This paper presents a dynamic event data-based stability risk assessment method for power grids with high penetrations of inverter-based resources (IBRs). relies on obtaining the IBRs' DQ admittance through data and computing system's eigenvalues based models. Two critical technologies are employed in this research, including time-domain frequency-domain fitting <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math...

While <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$dq$</tex-math></inline-formula> admittance models have shown to be very useful for stability analysis, extracting of inverter-based resources (IBRs) from the electromagnetic transient (EMT) simulation environment using frequency scans takes time. In this letter, a new perturbation method based on Gaussian pulses in combination with system identification...

Abstract We consider the problem of approximating an arbitrary generic surface with a given set simple primitives. In contrast to previous approaches based on variational approximation, which are primarily concerned finding optimal partitioning input geometry, we propose integrate model selection step into algorithm in order also optimize type primitive for each proxy. Our method is joint global optimization both as well types and number used shape proxies. Thus, our performs automatic...

The sale of electric vehicles (EVs) is rapidly increasing around the world due to EVs' efficiency and energy security. Charging systems play a vital role in vehicle. can be categorized into three levels according Society Automatic Engineers (SAE). This paper presents topologies types charging systems. are simulated RT-Lab real-time simulator. input ac for Level 1 2 single-phase. system consists two diode bridge rectifiers, power factor correction (PFC) boost circuit, DC/AC converter, an LLC...

When wind farms are integrated in weak grids, stability issues such as low-frequency oscillations arise. The grid industry used synchronous condensers instead of Static Synchronous Compensator (STATCOM) to improve stability. goal this paper is compare performance the two VAR devices on improvement for grid-interconnected farms. topology structure and operation principle system with a farm, condenser or STATCOM presented. simulation performed MATLAB/SimPowerSystems environment. Simulation...

We present an implicit approach for pair-wise non-rigid registration of moving and deforming objects. Shapes interest are implicitly embedded in the 3D vector space. In this embedding space, is performed using a global-to-local framework. Firstly, non-linear optimization functional defined on distance function used to find global alignment between shapes. Secondly, incremental cubic B-spline free form deformation recover transformation parameters. Local posed terms minimising energy...

Abstract With the large-scale development of power industry, new requirements are put forward for stable operation system. Power system load forecasting refers to use historical data predict future value, which is an important part energy management The short-term process often combined with basic mechanism grid dispatching achieve balance supply and demand, reflecting highly nonlinear computing ability. premise real-time control, planning planning. At present, grey model used generally has...

A calculation approach for power system thermal security region in injection space was presented. The is an important tool to analyze and evaluate the impact of random changes growth direction on stability systems. Based DC flow model, high dimensional surface steady-state boundary can be approximately replaced by a hyperplane. However, with expansion scale, error analytic model will have greater region. Therefore, this paper proposes modification based hybrid physical model-driven...

The increasing penetration of inverter-based resources (IBRs) introduces some unexpected dynamic issues, including low-frequency oscillations. In this paper, a laboratory-scale grid-following voltage-source converter (VSC) system is implemented to demonstrate weak grid Grid-following control applied in VSC provide active power, reactive power or ac voltage control. test bed also replicated electromagnetic transient (EMT) simulation environment (MAT-LAB/SimPowerSystems) for benchmark purpose....

Abstract With the increasing number of flexible distributed energy resources, it is difficult for distribution network to control various devices directly. Therefore, managing and dispatching resources in a cluster way required. This article proposes an equivalent model‐based asynchronous dispatch framework, which composed three layers, network, clusters, resources. this economic carried out with models simplifying problem network. The numerical test results show that proposed method can...

When ac/dc converters are widely used in modern power system, harmonic component generated from non-linear electronic devices becomes a major issue. The factor correction (PFC) can be employed to reduce components and improve transmission efficiency. This paper presents three approaches model PFC circuit implemented single-phase boost converter, which is mathematical modeling, detailed modeling average modeling. Harmonic analysis of this also carried out. These models performed...

We introduce a novel method for the consolidation of unorganized point clouds with noise, outliers, non-uniformities as well sharp features. This is feature preserving, in sense that given an initial estimation normal, it able to recover features contained original geometric data which are usually contaminated during acquisition. The key ingredient our approach weighting term from normal space effective complement recently proposed techniques. Moreover, mollification step employed get...

The introduction of renewable energy sources will change the inertia and ability power systems to resist disturbances. Systems with different penetration levels may have unstable frequency after suffering disturbance events, which endanger security systems. To address above problems, in order evaluate system disturbances, this paper proposes concept boundary, i.e., maximum unbalanced that can be tolerated by within constraint. Meanwhile, further analyzes effects control types gains on...

In order to solve the operation management problems of power generation, transmission, distribution, and electricity consumption, a system optimization process network design scheme based on big data are proposed. The article first analyzes principles application methods electric in collection processing, puts forward overall structure processing according requirements system, designs deployment topology, transmission mechanism, integration with other systems. various links such as...

Опасность утечки и взрыва водорода при высоком давлении представляет серьезную угрозу безопасности установки гидрирования. На основе программного комплекса FLACS были смоделированы процесс масштаб воздействия в установке Создана высокоточная трехмерная физическая модель гидрирования, исследовано влияние эквивалентного соотношения (ER) на избыточное давление взрыве облака водорода. Показано, что диапазоне ER = 0.8 ÷ 1.4 пиковая температура, скорость распространения пламени пиковое давление,...