| Title |
Direct Energy Method of Power System Stability Analysis and its Application by using Energy Conservation Law |
| Authors |
이용훈(Lee, Yong-Hoon) ; 조병훈(Cho, Byoung-Hoon) ; 류헌수(Ryu, Heon-Su) ; 문영현(Moon, Young-Hyun) |
| Keywords |
power system stability ; direct energy method ; multimachine system energy function ; complex integral approach ; energy integral ; energy conservation law |
| Abstract |
Many papers have recently been presented to develop energy functions for power systems. However, earlier studies adopted case-by-case approaches, which failed to give a general approach to deal with various kinds of generator models. In this paper, two useful theorems are developed regarding the integral relationships of the generator power versus its phasor current and voltage. By using the proposed theorems, an exact energy conservation law can be derived from the complex integral. The proposed energy conservation law, which is free of the generator model, can be utilized to develop energy functions for various kinds of generator models including the speed governors and exciters. An illustrative example is given for a multimachine system with the Eq' model of generator. This thesis also shows a possibility of more accurate and fast stability analysis by using the proposed Energy Conservation Law. |