REI法在动态等值中的应用与改进

为简化大规模电力系统离线暂态稳定分析时所用同调等值法所作的动态等值过程,将静态等值常用的REI等值法的思想应用于同调等值过程,把同调发电机、负荷看作与外部系统传输功率方向相反的有源节点,用相同方法对其合并化简,并用最小二乘法优化等值网络线路参数。网络潮流的PSASP计算结果表明,联络线上传输功率等值前后误差很小,满足网络等值要求。该法有很好的准确性,并已应用于华中电网稳定性控制的研究中。

Application and Amelioration of REI in the Dynamic Equivalence

When analyzing the off-line transient stability of large scale power system, the dynamic equivalence method is coherency-based equivalence. If the point of the outer system in the REI equivalence is classified according to generator and load, the process is similar to the coherency-based equivalence. To predigest the process of equivalence, using the idea of REI equivalence to the process of coherency-based equivalence, taking the coherency-based generator and load as the reverse transferring power source-point, using the same method to incorporate them, and using the least-squares estimation to optimize the line-parameter of equivalence-net. From the load flow result by PSASP, the error of transient power on the connecting-line is little, fill with the request of net-equivalence. So the method has good veracity and has been used to the stability-controlling research of Huazhong network.