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Exploiting multi-terminal High Voltage Direct Current (MTDC) grids for offshore wind park integration into continental bulk AC system raises several technical challenges, in particular the verification of the compliance of MTDC grids and offshore wind parks to the performance requirements (in terms of frequency, voltage support and fault ride through) which are being established by the grid codes,...
Accounting for the increasing uncertainties related to forecast of renewables is becoming an essential requirement while assessing the security of future power system scenarios. The FP7 EU project iTesla tackles these needs and reaches several major objectives, including the development of a security platform architecture. In particular, the platform implements a complex stochastic dependence model...
The increasing penetration of renewables and the constraints posed by pan-European market make more and more crucial the need to evaluate the dynamic behaviour of the whole grid and to cope with forecast uncertainties from operational planning to online environment. The FP7 EU project iTesla addresses these needs and encompasses several major objectives, including the definition of a platform architecture,...
Nowadays the management of interconnected transmission systems requires security assessment methods able to consider uncertainties due to the increasing presence of renewable generation. Furthermore, also the electrical demand is characterized by a certain level of variability which affects the accuracy of the expected consumption profiles. Thus, probabilistic approaches are an interesting research...
The secure integration of renewable generation into modern power systems requires an appropriate assessment of the security of the system in real-time. The uncertainty associated with renewable power makes it impossible to tackle this problem via a brute-force approach, i.e. it is not possible to run detailed online static or dynamic simulations for all possible security problems and realizations...
In transmission system planning, researchers propose methods to assess the effect of uncertainties of power system operating condition due to forecasting errors of intermittent generation and loads. In particular probabilistic power flow methods are used to calculate the probability distributions of the voltages and the branch currents, starting from the distributions of power injections/absorptions...
The need to analyze high-impact low-probability events on power systems, due to natural and man-related threats calls for comprehensive approaches to security assessment, which exploit the concept of risk. The paper describes a probabilistic approach and a tool, developed in the EU research project AFTER, aimed at selecting the most critical contingencies to be analyzed in depth, starting from short-term...
This paper considers a demand side response system for frequency control in agreement with suggestions proposed by the European Network of Transmission System Operators for Electricity (ENTSO-E). Such a control strategy is designed for supporting primary frequency regulation through thermostatically controlled loads, such as domestic refrigerators and water heaters. A realistic simulation study within...
In the context of transmission system planning, research proposes methods to assess the effect of uncertainties of power system operating condition due to forecasting errors of intermittent generation and loads. In particular probabilistic power flow methods are illustrated to calculate the probability distributions of the voltages and the branch currents, starting from the distributions of power...
This paper analyses the impact on the frequency regulation of a possible strategy of demand side management (DSM) within a realistic scenario of the Sardinian electric network, in a 2020 forecast horizon. The DSM method is designed for supporting primary and secondary frequency regulation through thermostatically controlled loads. The cases of domestic refrigerators and water heaters are considered...
Cascading stems from the interaction between control, protection, and defense systems, and it is affected by uncertainties in system models and external factors. An evaluation of cascading thus requires the collection of exhaustive and reliable data. Uncertainties could be accounted for by applying Monte Carlo techniques to time domain simulation, but a large computational effort would be implied...
Probabilistic techniques can provide a deeper insight into security analysis within operational planning and operation contexts, by quantitatively considering power system uncertainties and contingency impact. This paper proposes a methodology aimed to evaluate how uncertainties on a future power system operating condition affect operational risk indices. Major uncertainties in operational planning...
The exploitation of Renewable Energy Sources (RES) allows to reduce the electricity energy supplied by fossil fuelled power plants but introduces significant issues in power system planning and operation. Especially for small islanded systems, a larger share of load covered by RES, mainly wind and photovoltaic (PV) plants, implies lower inertia and reduced regulation resources to address frequency...
The deepening penetration of renewable resources, such as wind and photovoltaic solar, has introduced additional uncertainty into power system operation and control. This added uncertainty, together with the conventional sources of uncertainty, the loads and the availability of resources and transmission assets, makes clear the limitations of the conventional deterministic power flow in power system...
The integration of larger and larger amounts of wind power is a major target of the European Union, however it represents a challenge for power system planning and operation. The paper proposes an analytical method to perform probabilistic load flow on multi-terminal HVDC (MTDC) networks to integrate large amounts of power generated by remote offshore wind farms into the continental AC bulk power...
Power system security assessment for off-line operational planning and on line operation applications requires various analysis methods aimed to highlight different phenomena (steady-state violations, angle stability, voltage stability, etc.), overall providing an exhaustive vision of the problems. However, carrying out the different analyses in an integrated way is not an easy task. Different types...
In the context of power system operation, probabilistic techniques not only can provide a deeper insight into security aspects, by quantitatively considering power system uncertainties and contingency impact, but they can also be helpful to identify and suggest operators the most adequate control actions to reduce operational risk. This paper proposes an innovative risk-based strategy to control the...
Probabilistic Risk Assessment (PRA) techniques are raising more and more interest in the context of the operation of high voltage transmission networks because they represent a new approach to the security assessment in power system operation. The classical deterministic methods, which compare the power system performance to a predefined set of requirements (e.g. no current and voltage violations,...
We report on an recent European Project aimed at assessment of suited Methodologies to measure interdependencies between the Electric and the ICT System. Based on best practices and available data, several different metrics have been defined. Depending on the methodology involved, three main types of metrics can be identified; namely “topological”; “system theory based” and “simulation based” metrics...
Power system security assessment both for planning (off-line) studies and for operational (on-line) applications is performed by various analysis methods which highlight different phenomena (steady-state violations, angle stability, voltage stability, etc.) in order to retrieve an exhaustive vision of the problems. Besides traditional deterministic tools, recently proposed probabilistic tools may...
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