Assessment and Enhancement of Small Signal Stability Considering Uncertainties
Assessment and Enhancement of Small Signal Stability Considering Uncertainties
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DOI：
10.1109/tpwrs.2008.2009428
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发表时间：
2009-01
影响因子：
6.6
通讯作者：
J. Rueda;D. G. Colomé;I. Erlich
中科院分区：
文献类型：
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作者：
J. Rueda;D. G. Colomé;I. Erlich
通过对小干扰稳定性（SSS）的模态分析，提出了一种基于蒙特卡罗迭代评估方法的概率小干扰稳定性评估（PSSSA）方法。分析了由发电量和需求量随机值表示的运行状态。计算了基于振荡模态阻尼比累积概率分布函数的概率失稳风险指标，以及基于特征向量和参与因子的电力系统稳定器（PSS）装置位置指标。此外，长距离功率流的振荡模式（OM）的影响，以及如何阻尼OM取决于功率流的方向和幅度进行了研究。此外，一个额外的指标涉及定性确定传输能力的影响，小信号稳定性。PSSSA的新英格兰-新约克的互联系统的降阶模型进行测试，分别考虑周围三个不同的系统条件的不确定性：高负荷，相当负荷，低负荷。结果突出了PSSSA的主要优势，确定性SSS的研究，如不稳定风险评估，小信号稳定性增强，通过适当的PSS位置，并建议可能的限制传输能力，以避免不良阻尼振荡，在面对电力系统运行的多样性。
This paper proposes a probabilistic small signal stability assessment (PSSSA) methodology based on the application of Monte Carlo approach for iterative evaluation, via modal analysis of small signal stability (SSS). Operation states represented by random values of generation and demand are analyzed. A probabilistic instability risk index based on cumulative probability distribution function of damping ratios of oscillatory modes is calculated, as well as a power system stabilizer (PSS) devices location index based on eigenvectors and participation factors, which are considered random variables. Moreover, the impact of long-distance power flows on oscillatory modes (OM) and how the damping of OM depends on the orientation and magnitude of power flows is investigated. Further, an additional index concerns qualitatively the determination of transfer capability as affected by small signal stability. PSSSA is tested on a reduced order model of New England-New York's interconnected system considering uncertainties around three different system conditions separately: highly loaded, fairly loaded, and lowly loaded. The results highlight the main advantages of PSSSA over deterministic SSS studies such as instability risk assessment, small signal stability enhancement through adequate PSS location, and the proposal of possible restrictions for transfer capability in order to avoid poorly damped oscillations in the face of the diversity in power system operation.