XIA Chengjun
School of Electric Power, South China University of Technology, Guangzhou 510641, ChinaLIU Zhijiang
School of Electric Power, South China University of Technology, Guangzhou 510641, ChinaDU Zhaobin
School of Electric Power, South China University of Technology, Guangzhou 510641, Chinasupported by the National Natural Science Foundation of China (51577071) and Guangdong Natural Science Foundation (2015 A030313202)
In view of the existing control strategy of MMC-HVDC cannot guarantee the robustness,stability and fastness of the control system,a variable target control strategy is proposed.It divided the target value into multiple small targets,so that the system quickly reaches the target step by step without overshoot.Moreover,the setting principle of the PI parameter of the MMC-HVDC control system with variable target control and the setting method of the variable target control time are put forward.Finally,a three-terminal MMC-HVDC is built and simulated with PSCAD/EMTDC.The result of simulation demonstrates that the variable target control strategy can overcome the paradox between adjusting speed and overshoot,and the PI control unit parameter setting range is expand.The results clearly verifies enhancement in the robustness and adaptability of the system.
