次同步振荡误差评估与建模

SSO Error Assessment and Its Modeling

次同步振荡传统建模方法不能确保所建立的模型分析结果能够满足工程实际的精度需求。本文基于39节点算例模型研究了不同建模规模和负荷模型两类因素对次同步振荡的作用,发现不同负荷模型和建模规模均会导致次同步振荡模态发生变化。本文考虑到上述两类因素是导致次同步振荡传统建模误差较大的本质原因,提出通过逐渐扩大区域的误差指标迭代来建立合适的系统次同步振荡模型。最后,应用算例模型评估了传统建模方法误差,验证了该方法的有效性。

The previous modeling method for subsynchronous resonance（SSR） cannot ensure that the established model meet the precision of engineering requirements. This paper investigates the effects on subsynchronous oscillation of modeling scale and load model by using the modified IEEE39 Bus system, which find that different load models and modeling size can lead to changes of subsynchronous oscillation mode. Taking into account the two factors are the essential reasons for the error of the traditional modeling of subsynchronous oscillation, a new method is presented to modeling the SSO model by enlarging step by step the scales of the extracted model. Finally, by using the example model, the errors of previous modeling method are assessed, and the proposed new modeling method for SSO is validated.