Simulation of low frequency undamped oscillations in large power systems

Low frequency oscillations in large power systems may result in system instability under large disturbances. Power system stabilisers (PSS) play an effective role in damping these low frequency oscillations by injecting a modulating signal in the excitation loop of a synchronous machine. A new metaheuristic optimisation algorithm termed the sine cosine algorithm (SCA) was proposed for optimising PSS controller parameters to obtain an optimal solution with the damping ratio as an objective function. The SCA technique was examined on a single machine infinite bus (SMIB) system under distinct loading situations and matched with a moth flame optimisation technique and evolutionary programming to design a robust controller of PSS. The simulation was accomplished using a linearised mathematical model of the SMIB. The performance of a designed lead lag-controller of PSS was demonstrated using eigenvalue analysis with simulations, showing promising results. The dynamic performance was validated with respect to the damping ratio, the eigenvalue’s location in the s-plane and rotor angle deviation response to demonstrate system stability.

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On-line Estimation of Power System Low Frequency Oscillatory Modes in Large Power Systems

Journal of International Council on Electrical Engineering ◽

10.5370/jicee.2011.1.3.352 ◽

2011 ◽

Vol 1 (3) ◽

pp. 352-358 ◽

Cited By ~ 2

Author(s):

Chairerg Jakpattanajit ◽

Naebboon Hoonchareon ◽

Akihiko Yokoyama

Keyword(s):

Power Systems ◽

Power System ◽

Low Frequency ◽

Large Power ◽

On Line

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A practical analysis method of low frequency oscillation for large power systems

IEEE Power Engineering Society General Meeting, 2005 ◽

10.1109/pes.2005.1489377 ◽

2005 ◽

Cited By ~ 3

Author(s):

Ying Huang ◽

Zheng Xu ◽

Wulue Pan

Keyword(s):

Power Systems ◽

Low Frequency ◽

Analysis Method ◽

Frequency Oscillation ◽

Low Frequency Oscillation ◽

Large Power ◽

Practical Analysis

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Damping Low Frequency Oscillations via FACTS-POD Controllers Tuned by Bees Algorithm

ELEKTRIKA- Journal of Electrical Engineering ◽

10.11113/elektrika.v17n2.62 ◽

2018 ◽

Vol 17 (2) ◽

pp. 6-14 ◽

Cited By ~ 1

Author(s):

Nurul Aziah Arzeha ◽

Mohd Wazir Mustafa ◽

Rasyidah Mohamad Idris

Keyword(s):

Power Systems ◽

Low Frequency ◽

System Stability ◽

Bees Algorithm ◽

Large Power ◽

Mechanical Oscillations ◽

Three Phase ◽

Power Oscillation Damping ◽

Flexible Alternating Current Transmission ◽

Oscillation Damping

Power systems are often subject to low frequency electro-mechanical oscillations resulting from electrical disturbances and consequence of the development of interconnection of large power system. Flexible Alternating Current Transmission System (FACTS) devices with Power Oscillation Damping (POD) as the supplemet controller has been recent research interest in damping the oscillation. Bees Algorithm (BA) is applied to optimized the parameters of the FACTS-POD controller. The main objective of optimization is to improve the system stability by moving the electro-mechanical eigenvalues on the s-plane to the left as far as possible. The controller is tested on a 3-machine 9-bus system and simulated in PSAT in MATLAB environment. The system is disturbed by increasing 10% mechanical input to Generator 2 and second disturbance is the system experiencing a three-phase fault. The performance of the system with the FACTS-POD controller is observed in terms of position of electromechanical eigenvalues on s-plane and damping responses of power oscillations where both terms shows significant improvement as compared to the system without FACTS-POD controller.

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THE ANALYSIS OF OPERATION MODES OF ENERGY STORES IN AUTONOMOUS HYBRID POWER PLANTS WITH RENEWABLE ENERGY RESOURCES

Alternative Energy and Ecology (ISJAEE) ◽

10.15518/isjaee.2018.13-15.055-067 ◽

2018 ◽

pp. 55-67

Author(s):

S. G. Obukhov ◽

I. A. Plotnikov ◽

V. G. Masolov

Keyword(s):

Renewable Energy ◽

Power Systems ◽

Low Frequency ◽

Rechargeable Batteries ◽

Energy Resources ◽

Renewable Energy Resources ◽

Hybrid Power ◽

Operation Modes ◽

Energy Stores ◽

Energy Store

The paper presents the results of the comparative analysis of operation modes of an autonomous hybrid power complex with/without the energy store. We offere the technique which defines the power characteristics of the main components of a hybrid power complex: the consumers of the electric power, wind power and photo-electric installations (the last ones have been constructed). The paper establishes that, in order to compensate the seasonal fluctuations of power in autonomous power systems with renewable energy resources, the accumulative devices are required, with a capacity of tens of MWh including devices that are capable to provide energy storage with duration about half a year. This allows abandoning the storage devices for smoothing the seasonal fluctuations in the energy balance.The analysis of operation modes of energy stores has shown that for a stock and delivery of energy on time intervals, lasting several hours, the accumulative devices with rather high values of charging and digit power aren't required. It allows using the lead-acid rechargeable batteries of the deep category for smoothing the daily peaks of surplus and a capacity shortage. Moreover, the analysis of operation modes of energy stores as a part of the hybrid complexes has demonstrated that in charging/digit currents of the energy store the low-frequency and high-frequency pulsations of big amplitude caused by changes of size of output power of the renewable power installations and loading are inevitable. If low-frequency pulsations (the period of tens of minutes) can partially be damped due to the restriction of size of the maximum charging current of rechargeable batteries, then it is essentially impossible to eliminate high-frequency pulsations (the period of tens of seconds) in the power systems with the only store of energy. The paper finds out that the combined energy store having characteristics of the accumulator in the modes of receiving and delivery of power on daily time intervals, and at the same time having properties of the supercondenser in the modes of reception and return of impulses of power on second intervals of time is best suited to requirements of the autonomous power complexes with renewable energy resources.

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A Novel Methodology for Adaptive Coordination of Multiple Controllers in Electrical Grids

Mathematics ◽

10.3390/math9131474 ◽

2021 ◽

Vol 9 (13) ◽

pp. 1474

Author(s):

Ruben Tapia-Olvera ◽

Francisco Beltran-Carbajal ◽

Antonio Valderrabano-Gonzalez ◽

Omar Aguilar-Mejia

Keyword(s):

Power Systems ◽

Power System ◽

Electric Power ◽

Large Scale ◽

Short Circuit ◽

Dynamic Performance ◽

Low Frequency ◽

Electric Power System ◽

Design Stage ◽

Positive Interaction

This proposal is aimed to overcome the problem that arises when diverse regulation devices and controlling strategies are involved in electric power systems regulation design. When new devices are included in electric power system after the topology and regulation goals were defined, a new design stage is generally needed to obtain the desired outputs. Moreover, if the initial design is based on a linearized model around an equilibrium point, the new conditions might degrade the whole performance of the system. Our proposal demonstrates that the power system performance can be guaranteed with one design stage when an adequate adaptive scheme is updating some critic controllers’ gains. For large-scale power systems, this feature is illustrated with the use of time domain simulations, showing the dynamic behavior of the significant variables. The transient response is enhanced in terms of maximum overshoot and settling time. This is demonstrated using the deviation between the behavior of some important variables with StatCom, but without or with PSS. A B-Spline neural networks algorithm is used to define the best controllers’ gains to efficiently attenuate low frequency oscillations when a short circuit event is presented. This strategy avoids the parameters and power system model dependency; only a dataset of typical variable measurements is required to achieve the expected behavior. The inclusion of PSS and StatCom with positive interaction, enhances the dynamic performance of the system while illustrating the ability of the strategy in adding different controllers in only one design stage.

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