高比例风电并网系统次同步振荡的广域监测与分析

Wide-area Monitoring and Analysis of Subsynchronous Oscillation in Power Systems With High-penetration of Wind Power

现代电网中基于电力电子接口的新能源比例逐年提高,电力电子设备与电网之间相互作用引起的次同步振荡问题也日益突出。广域监测系统可实时获取次同步振荡的数据,为次同步振荡的在线分析和预警提供了重要手段。该文针对基于数据驱动的新能源并网系统中次同步振荡实时分析,构建了次同步振荡广域监测系统的基本构架,该系统主要由次同步相量监测装置和次同步振荡分析中心构成。进一步,基于实时监测数据和聚合阻抗模型相结合的方法,提出次同步振荡稳定性评估指标及振荡溯源方法,能够快速准确地实现次同步振荡的在线监测与预警。通过我国实际电网的电磁暂态仿真模型,验证了所提次同步振荡广域监测系统的有效性。

In modern power grids, since large-scale grid connection of renewables is based on power electronic interface, the subsynchronous oscillation resulting from the interaction between power electronics and power grid becomes increasingly prominent. The wide-area monitoring system can obtain real-time data of sub-synchronous oscillations, which provides an important means for online analysis and early warning of sub-synchronous oscillations. In this paper, the basic framework of the subsynchronous wide-area monitoring system(SWAMS) was proposed to measure and analysis the subsynchronous oscillation. SWAMS was mainly composed of subsynchronous phasor measurement units(SPMU) and the subsynchronous oscillation analyzing center. Further, based on the combination of real-time monitoring data and aggregate impedance model, the stability evaluation methods and oscillation source-identifying were proposed. It can quickly and accurately realize online monitoring and early warning of subsynchronous oscillations. The effectiveness of SWAMS was verified by the simulation data collected from the electromagnetic transient simulation of a practical power grid of China.