机电暂态-电磁暂态混合仿真接口技术

Interface Techniques of TSP/EMTP Hybrid Simulation

提出电力系统仿真的机电暂态-电磁暂态混合仿真接口技术.根据研究的详细程度,将电网划分为内部电磁网络、外部机电网络和接口母线.应用Ward等值法化简外部网络,其特色是发电机与网络连接应用统一电路模型.最后得到的电磁仿真的接口电路模型,其电源的频率、相角和幅值在仿真中都是变化的.通过改进最小二乘法和对称分量法处理内部网络的电磁仿真结果,形成对应机电仿真的恒功率阻抗模型.该接口技术降低了网络的维数,提高了仿真的效率.在含有变电站的IEEE-9节点系统上进行仿真,其与商业软件PSCAD的比对结果验证了算法的正确性和有效性.

Hybrid simulation interface technique of digital simulation power system was proposed in this paper, which combined transient simulation program （TSP） and electromagnetic transient program （EMTP）. Power grid was divided into external network, internal network and interface bus according to the importance of research. Three-phase Thevenin equivalent circuit model was adopted for external network in the EMTP simulation by Ward equivalent method with uniform generator models, where the frequency, angle and amplitude of the source were time-variant. The constant power impedance model for the TSP simulation was computed with the EMTP simulation results of internal network by an improved least squares method and symmetrical component method. With the interface techniques, the network dimensions of the EMTP simulation were reduced, therefore effectiveness of fault simulation is greatly en- hanced. The accuracy of the new techniques is verified through comparison of the simulation results obtained by com- mercial software PSCAD and these of the IEEE-9 bus system containing a substation.