The Transient Stability Study of a Synchronous Generator Based on the 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.

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ANALISA WAKTU PEMUTUSAN KRITIS SUATU SISTEM KELISTRIKAN

JURNAL ILMIAH SAINS ◽

10.35799/jis.12.2.2012.741 ◽

2013 ◽

Vol 12 (2) ◽

pp. 153

Author(s):

Nathaniel L Bijang

Keyword(s):

Transient Stability ◽

Electrical Power ◽

Circuit Breaker ◽

Transient Condition ◽

Electrical Power System ◽

Circuit Breakers ◽

Voltage Level ◽

Transfer Capability ◽

Clearing Time ◽

The Stability

ANALISA WAKTU PEMUTUSAN KRITIS SUATU SISTEM KELISTRIKAN ABSTRAK Kestabilan adalah kemampuan mesin sinkron dari sistem tenaga listrik untuk mencapai kondisi stabil pada kondisi operasi baru yang sama atau identik dengan kondisi sebelum terjadi gangguan. Umumnya analisa kestabilan terbagi dalam dua kategori yaitu kestabilan steady state yaitu analisa sistem untuk kembali ke kondisi stabil setelah mengalami gangguan kecil dan kestabilan transient yaitu analisa sistem untuk kembali ke kondisi normal/stabil setelah mengalami gangguan besar. Studi/analisa stabilitas sangat diperlukan saat perencanaan pembangkit dan transmisi. Analisa/studi stabilitas sistem tenaga listrik membantu untuk menentukan setting waktu on/off relai proteksi , waktu pemutusan kritis circuit breaker, level tegangan dan kapasitas transfer diantara sistem-sistem. Kata kunci: Mesin sinkron, stabilitas, waktu pemutusan kritis CRITICAL CLEARING TIME ANALYSIS ELECTRICAL POWER SYSTEM ABSTRACT The stability problem is concerned with the behavior of the synchronous machines after a disturbance. Transient stability studies are needed to ensure the system can withstand the transient condition following a major disturbance. Frequently,such studies are conducted when new generating and transmitting facilities are planned. The studies are helpful in determining such things as the nature of the relaying system needed, critical clearing time of circuit breakers, voltage level of, and transfer capability between systems. Keywords: Synchronous machine, stability, critical clearing time

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

Energies ◽

10.3390/en13051286 ◽

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.

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Parametric Sensitivity Analysis of Rotor Angle Stability Indicators

Energies ◽

10.3390/en14165023 ◽

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.

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Dynamic stability improvement with integrated power plant scheduling method based on moment of inertia

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/926/1/012030 ◽

2021 ◽

Vol 926 (1) ◽

pp. 012030

Author(s):

Fitriani ◽

I C Gunadin ◽

A Suyuti ◽

A Siswanto

Keyword(s):

Power System ◽

Dynamic Stability ◽

Fault Location ◽

System Analysis ◽

Electrical Power ◽

Stability Study ◽

Electric Power System ◽

System Stability ◽

Electrical Power System ◽

Clearing Time

Abstract Dynamic stability is one of the important aspects of maintaining the stability of an electrical power system as a whole. Dynamic stability study is the ability of the electric power system to return to the equilibrium point after a relatively small disturbance suddenly occurs for a long time. In this paper, we offer a method of rescheduling the generator to improve system stability by looking at the critical clearing time (CCT). Changes in the CCT value are due to changes in the load on each bus. The modelling of the IEEE 14 bus system is carried out with the help of the Simulink Power System Analysis Toolbox (PSAT) 2.1.10, which is integrated with the MATLAB R. 2016a program. The simulation results show that the CCT value decreases as the fault location gets closer to the main generator.

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