The Application of Complex Torque Coefficient Method in Multi-generator System

Author(s):  
Kun Xu ◽  
Chengyong Zhao ◽  
Jie Zhang ◽  
Chunlin Guo
2014 ◽  
Vol 971-973 ◽  
pp. 988-991
Author(s):  
Han Chen ◽  
Chun Lin Guo

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.


2013 ◽  
Vol 860-863 ◽  
pp. 2062-2067
Author(s):  
Ben Feng Gao ◽  
Jin Liu ◽  
Shu Qiang Zhao ◽  
Kun Xu

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.


2014 ◽  
Vol 29 (5) ◽  
pp. 2060-2068 ◽  
Author(s):  
Xinyao Zhu ◽  
Haishun Sun ◽  
Jinyu Wen ◽  
Shijie Cheng

2013 ◽  
Vol 8 (3) ◽  
pp. 249-268
Author(s):  
Basgul Fajzullohonovna Isupova

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. 


2019 ◽  
pp. 155-161
Author(s):  
Okwor N.G. ◽  
Ezeabii I.C.

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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