Research of Sub-Synchronous Oscillations in HVDC and SSDC Designing

2014 ◽  
Vol 960-961 ◽  
pp. 1062-1067
Author(s):  
Han Chen ◽  
Chun Lin Guo ◽  
Qin Lei Chen ◽  
Zhe Ci Tang ◽  
Ya Nan Li ◽  
...  
Keyword(s):  
Simulation Model ◽  
Compensation Method ◽  
Frequency Range ◽  
Synchronous Oscillation ◽  
Phase Compensation ◽  
Frequency Scanning ◽  
Synchronous Oscillations ◽  
Electrical Damping ◽  
Oscillation Damping ◽  
Damping Controller

SSDC(Supplementary sub-synchronous oscillation damping controller) is one of effective measures to suppress the SSO(sub-synchronous oscillations) caused by HVDC. The article researched the phase compensation method of SSDC on the basis of studying the SSO and the SSDC mechanism in depth. We verified the validity of the method used by designing SSDC in an large domestic HVDC simulation model. And we find that the SSDC designed can effectively increase the positive electrical damping in the sub-synchronous frequency range with the sub-synchronous frequency scanning to suppress the SSO.

scholarly journals Proposal of a new phase compensation method for LMS adaptive control

2016 ◽  
Vol 24 (3) ◽  
pp. 124-130
Author(s):  
Sanggook LEE ◽  
Katsuhiro HIRATA ◽  
Fumiya KITAYAMA ◽  
Masashi KOBAYASHI
Keyword(s):  
Adaptive Control ◽  
Compensation Method ◽  
Phase Compensation ◽  
New Phase

scholarly journals Are Single Polymer Network Hydrogels with Chemical and Physical Cross-Links a Promising Dynamic Vibration Absorber Material? A Simulation Model Inquiry

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5127
Author(s):  
Leif Kari
Keyword(s):  
Simulation Model ◽  
Loss Factor ◽  
Polymer Network ◽  
Vibration Absorber ◽  
Vibration System ◽  
Frequency Range ◽  
Dynamic Vibration Absorber ◽  
High Loss ◽  
Dynamic Vibration ◽  
Cross Links

Tough, doubly cross-linked, single polymer network hydrogels with both chemical and physical cross-links display a high loss factor of the shear modulus over a broad frequency range. Physically, the high loss factor is resulting from the intensive adhesion–deadhesion activities of the physical cross-links. A high loss factor is frequently required by the optimization processes for optimal performance of a primary vibration system while adopting a dynamic vibration absorber, in particular while selecting a larger dynamic vibration absorber mass in order to avoid an excess displacement amplitude of the dynamic vibration absorber springs. The novel idea in this paper is to apply this tough polymer hydrogel as a dynamic vibration absorber spring material. To this end, a simulation model is developed while including a suitable constitutive viscoelastic material model for doubly cross-linked, single polymer network polyvinyl alcohol hydrogels with both chemical and physical cross-links. It is shown that the studied dynamic vibration absorber significantly reduces the vibrations of the primary vibration system while displaying a smooth frequency dependence over a broad frequency range, thus showing a distinguished potential for the tough hydrogels to serve as a trial material in the dynamic vibration absorbers in addition to their normal usage in tissue engineering.

scholarly journals Power System Dynamic Stability Improvement with UPFC using LQR Technique

2019 ◽  
Vol 9 (1) ◽  
pp. 1714-1719
Keyword(s):  
Power Systems ◽  
Value Analysis ◽  
Systems Model ◽  
Eigen Value ◽  
Controller Performance ◽  
Power Oscillation Damping ◽  
Oscillation Damping ◽  
Power System Dynamic Stability ◽  
Simulation Condition ◽  
Damping Controller

Many damping controller devices based on other techniques have been proposed time to time. For the study of the damping performance, it has been proposed a power systems model with ‘UPFC’ and power oscillation damping controller in the present article. The proposed controller performance has been studied under different simulation condition results and that also includes various loading condition, i.e., normal with 100 percent, under loading 80 percent and overloading with 120 percent at different operational points. Finally, a better result has been observed by using the proposed damping controlling device than earlier available existing devices. However, the result obtained by using Eigen value analysis is supported by the facts obtained by the settling time analysis and the analysis of simulation results

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