Impact of Virtual Synchronous Generators on Inter-Area Low Frequency Oscillation

2020 ◽  
Author(s):  
Dawei Sun ◽  
Yiqun Li ◽  
Qian Wang ◽  
Yazhou Luo ◽  
Hui Liu ◽  
...  
Keyword(s):  
Low Frequency ◽  
Synchronous Generators ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation

scholarly journals Study of small signal stability using PSAT including DFIG based wind penetration

2019 ◽  
Vol 2 (1) ◽  
pp. 137-145
Author(s):  
Ram Prasad Pandey
Keyword(s):  
Power System ◽  
Wind Power ◽  
Transient Stability ◽  
System Analysis ◽  
Low Frequency ◽  
Synchronous Generators ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Global Mode ◽  
The Impact

In early days of power engineering, the power system consisting of synchronous generators faced different low frequency oscillation problems and they were solved by different researchers by using suitably AVR and PSS. Later, the electricity industry is turning increasingly to renewable sources of energy to generate electricity. Wind is the fastest growing and the most widely utilized emerging renewable energy technology for power generation at present. With the increasing penetration of wind power in the power system, the impact in power system performance should be fully investigated, particularly for doubly fed induction generation (DFIG) wind turbine since this type of renewable source is gaining prominence in the power system industry. Main purpose of this study is to examine the impacts of wind power integration in the low grid from low frequency oscillation perspective. The benchmarked Two Area System is considered for this analysis using Power System Analysis Toolbox (PSAT). The critical modes of oscillation are selected from eigenvalue analysis and their participation factors are studied to identify their sensitivity. Also the time domain analysis is run in every cases to study the transient stability. From TAS, concept of local and global mode oscillation can be understood clearly. Replacing synchronous generators in TAS by DFIG WTG one by one of same rating gave conclusion that low frequency stability depends on the location of DFIG penetration and operating scenario. The results show that there is both beneficial and detrimental effects due to DFIG WTGs. The installation of PSS in the critical generators greatly enhances the system damping.

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

A Parametric Study of Low-Frequency Damping of Mooring System

2014 ◽  
Author(s):  
Minglu Chen ◽  
Shan Huang ◽  
Nigel Baltrop ◽  
Ji Chunyan ◽  
Liangbi Li
Keyword(s):  
Low Frequency ◽  
Structure Design ◽  
The Body ◽  
Body Motion ◽  
Mooring Line ◽  
Offshore Structure ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Line System ◽  
Irregular Wave

Mooring line damping plays an important role to the body motion of moored floating platforms. Meanwhile, it can also make contributions to optimize the mooring line system. Accurate assessment of mooring line damping is thus an essential issue for offshore structure design. However, it is difficult to determine the mooring line damping based on theoretical methods. This study considers the parameters which have impact on mooring-induced damping. In the paper, applying Morison formula to calculate the drag and initial force on the mooring line, its dynamic response is computed in the time domain. The energy dissipation of the mooring line due to the viscosity was used to calculate mooring-induced damping. A mooring line is performed with low-frequency oscillation only, the low-frequency oscillation superimposed with regular and irregular wave-frequency motions. In addition, the influences of current velocity, mooring line pretension and different water depths are taken into account.

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