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Dynamic single machine equivalent techniques for on-line transient stability assessment

机译:动态单机等效技术,用于在线暂态稳定性评估

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摘要

According to the post-fault trajectory duration characteristics, power system disturbances, which may cause transient stability problems, are classified into three types: short, long and extremely long duration ones. An improved method using dynamic single machine equivalent system (SMES) model for on-line first swing critical clearing time (CCT) estimation for both short and long duration disturbances on multi-machine power systems is developed in this paper. This dynamic SMES model substitutes for a large power system to provide fast, on-line transient stability assessment (TSA). Techniques such as assessment of energy margin, identification of a group of machines called the 'dominant critical machines' and an interpolation formula for CCT evaluation are proposed in this method to achieve high speed and accuracy in TSA. Test results on real size power systems are reported to show that the method is reliable for CCT assessment of both short and long post-fault duration disturbances.
机译:根据故障后的轨迹持续时间特性,可能会引起暂态稳定问题的电力系统干扰分为三种:短持续时间,长持续时间和极长持续时间。本文提出了一种改进的方法,该方法利用动态单机等效系统(SMES)模型对多机电力系统的短期和长期扰动进行在线首次摆动临界清除时间(CCT)估计。该动态SMES模型替代了大型电源系统,可提供快速的在线瞬态稳定性评估(TSA)。该方法提出了诸如能量裕度评估,识别一组机器(称为“主要关键机器”)以及用于CCT评估的插值公式等技术,以实现TSA的高速和高精度。据报道,在实际规模的电力系统上的测试结果表明,该方法对于故障前后持续时间长短干扰的CCT评估都是可靠的。

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