scholarly journals A Comprehensive Review of Small-Signal Stability and Power Oscillation Damping through Photovoltaic Inverters

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7372
Author(s):  
Nikolay Nikolaev ◽  
Kiril Dimitrov ◽  
Yulian Rangelov
Keyword(s):  
Small Signal ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Power Oscillation ◽  
Power Oscillation Damping ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability ◽  
Oscillation Damping ◽  
Pv Generation

This paper focuses on the methods that ensure the rotor angle stability of electric power systems, which is most frequently analyzed with small-signal models. Over the past several decades, power system stabilizers (PSSs) for conventional excitation systems were the main tools for improving the small-signal stability of electromechanical oscillatory modes. In the last decade, power oscillation damping (POD) control implemented in photovoltaic (PV) inverters has been considered an alternative to PSSs. As PV generation undergoes massive rollout due to policy directions and renewable energy source integration activities, it could potentially be used as a source of damping, which is crucial for sustaining the rotor angle stability of the remaining in-service synchronous generators. Several studies have already been dedicated to the development of different damping strategies. This paper contributes to the existing research in power system stability by providing a comprehensive review of the effects of PV generation on small-signal stability, as well as the recent evolution of POD control through PV inverters. The features and impacts of the various ways to realize POD controllers are assessed and summarized in this paper. Currently, detailed information and discussions on the practical application of PV inverter PODs are not available. This paper is, thus, intended to initiate a relevant discussion and propose possible implementation approaches concerning the topic under study.

scholarly journals Modelling and Simulation for Small Signal Stability of Multi-machine Power System under Various Disturbance Conditions

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Ohnmar Swe
Keyword(s):  
Power System ◽  
Time Domain ◽  
Test System ◽  
Small Signal ◽  
Time Domain Simulation ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Rotor Angle ◽  
Network Fault ◽  
Signal Dynamic

This paper presents the small signal stability of multi-machine power system over the 58-Bus, 26-Machine, Yangon Distribution Network and is validated with MATLAB software under various disturbance conditions. Time-domain solution analysis is employed to determine the small signal dynamic behavior of test system. Transtability model is used to perform time-domain simulation in SIMULINK. The simulation is carried out for normal condition, reference voltage of regulator (Vref) disturbance, mechanical torque (Tm)disturbance and network (fault) disturbance and the conditions of change in center of inertia for rotor angle (delta COI),  slip for center of inertia (slip COI), field current and mechanical torque are observed. According to the simulation results, perturbation of Vref shows only instability on the system. But ramping of Tm and network disturbance can cause large disturbance on the system and unstable conditions can be observed.

scholarly journals Wide-Area Assessment of Aperiodic Small Signal Rotor Angle Stability in Real-Time

2013 ◽  
Vol 28 (4) ◽  
pp. 4545-4557 ◽  
Author(s):  
Hjortur Johannsson ◽  
Arne Hejde Nielsen ◽  
Jacob Ostergaard
Keyword(s):  
Real Time ◽  
Wide Area ◽  
Small Signal ◽  
Angle Stability ◽  
Rotor Angle ◽  
Rotor Angle Stability

scholarly journals Small Signal Stability with the Householder Method in Power Systems

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3412
Author(s):  
Asghar Sabati ◽  
Ramazan Bayindir ◽  
Sanjeevikumar Padmanaban ◽  
Eklas Hossain ◽  
Mehmet Rida Tur
Keyword(s):  
Power Systems ◽  
Dynamic Stability ◽  
Voltage Collapse ◽  
Small Signal ◽  
Small Signal Stability ◽  
Synchronous Generators ◽  
Signal Stability ◽  
Solution Methods ◽  
Rotor Angle ◽  
Electrical Center

Voltage collapse in power systems is still considered the greatest threat, especially for the transmission system. This is directly related to the quality of the power, which is characterized by the loss of a stable operating point and the deterioration of voltage levels in the electrical center of the region exposed to voltage collapse. Numerous solution methods have been investigated for this undesirable degradation. This paper focuses on the steady state/dynamic stability subcategory and techniques that can be used to analyze and control the dynamic stability of a power system, especially following a minor disturbance. In particular, the failure of one generator among the network with a large number of synchronous generators will affect other synchronous generators. This will become a major problem and it will be difficult to find or resolve the fault in the network due to there being too many variables, consequently affecting the stability of the entire system. Since the solution of large matrices can be completed more easily in this complex system using the Householder method, which is a small signal stability analysis method that is suggested in the thesis, the detection of error and troubleshooting can be performed in a shorter period of time. In this paper, examples of different rotor angle deviations of synchronous generators were made by simulating rotor angle stability deviations up to five degrees, allowing the system to operate stably, and concluding that the system remains constant.

scholarly journals Coordinated Control of Multiple Virtual Synchronous Generators in Mitigating Power Oscillation

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2788 ◽  
Author(s):  
Pan Hu ◽  
Hongkun Chen ◽  
Kan Cao ◽  
Yuchuan Hu ◽  
Ding Kai ◽  
...  
Keyword(s):  
Coordinated Control ◽  
Test System ◽  
Stable Model ◽  
Small Signal Stability ◽  
Synchronous Generators ◽  
Signal Stability ◽  
Power Oscillation ◽  
Operation Stability ◽  
Linear Differential ◽  
Oscillation Damping

Virtual synchronous generators (VSGs) present attractive technical advantages and contribute to enhanced system operation and reduced oscillation damping in dynamic systems. Traditional VSGs often lack an interworking during power oscillation. In this paper, a coordinated control strategy for multiple VSGs is proposed for mitigating power oscillation. Based on a theoretical analysis of the parameter impact of VSGs, a coordinated approach considering uncertainty is presented by utilizing polytopic linear differential inclusion (PLDI) and a D-stable model to enhance the small-signal stability of system. Subsequently, the inertia and damping of multiple VSGs are jointly exploited to reduce oscillation periods and overshoots during transient response. Simulation, utilizing a two-area four-machine system and a typical microgrid test system, demonstrates the benefits of the proposed strategy in enhancing operation stability and the anti-disturbing ability of multiple VSGs. The results conclusively confirm the validity and applicability of the method.

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