非同步机电源渗透率对同步机之间功角稳定性影响的简化模型分析

Simplified model analysis of influence of penetration rate of non-synchronous generatorsource on angle stability of synchronous generators

研究了非同步机电源接入电网对电网中原有同步机之间功角稳定性的影响。基于经典的单机-无穷大系统模型,设计了一个考虑输电通道中接入非同步机电源的简单测试系统,提出了研究非同步机电源渗透率对同步机之间功角稳定性影响的衡量基准。建立了简单测试系统的数学模型,采用同步功率系数作为衡量小扰动功角稳定性的指标;基于等面积法则分析测试系统的大扰动稳定性,并采用故障临界清除时间作为衡量大扰动功角稳定性的指标。研究结果表明,在设计的测试系统和所提衡量基准下,非同步机电源接入对原系统中同步机之间功角稳定性有改善作用。

The influence of non-synchronous generator source connected to power grid on the angle stability of synchronous generators in power systems is studied.Based on the classical single-machine infinite-bus system model,a simple test system considering the power supplied by the non-synchronous generator source connected to the transmission corridor is designed.A benchmark for studying the influence of penetration rate of non-synchronous generator on the angle stability of synchronous generators is proposed.The mathe⁃matical model of the simple test system is established,and the synchronizing power coefficient is used as the index to measure the small signal angle stability.The large signal stability of the test system is analyzed based on the equal area criterion,and the fault critical clearing time is used as the index to measure the large signal angle stability.The research results show that under the test system and the proposed bench⁃mark,the integration of non-synchronous generator sources can improve the angle stability of the synchro⁃nous generators in the original system.