scholarly journals Research on Governor Parameter Optimization to Suppress Ultra-Low Frequency Oscillation of Power System Caused by Hydropower Unit

2021 ◽  
Vol 2087 (1) ◽  
pp. 012001
Author(s):  
Wei Yan ◽  
Yunbang Sun
Keyword(s):  
Single Machine ◽  
Optimization Algorithm ◽  
Low Frequency ◽  
System Model ◽  
Regulation System ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Speed Regulation ◽  
Damping Torque ◽  
The Relationship

Abstract In the actual power system with hydropower, long-time and ultra-low frequency oscillation events occur many times. It is found that the unreasonable setting of governor parameters is an important reason for the oscillation. Firstly, the single machine on load system model is used to analyse the relationship between the PID parameters of the governor and the system stability, then the relationship between oscillation mode and PID parameters of governor is analyzed by eigenvalue analysis method, and the negative damping provided by speed regulation system is analyzed by damping torque method, and then the particle swarm optimization algorithm is used to optimize the PID parameters. Through the analysis of the step response of the single machine system before and after the optimization and the damping torque coefficient provided by the speed regulation system, it shows the effectiveness of the optimization algorithm. Finally, in the simulation platform MATLAB/SIMULINK, a single machine load system model which is closer to the actual power grid is built. The governor parameters of the generator are simulated and verified, and the PID parameters are adjusted by using the parameters obtained by the optimization algorithm. The results show that the optimized parameters have a good suppression for the ultra-low frequency oscillation.

The Analysis on the Effect of Speed Regulating System on Low Frequency Oscillation

2015 ◽  
Vol 737 ◽  
pp. 220-225
Author(s):  
Tong Tian Deng ◽  
Jia Sheng Wang ◽  
Xiao Jun Li ◽  
Xi Tian Wang ◽  
Jin Fu Liu ◽  
...  
Keyword(s):  
Control System ◽  
Forced Oscillation ◽  
Oscillation Mode ◽  
Low Frequency ◽  
Speed Control ◽  
Regulation System ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Speed Regulation ◽  
Speed Control System

With the strengthening of interconnected power grid connection, interval oscillation mode damping continue to improve, interval power oscillation accidents still occur, however, the negative damping mechanism of the classic cannot be satisfactorily explain these phenomena, this paper provides the researches forced oscillation mechanism of the low frequency oscillation, the speed control system is likely to form the forced oscillation source, speed regulation system and low frequency oscillation formed an adverse coupling effect. In this paper, based on the mechanism of their method, speed control system are analyzed, the effect of various parameters on the low frequency oscillation in order to avoid speed regulation system to participate in the low frequency oscillation provides technical support.

Improvement Model Damping Low Frequency Oscillations Presence UPFC by Cuckoo Optimization Algorithm

2016 ◽  
Vol 3 (1) ◽  
pp. 67
Author(s):  
M. Yousefi Anarkooli ◽  
H. Afrakhteh
Keyword(s):  
Optimization Algorithm ◽  
Power Flow ◽  
Low Frequency ◽  
Control Voltage ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Software Environment ◽  
Cuckoo Optimization Algorithm ◽  
Low Frequency Oscillations ◽  
Oscillation Damping

<p>Low frequency oscillation (LFO) is a negative phenomenon repeated for the power system increases the risk of instability. In recent years, power systems stabilizer (PSS) for damping low frequency oscillations is used. With FACTS devices such as integrated power flow controller (UPFC) can control power flow and  transient   stability increase.  So, UPFC low   frequency oscillation damping can be used instead of PSS. UPFC through direct control voltage and low frequency oscillation damping can be improved. In this study, a single linear model of synchronous machine connected to an infinite bus Heffron-Philips in the presence of UPFC to improve low frequency oscillation damping is used. The selection of the output feedback parameters for the UPFC controllers is converted to an optimization problem which is solved by cuckoo optimization algorithm (COA). COA, as a new evolutionary optimization algorithm, is used in multiple applications. This optimization algorithm has a strong ability to find the most optimistic results for dynamic stability improvement. The controller UPFC and damping in MATLAB software environment is designed and simulated. The simulation was performed for a variety of loads and for various loads and more effective UPFC controller electromechanical oscillation damping compared to other algorithm types is shown.</p>

Research of PSS on the Inhibiting Effect of Low Frequency Oscillation

2013 ◽  
Vol 575-576 ◽  
pp. 504-509
Author(s):  
Ang Li
Keyword(s):  
Power System ◽  
Low Frequency ◽  
Synchronous Generators ◽  
Operating Characteristics ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Single Machine Infinite Bus ◽  
System Stabilizer ◽  
Damping Torque ◽  
Power System Dynamic Stability

With the continuous spreading of scale in power system and introducing of fast excitation system, the problem of low frequency oscillation which is arosed because of lacking-damping becomes worse and worse. This paper analyzes the mechanism reasons of insufficient-damping, using an auxiliary control unitpower system stabilizer (PSS) to increase the damping torque. Through established a simulation model of excitation control system on a typical single machine-infinite bus system, simulates the synchronous generators transient operating characteristics under large and small disturbances, and the simulation results show that the design can improve the system damping and the generator operating characteristics, increase power system dynamic stability.

Low-frequency-oscillation characteristics of ionization distribution in Hall thruster channels

Vacuum ◽  
2021 ◽  
pp. 110320
Author(s):  
Tianyuan Ji ◽  
Liqiu Wei ◽  
Haifeng Lu ◽  
Shangmin Wang ◽  
Ning Guo ◽  
...  
Keyword(s):  
Low Frequency ◽  
Hall Thruster ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Characteristics
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