A distributed generation (DG) system with a photovoltaic (PV) source supported by energy storage devices and feeding dc- ac-loads in islanded-mode operation, is considered analyzed. As all the DG parts are interfaced through power electronic dc/dc or dc/ac converters, control strategy introduced which applied directly on each individual duty-ratio converter input. The aim of design to drive PV-array production at maximum ensure instantaneous balance limits capacity. In this scheme, critical...

The escalating occurrences of transmission congestions, overvoltages, undervoltages, power oscillations, and frequency abnormalities in systems underline the need for a comprehensive review enhancement traditional management operation tools creation new ones able to obtain real-time data from field analysis operation. Jointly with an improvement dynamic models grid, this will result better understanding system behavior especially critical situations.

A novel nonlinear method of analysis is deployed in detail with the aim to design suitable controllers guaranteed stability for grid-connected photovoltaic (PV) systems driven by power converters. By this method, all system nonlinearities are considered order allow a reliable wide range operation and avoid instabilities that as shown article can be occurred inappropriate design. To end, first, detailed accurate dynamic model presented PV including cascade-mode control scheme. Then,...

Hypothesis generation in molecular and cellular biology is an empirical process which knowledge derived from prior experiments distilled into a comprehensible model. The requirement of automated support exemplified by the difficulty considering all relevant facts that are contained millions documents available PubMed. Semantic Web provides tools for sharing knowledge, while information retrieval extraction techniques enable its literature. Their combination makes computational analysis...

The proliferation of heterogeneous computing platforms presents the parallel community with new challenges. One such challenge entails evaluating efficacy architectures and identifying architectural innovations that ultimately benefit applications. To address this challenge, we need benchmarks capture execution patterns (i.e., dwarfs or motifs) applications, both present future, in order to guide future hardware design. Furthermore, desire a common programming model for facilitates code...

The increasing penetration of variable renewable energy (VRE) sources into the electrical grid poses significant challenges for balancing power system supply and demand. In order to cope with these challenges, flexibility is needed. Therefore, operators need evaluate plan ahead adequacy their systems in ensure reliable operation under high VRE penetration. this context, we present a suitable high-level assessment study applied on real system, namely Greek that based actual data can provide...

For decades, the streaming architecture of FPGAs has delivered accelerated performance across many application domains, such as option pricing solvers in finance, computational fluid dynamics oil and gas, packet processing network routers firewalls. However, this come at significant expense programmability, i.e., performance-programmability gap. In particular, FPGA developers use a hardware design language (HDL) to implement data path modules for computation pipelines, memory management,...

Programming FPGAs has been an arduous task that requires extensive knowledge of hardware design languages (HDLs), such as Verilog or VHDL, and low-level details. With OpenCL support for FPGAs, the design, prototyping implementation FPGA is increasingly moving towards a much higher level abstraction, when compared to intrinsically nature HDLs. On other hand, in context traditional (i.e., CPU) software development, still considered be complex because programmer needs manually expose...

In this paper we examine and compare the efficiency of four European electricity markets (NordPool, Italian, Spanish Greek) different microstructure level maturity, by testing weak form Efficient Market Hypothesis (EMH). To quantify deviation each market from ‘ideal’ or ‘benchmark random walk’, have constructed a Composite Electricity Efficiency Index (EMEI), inspired similar works on other energy commodities. The proposed index consists linear nonlinear components one measuring feature...

The integration of distributed energy resources (DERs) in modern power systems has substantially changed the local control capabilities grid since majority DERs are connected through a controlled dc/ac inverter interface. Such long-distance located DER installations, usually represented by current regulated dc sources, can inject large amounts into main ac at points where strength connection is low. efficient and stable performance such scheme related to capability applied retain extraction...

Increasing the generation of electric power from renewable energy sources (RESs) creates important challenges to transmission system operators (TSOs) for balancing system. To address these challenges, adequate flexibility is required. In this context, TSOs carry out assessment studies evaluate level and ensure that a stable operation under high RESs integration can be achieved. These take into consideration numerous scenarios incorporating different assumptions temperature, penetration, load...

The challenging issue of designing stable active power controllers for photovoltaic (PV) systems interfaced to the load with dc/dc boost converters is addressed in this paper. In particular, exploiting inherent voltage and current ripple converters, a new proportional-integral (PI) controller error variable power-voltage gradient proposed which capable ensure maximum point (MPP) operation. Taking into account nonlinear model PV source accurate dynamics converter an extensive stability...

A nonlinear current-mode proportional-integral (PI) controller is proposed for the challenging problem of regulating output voltage a dc/dc boost power converter. For analysis, accurate average model converter used, while new advanced passivity-based stability analysis applied. Particularly, it firstly proven that closed-loop system passive and unique equilibrium exists. sequential method constructing suitable Lyapunov storage function entire system, which capable to prove input-to-state...

Voltage source converters operating under current-mode controllers perform a standard and extremely common scheme in many industrial applications. In this paper, the open problem of designing analyzing such nonlinear systems is addressed. To end, novel passivity-based stability analysis developed that takes into account accurate entire model system with proposed proportional-integral (PI) selected to be independent from parameters. particular, new sequential method provides suitable Lyapunov...

General-purpose computing on an ever-broadening array of parallel devices has led to increasingly complex and multi-dimensional landscape with respect programmability performance optimization. The growing diversity architectures presents many challenges the domain scientist, including device selection, programming model, level investment in All these choices influence balance between performance. In this paper, we characterize achievable across a range optimizations, along their...

A distributed power generation system controlled through the duty-ratio inputs of converters used to interface a photovoltaic source and ac-grid common bus is considered. For control design, standard local cascaded scheme adopted for each individual input while nonlinear stability analysis deployed complete system. To this end, model integration proposed that includes all units along with suitable current-mode, inner-loop fast controllers. Taking into account some basic features forced...