CAJ | 학술논문

受输电走廊的制约，同塔双回直流线路已成为直流输电工程建设的发展趋势之一，然而由于同塔双回直流线路极线间的电磁耦合关系导致了其故障暂态特性极为复杂。行波保护作为直流线路主保护，故障行波特性的研究对其动作性能的分析至关重要。为此，基于无畸变线路模型研究了同塔双回直流线路故障电压电流的相模变换方法和模量求解方法；系统地分析了极线故障行波的特性及其与单回直流线路的差异性，以及实际同塔双回直流线路不对称换位和参数频变等影响因素；基于PSCAD/EMTDC电磁暂态仿真软件进行了分析验证。研究成果有助于对目前基于单极线电气量的直流线路行波保护动作性能的分析以及其在同塔双回直流线路上的适应性研究。
수수전주랑적제약，동탑쌍회직류선로이성위직류수전공정건설적발전추세지일，연이유우동탑쌍회직류선로겁선간적전자우합관계도치료기고장잠태특성겁위복잡。행파보호작위직류선로주보호，고장행파특성적연구대기동작성능적분석지관중요。위차，기우무기변선로모형연구료동탑쌍회직류선로고장전압전류적상모변환방법화모량구해방법；계통지분석료겁선고장행파적특성급기여단회직류선로적차이성，이급실제동탑쌍회직류선로불대칭환위화삼수빈변등영향인소；기우PSCAD/EMTDC전자잠태방진연건진행료분석험증。연구성과유조우대목전기우단겁선전기량적직류선로행파보호동작성능적분석이급기재동탑쌍회직류선로상적괄응성연구。
Owing to the shortage of transmission space, double-circuit HVDC on the same tower has been widely applied in the power construction. However, the electromagnetic coupling of different pole in two circuits makes the transient electrical characteristics complex when a fault occurs. The protection based on travelling-wave plays a main role in direct circuit protection, which makes great significance in the study of travelling-wave characteristics in double-circuit HVDC, so as to win the master of operating performance of line protection. As a result, based on the Bergeron line model, the method of phase-mode transformation and modulus calculation for line voltage and current when a fault happens in double-circuit HVDC is proposed firstly. Then the travelling wave characteristics in double-circuit HVDC and the difference from travelling-wave HVDC in single-circuit are analyzed systematically. After that, the influence factors of asymmetric transposition of transmission lines and frequency dependent parameter are taken into consideration. Finally, the theory is analyzed and verified in the platform of PSCAD/EMTDC. The results of this paper help to analyze the performance and the adaptability in double-circuit of the travelling wave protection based on single-pole electrical information.