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首页> 外文期刊>IEEE Transactions on Industry Applications >Behavior of Protective Relays During Subsynchronous Resonance in Transmission Line and Adaptation of Generator Out-of-Step Protection
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Behavior of Protective Relays During Subsynchronous Resonance in Transmission Line and Adaptation of Generator Out-of-Step Protection

机译：输电线路次同步谐振期间保护继电器的行为及发电机失步保护的适应

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摘要

Subsynchronous resonance (SSR) is a phenomenon in which electrical energy is exchanged between the generator and the transmission system below power frequency. SSR occurs due to the interaction of a series-compensated transmission line with a generator. It results in shaft oscillation and out-of-step (OOS) condition. During SSR, the magnitude of voltage and current is increased. It also increases probable occurrence of ferroresonance. It is obviously clear that protective relays are affected in such conditions. In this article, Manitoba Hydro electrical network is examined with series capacitors by PSCAD/EMTDC to investigate the impact of SSR on the operation of different types of protective relays. SSR is mostly concerned with transmission lines. In addition, swing characteristic of impedance during SSR causes activation of the OOS blocking (OSB) element of distance relay and OOS protection of generator. Hence, an adaptive algorithm based on subharmonic measurement and ferroresonance analysis in the time domain is proposed for OOS characteristic of generator protective relay to recognize SSR condition and make a decision on behavior of the function. Finally, the algorithm is examined in SSR condition to certify the correct operation.
机译：次同步共振（SSR）是一种现象，在该现象下，发电机和传输系统之间的电能在低于工频的情况下进行交换。由于串联补偿传输线与发电机的相互作用，因此会发生SSR。这会导致轴振荡和失步（OOS）状态。在SSR期间，电压和电流的大小会增加。它还增加了铁磁谐振的可能性。显然，在这种情况下保护继电器会​​受到影响。在本文中，PSCAD / EMTDC用串联电容器对马尼托巴水电网络进行了研究，以研究SSR对不同类型的保护继电器的影响。 SSR主要与传输线有关。另外，SSR期间阻抗的摆动特性会导致距离继电器的OOS阻塞（OSB）元件激活，并导致发电机的OOS保护。因此，针对发电机保护继电器的OOS特性，提出了一种基于时域亚谐波测量和铁磁谐振分析的自适应算法，以识别发电机的SSR状态，并确定其功能。最后，在SSR条件下检查该算法以证明正确的操作。

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