基于映射广义弹性系数的电网静态稳定快速评估判据

Rapid Quantitative Method for Power System Static Stability Assessment Based on Mapping General Elastic Coefficient

直接利用广域量测信息实现电网静态稳定快速量化评估是提高大电网在线监控和预警能力的关键。竺炜教授借鉴运动力学空间中静态稳定的物理概念,首次将电力系统全映射到弹性力学空间,为基于响应的大电网在线稳定态势量化评估提供了新的视角。该文在此基础上,区别于常规的电网等效建模方法,依据映射弹性势能及实时量测信息,将电网等效成一条虚拟的"源网荷"弹性支路,并提出一种电网静态稳定性能快速量化评估判据,即广义弹性系数。在新英格兰10机39节点系统和某省级电网中的仿真结果验证了所提方法的可行性。该方法直接利用量测信息进行简单的数值计算,避免了各类等效参数辨识环节及不确定因素,具有较大的工程应用价值。

It is the key to improve the online monitoring and early-warning of large grid that using wide-area measurement system（WAMS） to achieve rapid quantitative assessment of static grid. The whole power system was mapped to the elastic mechanics space by professor ZHU Wei reference from the physical concept of static stability in kinetics space, which provides a new perspective for the quantitative evaluation of large power grid online based on response. Different from the traditional power grid equivalent modeling method,the large power grid was projected onto an elastic dynamic field in this article,according to the real-time data of WAMS and elasticity potential energy. The large power grid was equivalent to an elastic branch with the media of a branch elastic potential energy. Thus,this paper presented a power system static stability fast quantitative performance evaluation criterion, namely the general elastic coefficient. The proposed method was verified to be feasible under the Case study on the 10-machine 39-bus New England test power system and a provincial power grid. This method directly uses the measured information of simple numerical calculation, to avoid all kinds of parameter identification link equivalent and uncertain factors, which has great engineering application value.