In this paper, the overvoltage problems that might arise from integration of photovoltaic (PV) panels into low-voltage (LV) distribution networks is addressed. A distributed scheme proposed adjusts reactive and active power output inverters to prevent or alleviate such problems. The model-free makes use limited communication between controllers in form a distress signal only during emergency conditions. It prioritizes power, while curtailment performed as last resort. behavior studied using...

Large-scale integration of renewable generation, usually interfaced to the network through power electronics, has led drastic changes in system dynamics. This paper presents novel insights into stability properties such systems. For that purpose, a high-fidelity dynamic model generic low-inertia been developed. The full-order, state-of-the-art control schemes both synchronous and converter-based generators are included, with latter differentiating between grid-forming grid-following mode...

In this paper, the Unit Commitment (UC) problem in a power network with low levels of rotational inertia is studied. Frequency-related constraints, namely limitation on Rate-of-Change-of-Frequency (RoCoF), frequency nadir and steady-state error, are derived from uniform system response model that incorporates dynamics controls both synchronous generators grid-forming inverters. These constraints then included into stochastic UC formulation accounts for wind equipment contingency...

This paper presents a novel virtual synchronous machine controller for converters in power systems with high share of renewable resources. Using linear quadratic regulator-based optimization technique, the optimal state feedback gain is determined to adaptively adjust emulated inertia and damping constants according frequency disturbance system, while simultaneously preserving tradeoff between critical limits required control effort. Two designs are presented compared against open-loop...

Power system dynamic simulations are crucial for the operation of electric power systems as they provide important information on evolution after an occurring disturbance. This paper proposes a robust, accurate and efficient parallel algorithm based Schur complement domain decomposition method. The provides numerical computational acceleration procedure. Based shared-memory programming model, implementation proposed is presented. general, portable scalable inexpensive, shared-memory,...

The increasing penetration of power-electronic-interfaced devices is expected to have a significant effect on the overall system inertia and crucial impact dynamics. In future, reduction will drastic consequences protection real-time control play role in operation. Therefore, highly deregulated uncertain environment, it necessary for transmission operators be able monitor real time. We address this problem by developing validating an online estimation algorithm. estimator derived using...

A case study dealing with long-term voltage instability in systems hosting active distribution networks (DN) is reported this paper. It anticipates future situations high penetration of dispersed generation (DG), where the latter are used to keep voltages within desired limits, complement load tap changers. The interactions between transmission and DN investigated on a 3108-bus test system. involves grid, large generators, 40 DN, each DG steered by controller inspired model predictive...

Diesel generators (diesel gensets) are widely used within microgrid (MG) and off-grid systems for rural electrification, particularly in developing countries. The sizing selection techniques during the MG planning stage a key maximising cost-effectiveness minimising environmental impacts. This becomes more important hybrid mini-grid when photovoltaic (PV) electricity generation other renewable energies included system as special attention is needed to limit genset's output power, keep it...

Virtual Inertia Emulation (VIE) and traditional Active Power Droop Control (APDC) are among the most common approaches for regulating active power output of inverter-based generators. Furthermore, it has been shown that, under certain conditions, these two methods can be equivalent. However, neither those studies, nor analyses comparing control schemes with respect to their dynamical properties, have investigated impact converter operation mode. This paper explores subject by investigating...

The optimal control of distribution networks often requires monitoring and communication infrastructure, either centralized or distributed. However, most the current systems lack this kind infrastructure rely on suboptimal, fit-and-forget, local controls to ensure security network. In paper, we propose a data-driven algorithm that uses historical data, advanced optimization techniques, machine learning methods, design emulate behavior without use any communication. We demonstrate performance...

A rapid deployment of renewable generation has led to significant reduction in the rotational system inertia and damping, thus making frequency control power systems more challenging. This paper proposes a novel scheme based on Model Predictive Control (MPC) for converter-interfaced generators operating <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">grid-forming</i> mode, with goal exploiting their fast response capabilities provide service...

The increasing installation of controllable Distributed Energy Resources (DERs) in Distribution Networks (DNs) opens up new opportunities for the provision ancillary services to Transmission Network (TN) level.As penetration smart meter devices and communication infrastructure DNs increases, they become more observable with centralized optimization-based control schemes becoming efficient practical.In this paper, we propose a tractable Optimal Power Flow (OPF)-based scheme that optimizes...

When planning the investment in Microgrids (MGs), usually static security constraints are included to ensure their resilience and ability operate islanded mode. However, unscheduled islanding events may trigger cascading disconnections of Distributed Energy Resources (DERs) inside MG due transient response, leading a partial or full loss load. In this paper, min-max-min, hybrid, stochastic-robust model is proposed obtain resilient considering both High-Impact-Low-Frequency (HILF)...

Co-simulation opens new opportunities to combine mature electromagnetic transients (EMT) and phasor-mode (PM) solvers, takes advantage of their respective high accuracy execution speed. In this paper, a relaxation approach is presented, iterating between an EMT PM solver. This entails interpolating over time the phasors simulation, extracting from evolutions representing each subsystem with proper multiport equivalent when simulating other subsystem. Various equivalents are reviewed compared...

As the need for faster power system dynamic simulations increases, it is essential to develop new algorithms that exploit parallel computing accelerate those simulations. This paper proposes a algorithm based on two-level, Schur-complement-based, domain decomposition method. The two-level partitioning provides high parallelization potential (coarse- and fine-grained). In addition, due Schur-complement approach used update sub-domain interface variables, exhibits global convergence rate....

With the current trends in renewable energy integration, concept of a 100% inverter-based power system is becoming more reality. However, existing Voltage Source Converter (VSC) control schemes for such systems focus mostly on operation low-voltage microgrids, which have different requirements from transmission perspective. This paper proposes new classification VSC strategies depending their mode operation. Then, partial grid forming introduced and it shown that with zero rotational inertia...

A large-scale integration of renewable generation,usually interfaced to the network through power electronics,has led an overall decrease in system inertia. This paper presents novel insights on fundamental stability properties such systems. For that purpose, a uniform set Differential-Algebraic Equations (DAEs) describing generic,low-inertia has been developed. full-order, state-of-the-art control scheme both synchronous and converter-based generators are included, with latter...

The large-scale integration of renewable generation and the gradual decommissioning conventional power plants has led to decreased availability resources for providing services support bulk transmission grid. This paper presents a novel methodology system through control thousands small distributed energy (DERs), located in distribution systems. scheme is expected serve jointly with other classical countermeasures against instability conditions. proposed method model-free, scalable, does not...

Abstract The growing penetration of Converter‐Interfaced Generators (CIG) in electricity grids has diminished inertia levels. Micro‐Grids (MGs), with their high CIGs, are particularly vulnerable to the reduced levels presenting a challenge secure and reliable operation. MG system planning must now incorporate analysis dynamic security complementing traditional resource adequacy assessments. However, integrating transient constraints into is complex due non‐convex non‐linear nature analytical...