电力系统近共振振荡的扩展Prony分析
Extended Prony Analysis on Power System Oscillation Under a Near-Resonance Condition
摘要：
电力系统在大扰动下的振荡往往表现出畸变的波形，这是由越来越多地部署的相量测量单元捕获的。其中一个原因是发生近共振的情况下，由发电机的非线性瞬态动力学的影响的几个主导模式。本文提出了一种基于测量的模态分析的扩展Prony分析方法。该方法基于规范形理论，通过对瞬态和瞬态后波形的分析比较，将由近共振条件引起的共振模态从固有模态中区分出来，从而比传统的Prony分析方法给出更精确的模态特性，尤其是对于大扰动。新方法首先详细演示了Kundur的两个区域系统，然后在IEEE 39节点系统上进行测试，以显示其在近共振条件下的性能。
英文摘要：
Power system oscillations under a large disturbance often exhibit distorted waveforms as captured by increasingly deployed phasor measurement units. One cause is the occurrence of a near-resonance condition among several dominant modes that are influenced by nonlinear transient dynamics of generators. This paper proposes an Extended Prony Analysis method for measurement-based modal analysis. Based on the normal form theory, it compares analyses on transient and post-transient waveforms to distinguish a resonance mode caused by a near-resonance condition from natural modes so that the method can give more accurate modal properties than a traditional Prony Analysis method, especially for large disturbances. The new method is first demonstrated in detail on Kundur's two-area system and then tested on the IEEE 39-bus system to show its performance under a near-resonance condition.
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