多端口电磁-机电暂态混合实时仿真接口技术与应用

建立混合仿真机电系统多端口接口等效电路模型,给出等值阻抗,求取及正、负序阻抗不等情况下的修正方法。详细分析多端口下混合仿真误差机理,在此基础上提出包括戴维南电动势预估、变步长交互等精度改善技术。采用端口解耦处理与基于自组织竞争神经网络的端口聚合方法,克服了端口数目增多带来的接口建模维数灾问题。基于RTDS实时仿真平台,设计了以RTDS/CBuilder自定义模块作为接口形式的多端口接口实现方案。最后,分别搭建了某区域电网验证系统与某地区含7回直流的复杂交直流电网应用系统,进行典型案例测试,对比全电磁仿真结果,验证了多端口接口模型与接口实现方案的可行性及有效性。

Multi-Port Interface Technique and Application of Electromagnetic and Electromechanical Transient Hybrid Real-Time Simulation

In this paper, the multi-port interface equivalent circuit model of the electromechanical system for hybrid real time simulation is proposed, and the external system equivalent impedance parameter extraction and its correction method in case of the unequal positive and negative sequence impedance are presented as well. The error mechanism in multi-port hybrid simulation is analyzed, then the advanced accuracy improvement techniques including the Thevenin voltage linear estimation and the varying-time step interaction methods are proposed. In order to overcome the 'dimension disaster' resulting from modelling the significantly increasing number of ports, the multi-port decoupling and self-organization competitive neural network based port clustering methods are employed. Further, the multi-port interface technique is implemented in RTDS using user-defined CBuilder blocks. Finally, the hybrid real time simulation test systems of a certain regional power network and a complex hybrid AC/DC system including seven HVDC links are used to test all the proposed approaches, the hybrid simulation results are compared with the electromagnetic transient model which validate the feasibility and effectiveness of the proposed solutions.