scholarly journals Qualitative and Quantitative Transient Stability Assessment of Stand-Alone Hybrid Microgrids in a Cluster Environment

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1286
Author(s):  
Kishan Veerashekar ◽  
Halil Askan ◽  
Matthias Luther
Keyword(s):  
Transient Stability ◽  
System Stability ◽  
Stability Assessment ◽  
Large Signal ◽  
Operating Modes ◽  
Stability Point ◽  
Cluster Environment ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

Neighboring stand-alone hybrid microgrids with diesel generators (DGs) as well as grid-feeding photovoltaics (PV) and grid-forming battery storage systems (BSS) can be coupled to reduce fuel costs and emissions as well as to enhance the security of supply. In contrast to the research in control and small-signal rotor angle stability of microgrids, there is a significant lack of knowledge regarding the transient stability of off-grid hybrid microgrids in a cluster environment. Therefore, the large-signal rotor angle stability of pooled microgrids was assessed qualitatively and also quantitatively in this research work. Quantitative transient stability assessment (TSA) was carried out with the help of the—recently developed and validated—micro-hybrid method by combining time-domain simulations and transient energy function analyses. For this purpose, three realistic dynamic microgrids were modelled regarding three operating modes (island, interconnection, and cluster) as well as the conventional scenario “classical” and four hybrid scenarios (“storage”, “sun”, “sun & storage”, and “night”) regarding different instants of time on a tropical partly sunny day. It can be inferred that, coupling hybrid microgrids is feasible from the voltage, frequency, and also transient stability point of view. However, the risk of large-signal rotor angle instability in pooled microgrids is relatively higher than in islanded microgrids. Along with critical clearing times, new stability-related indicators such as system stability degree and corrected critical clearing times should be taken into account in the planning phase and in the operation of microgrids. In principle, a general conclusion concerning the best operating mode and scenario of the investigated microgrids cannot be drawn. TSA of pooled hybrid microgrids should be performed—on a regular basis especially in the grid operation—for different loading conditions, tie-line power flows, topologies, operating modes, and scenarios.

scholarly journals The Transient Stability Study of a Synchronous Generator Based on the Rotor Angle Stability

2015 ◽  
Vol 5 (6) ◽  
pp. 1319 ◽  
Author(s):  
Selwa Fetissi ◽  
Djamel Labed ◽  
Imen Labed
Keyword(s):  
Transient Stability ◽  
Electrical Power ◽  
Circuit Breaker ◽  
Stability Study ◽  
Electrical Power System ◽  
Step Method ◽  
Clearing Time ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

Transient stability is an important aspect in the operation of electrical power system. In case of fault occurs in the system, the determining of fault clearing time of circuit breaker is considered one of the main factors to ensure power transfer of the system. This paper is aim to study the transient stability of single machine infinite bus system (SMIB), based on the rotor angle stability. The study is performed to determine the influence of the critical clearing time of the circuit breakers on the rotor angle stability of the generator in the case of three phase fault. For obtaining and determining numerically the nature of the rotor angle of machine, we applied the Step-by-step method for different values of fault clearing time. The results of simulation indicate that determine of critical clearing time is a major evaluation in stability studies. The system model is created in MATLAB/ SIMULINK software.

Novel Real-Time Stability Assessment Algorithm Based on Synchro-Phasors Measurement and Parallel Algorithms for Multi-Machine Networks.

2012 ◽  
Vol 13 (3) ◽  
Author(s):  
Mohamed Abdelwahhab Ali ◽  
Wagdy Mohamed Mansour ◽  
Wael Refaat Anis ◽  
Fahmy Metwally Bendary
Keyword(s):  
Power Systems ◽  
Parallel Algorithms ◽  
Real Time ◽  
Transient Stability ◽  
Test System ◽  
System Stability ◽  
Stability Assessment ◽  
Varying Coefficients ◽  
Rotor Angle ◽  
Time Varying Coefficients

Abstract The introduction of wide area measurements has brought a need for real time assessment methods of power systems, which are accurate and fast. The time varying coefficients in synchronous machine equations make it difficult to find solutions to obtain machine voltages, currents and flux linkages when expressed in phase quantities under transient conditions. The paper presents an approach to design power system transient stability assessment using direct methods for a multi-machine network based on multiple synchronized phasors, measured from Phasor Measurement Units (PMUs) and generator parameters. The generator rotor angle was derived from phasor measurements of voltage and current, and generator parameters using direct algorithm . The method assumes that a temporary fault is applied to the system therefore the pre-fault and post-fault conditions are similar. The multi-machine system was reduced to groups denoted Single Machine to Equivalent Bus (SMEB) models and another groups denoted Load Equivalent Bus (LEB) using Parallel Algorithms (PAs) [1]. The use of these PAs eliminates the SPMUs at each bus in the system, and it is required number of SPMUs only equals the number of generator buses. So that, the Equal Area Criterion in both rotor angle domain and time domain can be applicable for the SMEBs groups to assess the system stability in real-time through the Synchro-Phasors Measurements Units (SPMUs). A temporary three phase fault was simulated at test system comprises 2-machine, 8-bus network for validating the novel algorithm.

scholarly journals Model-Free MLE Estimation for Online Rotor Angle Stability Assessment With PMU Data

2018 ◽  
Vol 33 (3) ◽  
pp. 2463-2476 ◽  
Author(s):  
Shaopan Wei ◽  
Ming Yang ◽  
Junjian Qi ◽  
Jianhui Wang ◽  
Shiying Ma ◽  
...  
Keyword(s):  
Stability Assessment ◽  
Model Free ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

scholarly journals Parametric Sensitivity Analysis of Rotor Angle Stability Indicators

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5023
Author(s):  
Ashish Shrestha ◽  
Francisco Gonzalez-Longatt
Keyword(s):  
Sensitivity Analysis ◽  
Power Systems ◽  
Power System ◽  
Transient Stability ◽  
Damping Ratio ◽  
Parametric Sensitivity ◽  
Parametric Sensitivity Analysis ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

With the increasing penetration rate of Power Electronic Converter (PEC) based technologies, the electrical power systems are facing the problem of transient stability since the PEC based technologies do not contribute to the system inertia, and the proportion of synchronous generators (i.e., the source of inertia) is in decreasing rate. In addition, PEC based technologies’ components have poor inherent damping. It is very important to analyze the system characteristics of a power system to minimize the potential instabilities during the contingencies. This paper presents the parametric sensitivity analysis of the rotor angle stability indicators for the 39-bus New England power system. The indicators of rotor angle stability analysis such as critical fault clearing time (CCT), Eigenvalue points, damping ratio, frequency deviation, voltage deviation, and generator’s speed deviation are identified and analyzed for three case scenarios; each scenario has six sub-cases with different inertia constants. The results show that the CCTs for each component will be reduced if the inertia reduces at any section of a multi-machine power system. Although the applied three scenarios with six sub-cases are identified to be stable in this analysis, the decreasing inertia constant has significant impact on the power system dynamics.

scholarly journals System Stability Analysis in Two Area System Integration with Three Renewable Energy Resources

2020 ◽  
pp. 26-38
Author(s):  
Pramod Kumar Meher ◽  
Mrs. Madhu Upadhyay
Keyword(s):  
Renewable Energy ◽  
Energy System ◽  
Test System ◽  
Cell System ◽  
System Stability ◽  
Renewable Energy Resources ◽  
Power Stability ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

Stability is the most important feature required in the modern electrical system. In recent years, grid stability problems have been detected due to the rapid growth of electrical and electronic loads. To study the system performance under the effect renewable energy based generating units the kundur’s two area system has been taken as test system. The direct integration of these resources were studied for various instability issues like rotor angle stability, power stability at the generating points of machines and distortion level in the voltage and current waveforms of the grid system. The work has proposed a universal dynamic system optimizing control for system stability enhancement in all the aspects. The MATLAB/SIMULINK environment being the platform for the system designing and implementation, The effects on the two area four machines system has been studied by integrating wind energy system without dynamics optimization control in area 1and then systems with both solar and wind with the dynamic optimization controller at area 2 was developed. The study is further carried to integration of a fuel cell system in area 1 as well. The rotor angle stability and power stability at the point of generation bus was also stabilized by the proposed control in the power system.

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