Hardware-In-The-Loop Simulation of High Voltage Modular Multilevel Converter

Under the strategic goal of carbon peaking and carbon neutrality, it is urgent to build a new power system characterized by clean and low carbon, safe and controllable, flexible and efficient, intelligent and friendly, open and interactive. As the key equipment of flexible DC transmission, voltage source converter valve plays a very important role in the smooth operation of flexible DC transmission system. At present, domestic research mainly focuses on theory and engineering application, and there is little research on RTDS verification device. The valve control simulation verification device proposed and developed in this paper can simulate the basic functions of grid-connected operation and sequential control of the actual VSC-HVDC project on the RTDS system by combining the secondary complete sets of equipment such as main control device, coordinated control unit and monitoring system. At the same time, it has the ability of fault diagnosis and timely reporting and the ability of module voltage self-balancing, which can meet the hardware-in-the-loop simulation requirements of high-voltage modular multilevel converter. It is a key component of the verification platform required for dynamic characteristic analysis, fault feature extraction and engineering application of high-voltage VSC-HVDC system.