一种基于电网WEB准实时数据的静态安全分析方法

A Novel Analysis Method of Quasi Real-time Data Static Security Based on WEB Services

提出一种基于补偿一灵敏度法的电网在线静态安全分析的新方法。该方法首先利用WEB技术获取电网准实时数据用于在线静态安全分析计算;其次为满足电网在线静态安全分析实时性的要求,在电网故障开断后潮流计算过程中引入补偿一灵敏度法。补偿一灵敏度法将故障前电网潮流方程线性化,可推导出支路潮流对节点注入功率的灵敏度,再依据戴维南定理,计算出支路开断后的线路关联节点的注入功率,然后利用节点问支路潮流灵敏度大小及节点注入功率变化,通过线性代数运算即可求得故障后的系统潮流,继而根据潮流结果完成线路潮流过载的筛选校验。最后采用EPRI 36节点系统验证了本文所提出方法的有效性。

A new method that could be used in on-line static security analysis is introduced. Firstly, WEB Services are used to access to power grid real-time data. Then a novel algorithm is proposed on the basis of compensation-sensitivity,with which to figure out power flow quickly since contingence occurs. And that could fulfill real-time requirements as real analysis demands. Compensation-sensitivity method can make power network equations linearization before the fault, derive the sensitivity of branch current upon node power injection, and calculate the injected power of associated node after line outage based on Thevenin theorem. Power flow with both sensitivity and power injection of associated nodes can be obtained when the fault happens. Besides, screening check of overload lines is completed according to the results of fault flow. Finally take the EPRI36 bus system for instance to prove the feasibility and effectiveness of the new method.