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Impact of Sub Synchronous Resonance on operation of protective relays and prevention method

机译:副同步共振对保护继电器的影响及防治方法

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Synchronous Resonance (SSR) is a phenomenon in which electrical energy is exchanged between generators and transmission systems below power frequency. It can be caused due to interaction of a series compensated transmission line with a generator; in addition, results in oscillation in the shaft and power swing. SSR causes increasing the magnitudes of voltage and current consequently occurrence of ferroresonance. It is obviously clear that protective relays are affected in such conditions. Although SSR is damped by FACTS devices protective relays must be adaptive to prevent mal operation independently. In this paper, Manitoba Hydro electrical network with series capacitors is simulated to investigate impact of SSR on operation of overcurrent relay. Ferroresonance occurs in most SSR conditions. Hence, in order to distinguish protection of hydro generator against sub harmonics, which interact with natural frequencies of the rotor; in addition, increasing reliability and security of protection a logical SSR detection algorithm based on sub harmonic measurement and ferroresonance analysis in time domain is proposed for overcurrent relay and examined in the network.
机译:同步谐振(SSR)是一种现象,其中电能在功率频率以下的发电机和传输系统之间交换。由于串联补偿传输线与发电机的相互作用,可以引起;此外,导致轴和动力摆动中的振荡。 SSR导致增加电压和电流的幅度,因此发生了Ferroreonance。显然显然,保护继电器在这种情况下受到影响。虽然SSR被事实阻尼,但是设备保护继电器必须自适应,以防止单独操作。本文采用Manitoba Hydro电气网络,模拟了SSR对过电力继电器操作的影响。 Ferroreonance在大多数SSR条件下发生。因此,为了区分水力发电机对子谐波的保护,其与转子的固有频率相互作用;此外,提高了基于副谐波测量和时域的逻辑SSR检测算法的逻辑SSR检测算法,以用于过电流中继并在网络中检查。

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