【摘要】 以抑制现代化港口供配电系统产生的电压闪变与振荡为目的,分析了电缆分布电容对系统的影响。港口供配电系统中敷设了大量的电力电缆,并大多采用了的具有能量回馈的变频调速技术,不可避免的产生了大量的谐波,文中主要研究电力电缆分布电容对谐波源在二次侧系统的谐波放大作用。通过电路的基本理论分析了港口供配电系统中电缆分布电容与系统谐波之间的相互影响。分析表明电缆分布电容在不同条件下会对系统谐波起到放大、抑制或滤除等不同影响,最后用计算机仿真验证了理论分析的正确性。更多还原

【Abstract】 In order to suppress the voltage fluctuation and oscillation in modern port power distribution system,this paper analyzed the effect of power cable distributed capacitance towards the system. The power distribution system lays lots of power cable,and mainly uses variable velocity variable frequency technology with power energy feedback in modern ports,which generated much harmonics. The paper mainly researches on harmonics amplification caused by distributed capacitance of power cable when harmonics are generated on secondary side. It analyzes the mutual influence between system harmonic and distributed capacitance of power cable by way of basic theory of electric circuit. It shows through the analysis that the power cable distributed capacitance has different influence such as enlargement,suppression or filtering etc on system harmonic, finally the theory is verified by PSCAD/EMTDC simulation.更多还原