A hybrid real-time simulation platform with digital and physical subsystems is proposed for the MMC-HVDC (Modular Multilevel Converter based HVDC). Its system structure,equivalent principle and simulation ratio calculation are introduced, as well as its first application in engineering development. Composed of the digital system model,49-level MMC physical simulation device,digital-analog communication interface,it carries out the total functional simulation in real time to verify the actual VBC (Valve Based Controller) and converter PCP(Pole Control Protection) system. It is applied to the fault state simulation of Shanghai Nanhui HVDC pilot project and the simulative results are compared with the test results by PSCAD,which proves the effectiveness of the introduced platform in the online real-time verification of the dynamic performance and control-protection platform of MMC-HVDC.%针对基于模块化多电平换流器的柔性直流输电(MMC-HVDC),提出了基于数字-模拟混合建模的实时仿真平台,介绍了其系统构成、等效原理、模拟比计算原则及其在我国首套工程开发中的应用.该平台包括相应的数字化系统模型、49电平MMC物理模拟装置、数字和模拟仿真平台接口,能够完成对实际工程中的换流阀阀基电子控制器(VBC)和换流站极控制保护(PCP)系统进行实时的全功能仿真验证.通过对上海南汇柔性直流输电示范工程进行故障态仿真,得出了相应的试验结果,并与电磁暂态仿真软件PSCAD的仿真结果进行了对比,证明了该系统为MMC-HVDC的动态特性和控制保护平台提供实时在线验证的有效性.
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