CAJ | 학술논문

为了量化特高压直流（UHVDC）系统可靠性及其参数灵敏度，提出了可靠性分层等值模型和改进频率和持续时间（F&D）算法。基于UHVDC系统结构和运行特点，计及多容量水平、换流变压器接线形式和单端整体备用模式，将其划分若干个子系统，分别建立状态空间，逐层向上等值，得到整个系统状态空间。传统F&D法需人工查找和计算等值转移频率后才可计算出等值转移率，易出错且计算量随着状态空间维数增加。基于矩阵描述的改进F&D算法，可直接建立等值前后转移率矩阵关系，以及系统可靠性指标对底层元件可靠性参数的灵敏度分解关系。算例分析结果表明，所提模型和算法能够定量评估UHVDC系统可靠性，明确了影响UHVDC可靠性的关键参数和薄弱环节，证实了方法的可行性与有效性。
위료양화특고압직류（UHVDC）계통가고성급기삼수령민도，제출료가고성분층등치모형화개진빈솔화지속시간（F&D）산법。기우UHVDC계통결구화운행특점，계급다용량수평、환류변압기접선형식화단단정체비용모식，장기화분약간개자계통，분별건립상태공간，축층향상등치，득도정개계통상태공간。전통F&D법수인공사조화계산등치전이빈솔후재가계산출등치전이솔，역출착차계산량수착상태공간유수증가。기우구진묘술적개진F&D산법，가직접건립등치전후전이솔구진관계，이급계통가고성지표대저층원건가고성삼수적령민도분해관계。산례분석결과표명，소제모형화산법능구정량평고UHVDC계통가고성，명학료영향UHVDC가고성적관건삼수화박약배절，증실료방법적가행성여유효성。
To quantify reliability and parametric sensitivity of the ultra HVDC (UHVDC) system, hierarchical models for reliability equivalent and improved F&D method are newly proposed. Based on the system configuration and the operation characteristics, multiple capacity levels, transformer winding connections, and single station sharing spare are considered. The UHVDC system is classified to several sub-systems, whose state spaces are derived and combined to yield the whole state space. The traditional frequency and duration (F&D) method necessitates manual search and calculating transition frequency to acquire transition rate, which is fallible, and the calculation efforts increases with the states. Improved F&D method based on matrix description yields relation of the transition matrices before and after equivalence. Sensitivity between system reliability indices and components’ reliability parameters is finally derived. Numerical results show that the proposed model and algorithm can quantify the reliability of UHVDC system and determine the critical parameter and weak component to unavailability of UHVDC system, which validates feasibility and effectiveness of the proposed model and algorithm.