A Power System Stabilizer Using Speed and Electrical Power Inputs???Design and Field Experience

To damp the low-frequency oscillations which occurred due to the disturbances in the electrical power system, the generators are equipped with Power System Stabilizer (PSS) that provide supplementary feedback stabilizing signals. The low-frequency oscillations in power system are classified as local mode oscillations, intra-area mode oscillation, and interarea mode oscillations. Double input multiband Power system stabilizers (PSSs) were used to damp out low-frequency oscillations in power system. Among dual-input PSSs, PSS4B offers superior transient performance. Power system simulator for engineering (PSS/E) software was adopted to test and evaluate the dynamic performance of PSS4B model on Iraqi national grid. The results showed that after installing the PSS in a specific plant the oscillation of rotor angle, bus frequency, speed, power flow is better than without PSS during the disturbances that occurred during the simulations. All the PSS/E simulation and tests were done in the National dispatch center (NDC) laboratory, Ministry of Electricity.

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Improvement of Power System Dynamic Stability Based on Fuzzy Logic Power System Stabilizer (FLPSS)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.793.139 ◽

2015 ◽

Vol 793 ◽

pp. 139-143

Author(s):

Muhamad Irwanto ◽

N. Gomesh ◽

Y.M. Irwan ◽

F. Malek ◽

M.R. Mamat ◽

...

Keyword(s):

Fuzzy Logic ◽

Power System ◽

Block Diagram ◽

Electrical Power ◽

System Stability ◽

Power System Stabilizer ◽

Dynamic Power ◽

State Variable ◽

Variable Equation ◽

System Stabilizer

Generally this project is to improve the dynamic power system stability using fuzzy logic power system stabilizer (FLPSS) which applied to the excitation system. This research is started by electric power system mathematic modelling (state variable equation) and block diagram then set membership function of fuzzy logic power system stabilizer (FLPSS). Block diagram model (plant system) is formed from state variable equation. The plant is controlled by fuzzy logic power system stabilizer (FLPSS) which its input and output from the rotor speed and to excitation system, respectively. To observe the oscillation of dynamic power system stability, the electrical power is varied ± 0.1 pu (positive and negative value indicate an increasing and decreasing electrical power, respectively). The result shows that using FLPSS, the oscillation of dynamic power system can be improved. The overshoot of electric power and rotor speed change oscillation after the disturbance is smaller than the conventional, and also the time to reach the steady state is faster.

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A Power System Stabilixer Using Speed and Electrical Power Inputs-Design and Field Experience

IEEE Transactions on Power Apparatus and Systems ◽

10.1109/tpas.1981.316966 ◽

1981 ◽

Vol PAS-100 (9) ◽

pp. 4151-4157 ◽

Cited By ~ 51

Author(s):

D.c. Lee ◽

R.E. Beaulieu ◽

J.R.R. Service

Keyword(s):

Power System ◽

Field Experience ◽

Electrical Power ◽

Power Inputs

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Stability enhancement of power system with the implementation of power system stabilizer PSS and excitation system IEEE Type-1

Journal of Physics Conference Series ◽

10.1088/1742-6596/2120/1/012022 ◽

2021 ◽

Vol 2120 (1) ◽

pp. 012022

Author(s):

Abumuslim Khujaev ◽

Chockalingam Aravind Vaithilingam ◽

Ahmad Adel Alsakati ◽

Jamal Alnasseir

Keyword(s):

Power System ◽

Transient Stability ◽

Electrical Power ◽

Stable Condition ◽

Synchronous Generator ◽

Electric Power System ◽

Power System Stabilizer ◽

Excitation System ◽

System Stabilizer

Abstract Stability of power system is an ability of an electric power system that reaches its stable condition after fault happens in its network. The system is unstable when one generator loses its stable synchronism performance. This paper investigates the transient stability of an IEEE 9-bus system during faults that happen in different bus locations. Additionally, the analysis contributes to the integration of the exciter IEEE type-1 for synchronous generator and integration of power system stabilizer (PSS) to improve the power angle stability in the power system. The fault at bus 4 has the highest amplitude in which it increases to 77.58 degrees for the power angle of Synchronous Generators (SGs). The absence of PSS showed that the existing system oscillated and it is unstable. However, the integration of PSS enables the system to damp the oscillations of power angle and reduce the settling time to 5.69 seconds during the fault at bus 4. Moreover, the PSS is connected to SGs through the excitation system to improve the stability of the system in relative power angle of SGs, speed deviation, and electrical power of SGs. Hence, the integration of PSS and excitation system enhances the transient stability of the power system.

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