CAJ | 학술논문

综合考虑了故障阻抗的随机性和不同绕组联接方式的多级变压器对凹陷评估的影响.建立了故障阻抗的随机分布模型和多级变压器的等效移相矩阵,对考虑2个方面影响因素后的电压凹陷幅值与频次评估的数学模型、算法和步骤进行了详细研究.对简单9节点系统和IEEE 30节点系统进行了仿真分析,结果证明,变压器绕组联接方式对电压凹陷幅值和频次均有影响,故障阻抗对电压凹陷幅值有明显影响,与现有评估方法进行比较,评估结果准确,原理简单,适用于任意规模与结构形式的电网.
종합고필료고장조항적수궤성화불동요조련접방식적다급변압기대요함평고적영향.건립료고장조항적수궤분포모형화다급변압기적등효이상구진,대고필2개방면영향인소후적전압요함폭치여빈차평고적수학모형、산법화보취진행료상세연구.대간단9절점계통화IEEE 30절점계통진행료방진분석,결과증명,변압기요조련접방식대전압요함폭치화빈차균유영향,고장조항대전압요함폭치유명현영향,여현유평고방법진행비교,평고결과준학,원리간단,괄용우임의규모여결구형식적전망.
The influences of the fault impedance randomicity and the cascaded transformers with different connection modes on the voltage sag assessment are studied.The stochastic probability model of fault impedance and the equivalent phase shift matrix of cascaded transformers are proposed.The mathematic models,arithmetic and approaches of voltage sag magnitude and frequency assessment are researched with the consideration of both influences.Simulative analysis is carried out for 9-node network and IEEE-30 test system,which shows that,the transformer connection mode has influence on both voltage sag magnitude and frequency while fault impedance has obvious influence on voltage sag magnitude.Compared with exiting methods,the proposed method is simple and accurate,suitable for power system of any scale and structure.