Title :
Study on Thevenin equivalent model and algorithm of AC/DC power systems for voltage instability identification
Author :
Jianwei Zhao ; Zheng Yan ; Lu Cao ; Jianhua Li
Author_Institution :
Dept. of Electr. Eng., Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
Thevenin equivalent circuit, providing a simple and feasible way to get the maximum transmission power to a load, is widely used in traditional ac systems for voltage instability identification. This paper makes some further study on this methodology with the consideration of high voltage direct current (HVDC) links. At first, an HVDC equivalent circuit founded on quasi steady-state (QSS) model is proposed, which can be used extensively in steady-state analysis and long-term stability analysis. On this basis, Thevenin equivalent algorithms of AC/DC systems are discussed. In order to evade the difficulties and drawbacks of the existing Thevenin equivalent parameters estimating techniques, this paper brings forward a new algorithm called generalized Thevenin equivalent method. Then the calculation procedure based on time domain simulation tool is given clearly. In the end, case studies are made to validate the effectiveness of the proposed HVDC equivalent model and generalized Thevenin equivalent algorithm in voltage instability detection.
Keywords :
HVDC power transmission; equivalent circuits; power system stability; time-domain analysis; AC-DC power systems; HVDC equivalent circuit; HVDC equivalent model; HVDC links; QSS model; Thevenin equivalent algorithms; Thevenin equivalent circuit; Thevenin equivalent method; Thevenin equivalent model; high voltage direct current links; quasisteady-state model; stability analysis; steady-state analysis; time domain simulation tool; transmission power; voltage instability detection; voltage instability identification; Equivalent circuits; HVDC transmission; Impedance; Integrated circuit modeling; Load modeling; Power system stability; Stability analysis; HVDC; Thevenin equivalent; time domain simulation; voltage instability identification;
Conference_Titel :
Power System Technology (POWERCON), 2014 International Conference on
Conference_Location :
Chengdu
DOI :
10.1109/POWERCON.2014.6993794