| Title |
Algorithm Development for Improving Output Characteristics of Thyristor Dual Converter with AC Input Voltage Variation |
| Authors |
김성안(Kim, Sung-An) ; 한성우(Han, Sung-Woo) ; 조윤현(Cho, Yun-Hyun) |
| DOI |
https://doi.org/10.5370/KIEE.2017.66.9.1437 |
| Keywords |
Thyristor dual converter ; Initial firing angle ; AC input voltage variation ; Voltage control ; Forward/reverse mode |
| Abstract |
Electric energy is consumed or regenerated according to an operation of electric rail cars in urban railway power substations. A thyristor dual converter system is used to deal with the electric energy. Since the AC input voltage of power substations is 22.9kVpm10%, the magnitude of the AC voltage fluctuates according to load conditions, so the secondary side voltage of the DDY transformer also fluctuates. In the thyristor dual converter, the response characteristics of the DC output voltage and the DC output current are changed based on an initial firing angle in the cross mode conversion between the forward mode and the reverse mode. Therefore, this paper proposes the initial firing angle tracking algorithm considering fluctuation of the AC input voltage. The effectiveness of the proposed algorithm is verified by a simulation compared with the conventional algorithm. |