CAJ | 학술논문

连接电气系统的多导体传输线在电偶极子激励下的瞬态电磁响应分析是开展电力系统电磁干扰防护工作的基础。本文将复频域形式的BLT（Baum-Liu-Tesche）电流方程分解为电偶极子电磁场等效分布电压源与负载端电压两部分激励产生的响应之和,在此基础上利用拉普拉斯反变换得到了线性多导体传输线的时域终端电压-电流关系式,并将传输线的初始条件等效为线上的分布激励源,计及了由传输线初始状态产生的零输入响应。与数值算法结果的对比验证了所提出的传输线时域终端电压-电流关系式。最后,通过一个交直流供电系统计算例,说明了本文给出的方法可有效地计算外部电磁场与电气系统中多导体传输线的电磁耦合问题。
련접전기계통적다도체전수선재전우겁자격려하적순태전자향응분석시개전전력계통전자간우방호공작적기출。본문장복빈역형식적BLT（Baum-Liu-Tesche）전류방정분해위전우겁자전자장등효분포전압원여부재단전압량부분격려산생적향응지화,재차기출상이용랍보랍사반변환득도료선성다도체전수선적시역종단전압-전류관계식,병장전수선적초시조건등효위선상적분포격려원,계급료유전수선초시상태산생적령수입향응。여수치산법결과적대비험증료소제출적전수선시역종단전압-전류관계식。최후,통과일개교직류공전계통계산례,설명료본문급출적방법가유효지계산외부전자장여전기계통중다도체전수선적전자우합문제。
Analysis of the transient electromagnetic response of the multiconductor transmission line in an electrical system excited by an electric dipole is fundamental to protection of power systems against electromagnetic interference.The current Baum-Liu-Tesche（BLT） equation in the complex frequency domain is divided into two parts representing the responses excited separately by the terminal voltages of the loads and the distributed voltage sources produced by the electric dipole,and the time-domain relation of the terminal voltage and current of the transmission line is derived by inverse Laplace transform.Furthermore,the initial conditions of the transmission line are converted to the distributed sources along the line,so the zero-input response produced by the initial state of the line can be analyzed.The derived time-domain relation of the terminal voltage and current of the line is verified by the results comparison with the numerical method.By an illustration of an AC-DC power system,it is shown that the method proposed in the paper can be used to efficiently calculate the electromagnetic coupling problem of an external electromagnetic field and the multiconductor transmission line in an electrical system.