基于扩展等面积准则的电力系统动态安全域

Dynamic Security Regions of Electric Power System Based on Extended Equal-area Criterion

基于扩展等面积准则(EEAC)的量化能力,该文提出一种新的构建电力系统参数空间中动态安全域(DSR)的方法。该方法从初始运行点出发,通过迭代确定系统失稳模式随参数变化的情况。对每一种潜在的失稳模式,搜索其动态安全域边界上的一个点,根据临界点处的法向来求解用于模拟动态安全域边界的超平面。考虑到临界点处法向对系统的某些参数比较敏感,该文还导出临界点处与法向平行的参数灵敏度向量,用以代替临界点处的法向。对于当前运行点,通过寻找该点的参数改变方向与各临界点处的参数改变方向的夹角的最小值来确定匹配的模式,从而根据该模式的超平面系数来判断运行点的稳定性。最后在8机32节点的系统上对所提出的方法进行验证。

Based on the quantizing ability of extended equal-area criterion（EEAC）, a new method to build a dynamic security region（DSR） of electric power system in parameter space was proposed. From the initial operating point, this method searched the new instability modes with the change of parameters by the way of iteration. For each potential instability mode, a critical point on the boundary of the security region was found, in which the normal vector was used to form the hyperplane to simulate the boundary of the security region. Considering that the normal vector in the critical point was very sensitive to some power system operation parameters, a vector of parameter sensitivity was derived which was parallel to the normal vector to substitute it. For the actual operating point, the minimum inclination between the change direction of parameters of operating point and all of the critical points was computed. The corresponding mode and its hyperplane coefficients were used to estimate stability of the actual operating point. Finally a system with 8 generators and 32 buses was used to proof the validity of the method presented.