The Research of Influence of TCPST on Subsynchronous Oscillation Based on Complex Torque Coefficient Method

2021 ◽  
Author(s):  
Ningyu Zhang ◽  
Qun Li ◽  
Xinyao Zhu ◽  
Qianyun Shi ◽  
Yan Wang ◽  
...  
Keyword(s):  
Subsynchronous Oscillation ◽  
Torque Coefficient ◽  
Coefficient Method

The Comparative Analysis of SVC and STATCOM on Subsynchronous Oscillation Mitigation

2013 ◽  
Vol 756-759 ◽  
pp. 245-249 ◽  
Author(s):  
Jian Zhang ◽  
Xiang Ning Xiao ◽  
Ben Feng Gao ◽  
Chao Luo
Keyword(s):  
Short Circuit ◽  
Time Domain Simulation ◽  
Subsynchronous Oscillation ◽  
Damping Coefficients ◽  
Torque Coefficient ◽  
Electrical Damping ◽  
The Time Domain ◽  
Generator Terminal ◽  
Short Circuit Fault ◽  
Signal Method

The methods for subsynchronous oscillation mitigation based on SVC and STATCOM are analyzed in this paper. According to the IEEE first benchmark model, the electrical damping coefficients respectively provided by SVC and STATCOM connected at the generator terminal, as well as positive damping condition, are deduced by complex torque coefficient approach. Correlative factors which influence the two positive dampings are compared. The analysis results indicate that the positive damping provided by SVC is proportional to the size of system voltage. The positive damping provided by STATCOM is not affected by the size of system voltage, which is mostly proportional to the subsynchronous voltage produced itself. The controllers of SVC and STATCOM are designed and the positive dampings separately offered by SVC and STATCOM are optimized by phase compensation with test signal method. The time domain simulation reveals that STATCOM has stronger damping ability than SVC in the case of short circuit fault.

Damping Analysis of Subsynchronous Oscillation Caused by HVDC

2013 ◽  
Vol 732-733 ◽  
pp. 1065-1068
Author(s):  
Shi Wu Xiao ◽  
Lan Lan Shu
Keyword(s):  
Time Domain ◽  
Test Signal ◽  
Subsynchronous Oscillation ◽  
High Voltage Direct Current ◽  
Damping Characteristics ◽  
Torque Coefficient ◽  
Machine Systems ◽  
Electrical Damping ◽  
The Time Domain ◽  
Signal Method

High Voltage Direct Current transmission (HVDC) will cause torsional interaction under certain conditions. Among a variety of factors, improper rectifier control has fateful effect. In the paper, the test signal method which is the time-domain form of the complex torque coefficient approach (CTC approach) is studied. Its application conditions in multi-machine systems are summarized. Using the test signal method, impacts of DC power, DC voltage, rectifier controller parameters and generator output on electrical damping characteristics in the Suizhong system are studied based on time-domain simulation model.

Damping Characteristics Analysis Based on Complex Torque Coefficient Method in Sub-Synchronous Oscillations

2014 ◽  
Vol 971-973 ◽  
pp. 988-991
Author(s):  
Han Chen ◽  
Chun Lin Guo
Keyword(s):  
Large Scale ◽  
Power Transmission ◽  
Test Method ◽  
Long Distance ◽  
Damping Characteristics ◽  
Torque Coefficient ◽  
Synchronous Oscillations ◽  
Electrical Damping ◽  
The Time Domain ◽  
Coefficient Method

Because of China's energy and load imbalance, large-scale long-distance power transmission becomes inevitable. Under this background , series compensation capacitor in the power system and HVDC developed rapidly, and the SSO (Sub-synchronous oscillations) caused by HVDC is becoming increasingly apparent. Fundamental reason of SSO lies in the sub-synchronous system negative damping characteristics, so it is necessary to analyze the system damping characteristics. The net system damping includes mechanical and electrical damping. Based on small-signal test method-complex torque coefficient method in the time-domain simulation , paper analyzed the system electrical damping and mechanical damping characteristics.

Analysis on Sub-Synchronous Damping Characteristic of VSC-HVDC

2013 ◽  
Vol 860-863 ◽  
pp. 2062-2067
Author(s):  
Ben Feng Gao ◽  
Jin Liu ◽  
Shu Qiang Zhao ◽  
Kun Xu
Keyword(s):  
Reactive Power ◽  
Power Level ◽  
Control Mode ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Interaction Factor ◽  
Torque Coefficient ◽  
Electrical Damping ◽  
The Impact ◽  
Coefficient Method

The study on the HVDC based on voltage-source converter focuses mainly on the control strategy while less on the impact of electrical damping on the adjacent units by VSC-HVDC. The mechanism of VSC-HVDC on inhibiting sub-synchronous oscillation is analyzed theoretically in the respect of its operation principle. Then the complex torque coefficient method realized by time domain simulation-the test signal method, is adopted to investigate the impact of the unit interaction factor, control mode, active power level and reactive power level on the electrical damping on the adjacent units.

scholarly journals The Complex Torque Coefficient Applied in Subsynchronous Oscillation Caused by HVDC

2019 ◽  
Vol 533 ◽  
pp. 012004
Author(s):  
Hanhua Zhang ◽  
Jiaqi Li ◽  
Jun Wen ◽  
Shuang Zhang ◽  
Bei Tian
Keyword(s):  
Subsynchronous Oscillation ◽  
Torque Coefficient

Improved Complex Torque Coefficient Method Using CPCM for Multi-Machine System SSR Analysis

2014 ◽  
Vol 29 (5) ◽  
pp. 2060-2068 ◽  
Author(s):  
Xinyao Zhu ◽  
Haishun Sun ◽  
Jinyu Wen ◽  
Shijie Cheng
Keyword(s):  
Machine System ◽  
Ssr Analysis ◽  
Torque Coefficient ◽  
Coefficient Method

Aplication of Quantitative and Qualitative Methods in Risk Management of Credit Portfolio in the Conditions of the Banking System of the Republic of Tajikistan

2013 ◽  
Vol 8 (3) ◽  
pp. 249-268
Author(s):  
Basgul Fajzullohonovna Isupova
Keyword(s):  
Risk Assessment ◽  
Risk Management ◽  
Qualitative Methods ◽  
Banking System ◽  
Potential Losses ◽  
The Republic ◽  
Credit Portfolio ◽  
Quantitative And Qualitative Methods ◽  
Coefficient Method

In this article, an analysis of the fundamental methods of risk assessment and risk management of credit portfolio is conducted. In particular, complex and qualitative methods of risk management of credit portfolio studied in details, namely analytical, statistical and coefficient methods. Based on the coefficient method the author proposes a number of standards for the assessment of potential losses in credit activity. 

Leadership Qualities and Business Skills Needed By Business Education Students in Public Universities in South-East Nigeria for National Security.

2019 ◽  
pp. 155-161
Author(s):  
Okwor N.G. ◽  
Ezeabii I.C.
Keyword(s):  
National Security ◽  
Business Education ◽  
Public Universities ◽  
Leadership Skills ◽  
Leadership Qualities ◽  
Education Students ◽  
Business Educators ◽  
Business Skills ◽  
Level Of Significance ◽  
Coefficient Method

The study focused on leadership qualities and business skills needed by business education students in public universities in South-East Nigeria for national security. Survey research design was adopted. Two research questions and two null hypotheses tested at .05 level of significance guided the study. The population for the study was 53 business educators (21 males and 32 females) in public universities in South East states of Nigeria. The number was manageable hence, there was no sampling. Structured questionnaire containing a total of 22 items was the instrument for data collection. The reliability of the instrument was determined using Cronbach Alpha reliability coefficient method. A correlation of .81 was obtained. Out of 53 copies of the questionnaire distributed, 52 copies were returned giving 98.11% return rate. It was found out that: ability to communicate( ̅ ), display honesty( ̅ ), solve problems( ̅ ) are among the leadership qualities and the ability to prepare budget( ̅ ), set procedures for achieving plans( ̅ ), make innovations( ̅ ) and use promotional tools( ̅ ) are among the business skills needed for by business education students for national security. Also, possession of leadership qualities and business skills are not gender biased. Recommendations made include: the identified leadership skills should be integrated in the curriculum by stakeholders for training business education students and business educators should ensure that the students are trained on the business skills identified to enable the students armed with salable skills and contribute to national security.

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