration into the conventional controls of green generators, where the focus is on wind energy.
Ayman Attya; Jose Luis Dominguez-Garcia. Provision of Ancillary Services by Wind Power Generators. Advances in Modelling and Control of Wind and Hydrogenerators 2020, 1 .
AMA StyleAyman Attya, Jose Luis Dominguez-Garcia. Provision of Ancillary Services by Wind Power Generators. Advances in Modelling and Control of Wind and Hydrogenerators. 2020; ():1.
Chicago/Turabian StyleAyman Attya; Jose Luis Dominguez-Garcia. 2020. "Provision of Ancillary Services by Wind Power Generators." Advances in Modelling and Control of Wind and Hydrogenerators , no. : 1.
Despite attempts to increase the active power capability of vector-controlled voltage source converters (VSCs) connected to very weak grids, the interaction between the control dynamics and physical system is not completely understood. The result is often complex strategies that are difficult to implement. This paper proposes an intuitive modification of the VSC control based on physical considerations and dynamics of existing control. Several physical variables as seen from the point of common coupling (PCC) are found to contribute to the detrimental behavior of the VSC under weak connections. Hence, eliminating the impacts of these variables through feedforward eliminates their influence and significantly improves the active power capability. Notably, the basic structure of the vector controlled VSC is kept and its output-impedance is effectively reshaped. The proposed modification is validated through nonlinear time-domain simulations in MATLAB/Simulink Simscape Power System and results demonstrate the simplicity and intuitiveness of the modified structure.
Adedotun J. Agbemuko; Jose Luis Dominguez-Garcia; Oriol Gomis-Bellmunt; Lennart Harnefors. Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid. IEEE Transactions on Power Delivery 2020, 36, 156 -167.
AMA StyleAdedotun J. Agbemuko, Jose Luis Dominguez-Garcia, Oriol Gomis-Bellmunt, Lennart Harnefors. Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid. IEEE Transactions on Power Delivery. 2020; 36 (1):156-167.
Chicago/Turabian StyleAdedotun J. Agbemuko; Jose Luis Dominguez-Garcia; Oriol Gomis-Bellmunt; Lennart Harnefors. 2020. "Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid." IEEE Transactions on Power Delivery 36, no. 1: 156-167.
Climate change is increasing the frequency and intensity of extreme events and, consequently, flooding in urban and peri-urban areas. The electrical grid is exposed to an increase in fault probability because its infrastructure was designed considering historical frequencies of extreme events occurred in the past. In this respect, to ensure future energy plans and securing services is of great relevance to determine and evaluate the new zones that may be under risk and its relation to critical infrastructures for such extreme events. In this regard, the electrical distribution system is one of the key critical infrastructures since it feeds the others and with the future plans of zero-emissions (leading to the electrification of transport, buildings, renewable energies, etc.) will become even more important in the short term. In this paper, a novel methodology has been developed, able to analyze flood hazard maps quantifying the probability of failure risk of the electrical assets and their potential impacts using a probabilistic approach. Furthermore, a process to monetize the consequences of the yielded risk was established. The whole method developed was applied to the Barcelona and Bristol case study cities. In this way, two different examples of application have been undertaken by using slightly different inputs. Two main inputs were required: (1) the development of accurate GIS hazard flooding models; and (2) the location of the electrical assets (i.e., Distribution Centers (DCs)). To assess and monetize the flood risk to DCs, a variety of variables and tools were required such as water depths (i.e., flood maps), DCs’ areas of influence, fragility curves, and damage curves. The analysis was performed for different return periods under different scenarios, current (Baseline) and future (Business As Usual (BAU)) rainfall conditions. The number of DCs affected was quantified and classified into different categories of risk, where up to 363 were affected in Barcelona and 623 in Bristol. Their risk monetization resulted in maximums of 815,700 € in Barcelona and 643,500 € in Bristol. Finally, the percentage of risk increases when considering future rainfall conditions (i.e., BAU) when calculated, resulting in a 2.38% increase in Barcelona and 3.37% increase in Bristol, which in monetary terms would be an average of a 22% increase.
Daniel Sánchez-Muñoz; José L. Domínguez-García; Eduardo Martínez-Gomariz; Beniamino Russo; John Stevens; Miguel Pardo. Electrical Grid Risk Assessment Against Flooding in Barcelona and Bristol Cities. Sustainability 2020, 12, 1527 .
AMA StyleDaniel Sánchez-Muñoz, José L. Domínguez-García, Eduardo Martínez-Gomariz, Beniamino Russo, John Stevens, Miguel Pardo. Electrical Grid Risk Assessment Against Flooding in Barcelona and Bristol Cities. Sustainability. 2020; 12 (4):1527.
Chicago/Turabian StyleDaniel Sánchez-Muñoz; José L. Domínguez-García; Eduardo Martínez-Gomariz; Beniamino Russo; John Stevens; Miguel Pardo. 2020. "Electrical Grid Risk Assessment Against Flooding in Barcelona and Bristol Cities." Sustainability 12, no. 4: 1527.
Adedotun J. Agbemuko; Jose Luis Dominguez-Garcia; Eduardo Prieto-Araujo; Oriol Gomis-Bellmunt. Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids. IEEE Transactions on Power Delivery 2020, 35, 2459 -2470.
AMA StyleAdedotun J. Agbemuko, Jose Luis Dominguez-Garcia, Eduardo Prieto-Araujo, Oriol Gomis-Bellmunt. Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids. IEEE Transactions on Power Delivery. 2020; 35 (5):2459-2470.
Chicago/Turabian StyleAdedotun J. Agbemuko; Jose Luis Dominguez-Garcia; Eduardo Prieto-Araujo; Oriol Gomis-Bellmunt. 2020. "Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids." IEEE Transactions on Power Delivery 35, no. 5: 2459-2470.
Hybrid AC/DC grids are increasingly been seen as the most important network structure for future transmission infrastructures. An emerging challenge to such grids is the constant interaction between various components in the system. Interactions could occur in many intricate forms including between and within the AC and DC subnetworks. However, considering the complexities involved, methods for detection that are intuitive, compact, and relatively straightforward to apply are lacking. In this paper, device-level closed-loop impedance models of subsystems in a hybrid AC/DC grid are extended compactly to subnetwork equivalents in the form of matrices. Then, interaction analysis between a voltage source converter (VSC) interconnected on both sides, and a synchronous generator with excitation control is carried out as a case study to highlight potentially detrimental interactions. The analysis is carried out in the frequency domain and validated with a nonlinear time domain simulations in MATLAB/SIMULINK.
Adedotun J. Agbemuko; José Luis Domínguez-García; Oriol Gomis-Bellmunt. Impedance-Based Modelling of Hybrid AC/DC Grids With Synchronous Generator for Interaction Study and Dynamic Improvement. Electric Power Systems Research 2019, 179, 106086 .
AMA StyleAdedotun J. Agbemuko, José Luis Domínguez-García, Oriol Gomis-Bellmunt. Impedance-Based Modelling of Hybrid AC/DC Grids With Synchronous Generator for Interaction Study and Dynamic Improvement. Electric Power Systems Research. 2019; 179 ():106086.
Chicago/Turabian StyleAdedotun J. Agbemuko; José Luis Domínguez-García; Oriol Gomis-Bellmunt. 2019. "Impedance-Based Modelling of Hybrid AC/DC Grids With Synchronous Generator for Interaction Study and Dynamic Improvement." Electric Power Systems Research 179, no. : 106086.
The provision of frequency support by renewable power is a key challenge to allow higher penetration of renewables. While the research efforts focus on proposing new control methods and market structures to realize and facilitate the provision of frequency services by wind power, less attention is given to financial compensation of proper responses. This paper proposes a comprehensive method to evaluate the net payments to participating wind power plants, including a penalty factor for responses that do not comply with grid codes and market bids. This method integrates frequency data and dynamic response of wind power assets during the events, to evaluate the compliance level under a certain grid code, and calculates the corresponding net payment. The paper demonstrates the method by integrating the worst frequency event in each month from the real recorded data of UK National grid frequency response in 2016. The results obtained show clear diversities between the three examined support methods with clear influence of the incident wind speed. Kinetic energy extraction support method shows a little merit at high wind speeds, while pitch deloading method performs better at the majority of the examined case studies.
Ayman Bakry Taha Attya; Jose Luis Dominguez-Garcia. A Novel Method to Valorize Frequency Support Procurement by Wind Power Plants. IEEE Transactions on Sustainable Energy 2019, 11, 239 -249.
AMA StyleAyman Bakry Taha Attya, Jose Luis Dominguez-Garcia. A Novel Method to Valorize Frequency Support Procurement by Wind Power Plants. IEEE Transactions on Sustainable Energy. 2019; 11 (1):239-249.
Chicago/Turabian StyleAyman Bakry Taha Attya; Jose Luis Dominguez-Garcia. 2019. "A Novel Method to Valorize Frequency Support Procurement by Wind Power Plants." IEEE Transactions on Sustainable Energy 11, no. 1: 239-249.
An analysis of the impact of network and control in an interconnected system have been studied in this paper. Particularly, a simplified integrated approach is considered by modelling the entire network of devices and control in a multivariable feedback manner. In this way, the contribution of each device (via its impedance and/or control) and the network connection to responses observed can be understood in a tractable manner. The presented approach potentially provides a method that allows for manipulating observed responses via multivariable approaches. Results show the efficacy of the approach in providing a system perspective to dynamic responses by taking into account contributions. Analysis is carried out in frequency domain and validated with the physical model of the system built in SimscapeTM Power SystemsTM and control systems in MATLAB/Simulink®.
Adedotun J. Agbemuko; José Luis Domínguez-García; Oriol Gomis-Bellmunt. An Integrated Approach to Understanding the Impact of Network Resonances and Control on Dynamic Responses in VSC-HVdc Networks. IFAC-PapersOnLine 2018, 51, 344 -349.
AMA StyleAdedotun J. Agbemuko, José Luis Domínguez-García, Oriol Gomis-Bellmunt. An Integrated Approach to Understanding the Impact of Network Resonances and Control on Dynamic Responses in VSC-HVdc Networks. IFAC-PapersOnLine. 2018; 51 (28):344-349.
Chicago/Turabian StyleAdedotun J. Agbemuko; José Luis Domínguez-García; Oriol Gomis-Bellmunt. 2018. "An Integrated Approach to Understanding the Impact of Network Resonances and Control on Dynamic Responses in VSC-HVdc Networks." IFAC-PapersOnLine 51, no. 28: 344-349.
The requirement of system decarbonisation fixed by the EU 2050 plan is leading to an increased establishment of renewable energy sources. Additionally, the emergence of power electronics and ICT technologies has played a decisive role towards a novel distribution electric grid allowing new monitoring, operation and control. In parallel to the energetic transition, an increasing occurrence of extreme weather events and a reinforced concern on climate change leads to the concept of resilience, which is the capacity to adapt and recover from disruptive events in a coordinated procedure. After a fault event, assuming the objective of the system operator is to minimize the load unsupplied, the present study aims at outlining an early research state on the concept of self-healing through the development of a power flow optimization algorithm within a meshed network. Moreover, the effects of integrating Distributed Energy Resources (DER) in order to increase distribution grid resilience as well as to ensure and secure power supply to the system leads to the clusterization of the power system. With controllable technologies, the on-outaged areas are able to disconnect from the main grid, creating islanded microgrids (MGs) which can work autonomously and consequently, increase grid resilience.
Anna Palau-Mayo; Mikel De Prada; José Luís Domínguez-García. Towards more resilient electrical networks in urban areas. E3S Web of Conferences 2018, 61, 00015 .
AMA StyleAnna Palau-Mayo, Mikel De Prada, José Luís Domínguez-García. Towards more resilient electrical networks in urban areas. E3S Web of Conferences. 2018; 61 ():00015.
Chicago/Turabian StyleAnna Palau-Mayo; Mikel De Prada; José Luís Domínguez-García. 2018. "Towards more resilient electrical networks in urban areas." E3S Web of Conferences 61, no. : 00015.
Future power systems with high penetration of distributed energy resources (DER) and information and communication technology (ICT) will allow increasing the controllability and observability of the grid. However, new challenges for low voltage distribution networks has arisen where the increasing DER is mainly photovoltaic (PV) installed on the roofs of buildings. This type of generation is variable and generates disturbances in the network. Islands are ideal to experience and install new technologies since are weak grids and the penetration of PV will lead to bidirectional power flows at distribution level, thus a smart control will be required. This article aims to present and innovative tool for the distribution system operators (DSOs) to monitor and manage grid operation. In near future, both DER and client’s flexibility will increase. New monitoring and control tools for DSOs are essential. Furthermore, the grid operation optimization is needed to accommodate the expected DER installations and the active participation of consumers’ flexibility services in markets ensuring system efficiency. This tool is tested on “La Graciosa” grid, one of the Canary Islands, to show its benefit. The grid studied includes a hybrid energy storage system (HESS), PV generators, controllable/uncontrollable loads and equipment to monitor power flows.
Guillermo Domínguez-López; Pol Paradell-Solà; José Luis Domínguez-García; Jacob Rodríguez-Rivero; Jorge Sánchez Cifuentes. Demonstration of a microgrid manager in a distribution grid with high PV penetration and Storage: La Graciosa case study. E3S Web of Conferences 2018, 61, 00012 .
AMA StyleGuillermo Domínguez-López, Pol Paradell-Solà, José Luis Domínguez-García, Jacob Rodríguez-Rivero, Jorge Sánchez Cifuentes. Demonstration of a microgrid manager in a distribution grid with high PV penetration and Storage: La Graciosa case study. E3S Web of Conferences. 2018; 61 ():00012.
Chicago/Turabian StyleGuillermo Domínguez-López; Pol Paradell-Solà; José Luis Domínguez-García; Jacob Rodríguez-Rivero; Jorge Sánchez Cifuentes. 2018. "Demonstration of a microgrid manager in a distribution grid with high PV penetration and Storage: La Graciosa case study." E3S Web of Conferences 61, no. : 00012.
During the last years, the installation and planning of offshore wind farms using HVDC-links to transmit power onshore has increased. After the first HVDC connected offshore wind power plant of this type had been commissioned, the electrical harmonic resonance at the offshore AC grid was observed. The phenomenon leads to unwanted outages on both wind turbines and the HVDC transmission system. This paper aims to present the harmonic resonances in power-electronics dominated grids such as HVDC connected wind power plants. The study focuses on harmonic frequencies identification which are excited through the resonance phenomena between the elements of the offshore AC network including power converters. The paper presents a comparison of three different methodologies existing in the literature for harmonic resonance analysis including stability analysis. Moreover, we analyse the impact of the different power converter models application. The models and methods are validated in different test cases in order to determine the relationship of such resonances with respect to the grid topology.
Igor Sowa; José Luis Domínguez-García; Oriol Gomis-Bellmunt. Impedance-based analysis of harmonic resonances in HVDC connected offshore wind power plants. Electric Power Systems Research 2018, 166, 61 -72.
AMA StyleIgor Sowa, José Luis Domínguez-García, Oriol Gomis-Bellmunt. Impedance-based analysis of harmonic resonances in HVDC connected offshore wind power plants. Electric Power Systems Research. 2018; 166 ():61-72.
Chicago/Turabian StyleIgor Sowa; José Luis Domínguez-García; Oriol Gomis-Bellmunt. 2018. "Impedance-based analysis of harmonic resonances in HVDC connected offshore wind power plants." Electric Power Systems Research 166, no. : 61-72.
Expansion of offshore wind power and the use of high voltage direct current (HVdc) technologies in power transmission are modifying the power system dynamics making them more sensitive to power disturbances. Thus, in order to ensure a power system secure and stable operation, transmission system operators require wind power and HVdc systems to provide ancillary services such as frequency support. In this paper, a distributed control scheme is proposed to coordinate the contribution of wind power plants (WPPs) to mitigate frequency deviations in isolated ac synchronous areas connected through a multiterminal HVdc grid. The control scheme aims to share the power reserves with limited information exchange.
Fernando D. Bianchi; Jose Luis Dominguez-Garcia; Til Kristian Vrana. Distributed Frequency Control With Partial Information Using MT-HVDC Grids and WPPs. IEEE Systems Journal 2018, 13, 1694 -1701.
AMA StyleFernando D. Bianchi, Jose Luis Dominguez-Garcia, Til Kristian Vrana. Distributed Frequency Control With Partial Information Using MT-HVDC Grids and WPPs. IEEE Systems Journal. 2018; 13 (2):1694-1701.
Chicago/Turabian StyleFernando D. Bianchi; Jose Luis Dominguez-Garcia; Til Kristian Vrana. 2018. "Distributed Frequency Control With Partial Information Using MT-HVDC Grids and WPPs." IEEE Systems Journal 13, no. 2: 1694-1701.
DC grids and circuits based on power conversion from AC are expected to dominate future power systems. Despite such dominance, the DC grids are expected to be operated in connection with conventional AC systems, possibly with some synchronous generation within the grid. Challenges in modelling both networks simultaneously with considerable details is well established. This paper applies two known methodologies, the impedance modelling and Z-bus structure, to model both the AC and DC grids distinctly in the form of equivalent closed-loop impedance matrices. Each distinct matrix contains elements with individual dynamics of each grid and shared dynamics with the other grid(s). Frequency responses of theoretically derived impedances, show the contribution of each device or component, to resonances as seen from a specific terminal. In addition, frequency responses of the impedances on both sides of a converter (AC and DC) show possible interaction. The stability of the converter connected to a synchronous generator, via a long transmission line is investigated by applying Nyquist's stability plots.
Adedotun J. Agbemuko; Jose Luis Dominguez-Garcia; Oriol Gomis-Bellmunt. Impedance-based Modelling of a Hybrid AC/DC Grid with Z-bus Approach. 2018 IEEE Power & Energy Society General Meeting (PESGM) 2018, 1 -5.
AMA StyleAdedotun J. Agbemuko, Jose Luis Dominguez-Garcia, Oriol Gomis-Bellmunt. Impedance-based Modelling of a Hybrid AC/DC Grid with Z-bus Approach. 2018 IEEE Power & Energy Society General Meeting (PESGM). 2018; ():1-5.
Chicago/Turabian StyleAdedotun J. Agbemuko; Jose Luis Dominguez-Garcia; Oriol Gomis-Bellmunt. 2018. "Impedance-based Modelling of a Hybrid AC/DC Grid with Z-bus Approach." 2018 IEEE Power & Energy Society General Meeting (PESGM) , no. : 1-5.
Pervasiveness of power converters in the electric power system is expected in the future. Such large penetration will change the current power system dynamics leading to uncertain, unexpected, and potentially critical responses. This paper investigates the stability and resonance of a VSC-HVDC (Voltage Source Converter High Voltage Direct Current) link within an AC grid, whilst providing insights into resonances having a role on the grid. This is studied through the impedance-based modelling of the entire system (AC and DC grids), including controls of converters. Additionally, the impact of the different parameters of the hybrid AC-DC power system such as control systems and grid components on the system dynamics and stability is investigated. From this study, the impact of the system components and the controls of the converter on overall resonance response and stability is shown, including potential undesired sub-synchronous and harmonic resonances due to AC-DC system interactions. The analytical impedance-based models developed and obtained is validated through time-domain simulations, the physical model of the whole system is built in Simscape™ Power Systems™ and control systems in MATLAB/Simulink® (R2017b). This has demonstrated the validity of the model to deal with and detect such dynamics.
Adedotun J. Agbemuko; José Luis Domínguez-García; Eduardo Prieto-Araujo; Oriol Gomis-Bellmunt. Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions. Energies 2018, 11, 845 .
AMA StyleAdedotun J. Agbemuko, José Luis Domínguez-García, Eduardo Prieto-Araujo, Oriol Gomis-Bellmunt. Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions. Energies. 2018; 11 (4):845.
Chicago/Turabian StyleAdedotun J. Agbemuko; José Luis Domínguez-García; Eduardo Prieto-Araujo; Oriol Gomis-Bellmunt. 2018. "Impedance Modelling and Parametric Sensitivity of a VSC-HVDC System: New Insights on Resonances and Interactions." Energies 11, no. 4: 845.