功率连接型数模混合仿真结合了物理模拟仿真和实时数字仿真的优点,成为复杂电力系统研究分析的关键手段,功率接口算法是其关键技术。为此,提出一种适用于模块化多电平换流器高压直流输电系统数模混合仿真的功率接口算法。利用Routh稳定判据得出功率接口稳定运行的必要条件,提出换流变置于物理侧,同时引入反馈电流滤波器提高系统的稳定性。在PSCAD/EMTDC中构建基于理想变压器法的双端高压直流输电数模混合仿真系统,验证了该接口算法的稳定性和精确性。

Power hardware-in-the-loop simulation combines the advantages of physical simulation and real time digital simulation,becoming the key means to study and analyze the complex power system gradually.Power interface algorithm is the key technology of the simulation.In this paper,a power interface algorithm is presented for power hardware-in-the-loop simulation of MMC-HVDC.The necessary condition for the stable operation of the power interface is derived by using the Routh stability criterion,and the improvement measures are put forward to improve the stability by putting converter transformer in the physical side and introducing the feedback current filter.The power hardware-in-the-loop simulation system based on ITM is built in PSCAD/EMTDC,The stability of the algorithm is verified,and the simulation accuracy of the hybrid system and reference system is compared by the results of digital simulation.The simulation analysis shows that the algorithm has good performance of stability and accuracy.