适用于半波长线路的假同步差动保护

发布时间：2018-06-18 18:02

本文选题：半波长线路 + 假同步　；参考：《中国电机工程学报》2016年24期

【摘要】：由于半波长输电线路较长,常规的差动保护要经过通道传输时间延时动作,严重影响保护的速动性。该文提出一种适用于半波长线路的假同步差动保护,采用本侧数据与对侧一个周波前的数据进行同步,计算差动。假同步差动保护利用时差法估算故障点位置;以故障点为差动点,通过线路两端的电压、电流计算差动点两侧的电压、电流;以本侧电流和对侧一个周波前的电流分别计算到差动点处的电流进行差动,得到的差动电流作为分母,本侧电压计算到差动点处的电压作为分子,计算假同步差动阻抗,通过假同步差动阻抗的大小判断区内外故障。假同步差动保护由闭锁式、测距式和允许式假同步差动保护构成,分别对应保护线路的近段、中段和远段故障。在RTDS仿真软件上搭建半波长线路模型,对假同步差动保护进行仿真验证,结果表明假同步差动保护可以提高保护的动作速度,具有良好的动作性能。
[Abstract]:Because of the long half-wavelength transmission line, the conventional differential protection has to pass through the channel transmission time delay action, which seriously affects the protection's rapidness. In this paper, a pseudo-synchronous differential protection for half-wavelength lines is proposed. The local data is synchronized with the data in front of a Zhou Bo on the opposite side, and the differential is calculated. Pseudo synchronous differential protection uses time difference method to estimate the location of fault point, taking the fault point as differential point, calculates the voltage and current of both sides of the differential point through the voltage and current at both ends of the line. Using the local current and the current in front of a Zhou Bo on the opposite side to calculate the current at the differential point, the resulting differential current is used as the denominator, and the voltage at the local side voltage to the differential point is used as the molecule to calculate the pseudo-synchronous differential impedance. The fault inside and outside the region is judged by the magnitude of pseudo-synchronous differential impedance. The pseudo-synchronous differential protection consists of latch-up, lock-out and allowable pseudo-synchronous differential protection, corresponding to the fault of the near, middle and far sections of the protection line, respectively. The half-wavelength line model is built on RTDS simulation software, and the pseudo-synchronous differential protection is verified by simulation. The results show that the pseudo-synchronous differential protection can improve the operation speed of the protection and has good action performance.
【作者单位】：中国电力科学研究院;国网公司华中分部;国家电力调度控制中心;
【分类号】：TM773

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