The growing need for sustainable energy solutions has propelled the development of Hybrid Renewable Energy Systems (HRESs), which integrate diverse renewable sources like solar, wind, biomass, geothermal, hydropower and tidal. This review paper focuses on balancing economic, environmental, social technical criteria to enhance system performance resilience. Using comprehensive methodologies, examines state-of-the-art algorithms such as Multi-Objective Particle Swarm Optimization (MOPSO)...

The traditional unidirectional, passive distribution power grids are rapidly developing into bidirectional, interactive, multi-coordinated smart that cover distributed generation along with advanced information communications and electronic technologies. To better integrate the use of renewable energy resources grid, to improve voltage stability grids, grid protection reduce harmonics, one needs select control devices adjustable reactive (capacitor batteries, transformers, reactors) provide...

The paper deals with the short-term forecasting of wind speed for Laukžeme farm (Lithuania) using time series approach. ARIMA model was selected and its best structure determined historical data (4 months) varying both learning interval (3–5 days) factual averaging (1–6 hours). accuracy evaluated in terms RMSE absolute error. results 39 consecutive intervals 6–48 hourly forecasts are presented discussed.

The rapid development of renewable energy sources and electricity storage technologies is further driving the change evolution traditional systems. aim to interconnect different systems between within countries ensure greater reliability flexibility. However, challenges are faced in reaching it, such as power grid complexity, system control, voltage fluctuations due reverse flow, equipment overloads, resonance, incorrect island setting, diversity user needs. digitalization market also...

In the past few years, technical progress has determined traditional electric power system conversion to Smart Grids, and consequently empowered a worldwide renaissance in forgotten PQ field. Since installation of monitors is currently associated with high investments operational costs, it inappropriate install monitor on each grid busbar. Hence, operators must establish best cost–benefit scenario for achieve maximal observability limited number analyzers. Firstly, this paper presents review...

The proposed method, based on three combined criteria—Sn—design capacity of the power line, LF, (line flow)—power flow in an electric transmission MVA, and ratio LF/Sn—allows for ranking lines when calculations are performed normal/pre-emergency modes. A set criteria used to study critical/post-emergency N-k modes is developed. simulations were real Baltic 330 kV electricity system. results reveal that system operates different load modes, most critical determined by our method fall into...

As the number of available renewable energy sources has increased annually, there been a corresponding rise in levels pollution created by traditional electricity generation, ultimately contributing to breaking down stability electrical system at large. Therefore, is an increasing need integrate use nonpolluting sources, such as pumped storage hydropower plants (PSHP), ensure power and maintain frequency from year-to-year. This paper addresses issue PSHP being unsuitable for providing...

The paper presents a Markov chain reliability model of cogeneration power plant substation. Stochastic automata networks formalism and functional transition rates were used to specify the behavior system. Iterative solution techniques find steady-state models with different sets randomly generated failure repair rates. Modeling results perform uncertainty sensitivity analysis model.DOI: http://dx.doi.org/10.5755/j01.eee.19.5.1214

Abstract The paper analyses the performance results of recently developed short-term forecasting suit for Latvian power system. system load and wind are forecasted using ANN ARIMA models, respectively, accuracy is evaluated in terms errors, mean absolute errors percentage errors. investigation influence additional input variables on performed. interplay hourly loads also with historical (the year 2011) planned capacities 2023).

Nowadays, voltage sag continues to remain a critical PQ issue in the industry. Since it is not possible install analyzer on every node, optimal monitoring locations must be determined. However, during campaign of Lithuanian DSO grid, execution this task was inhibited by lack knowledge and literature about fundamentals sags propagation. Therefore, first part paper investigates propagation paths using matrix method created test which for time BRELL-based. This only investigate (both downward...

This paper focuses on both voltage transients and short-duration RMS variations, presents a unique heterogeneous approach to their assessment by applying AI tools. The database consists of real (obtained from Lithuanian PQ monitoring campaigns) synthetic data the simulation literature review). Firstly, this investigates fundamental grid component its harmonics filtering with an IIR shelving filter. Secondly, in key part, SVM KNN are used classify events primary cause voltage–duration plane...

Straipsnyje apžvelgiami išmaniųjų tinklų plėtros ypatumai. Aptariama išmaniojo tinklo kaip šiuolaikinio pažangaus elektros samprata ir ateities vizija, jo diegimo teisinio reglamentavimo aspektai, parodoma, kad dabartiniame raidos etape vyrauja bandomieji projektai. Pažymima, kūrimas šiuo metu Europoje vyksta natūralus techninės pažangos procesas, o ne privalomos politikos vykdymas. Pateikiama bendra schema, susidedanti iš bandomųjų infrastruktūros projektų, jos finansavimo šaltiniai....

grounding is important for human safety. Therefore, it very to periodically check the resistance values of devices and their compliance with normative value, measure them accurately. The accuracy results influenced not only by chosen measuring device but also method. A properly measurement method allows obtaining appropriate will save costs time.

As renewable energy sources (RES) generation increases, power system operators face significant challenges in maintaining the reliability and security of system. The rise non-inertial small isolated systems leads to dangerously low levels inertia a higher probability detecting rate change frequency (RoCoF). Regulations issued by ENTSO-E aim provide additional mitigations requirements for transmission ensure stability One approach addressing decreasing amount is through synthetic inertia....

The right choice of windmill type, connection place, power size and rate statistic dynamic parameters system is the scientific, technical technological problem. Existing systems with windmills measurement summation are using to tackle Mathematic models calculation. single lumped mass drive train model mostly used. But simplified two-mass 3-th -5-th number Thevenin mathematic gives better results. consists inertia both turbine generator. connecting shaft modeled as a spring damper.