LI Xiaodong,XU Zheng,HU Siquan,et al.Comparison of AC fault characteristics among three types of hybrid HVDC system[J].Electric Power Automation Equipment,2019,39(09):228-235.
LI Xiaodong,XU Zheng,HU Siquan,et al.Comparison of AC fault characteristics among three types of hybrid HVDC system[J].Electric Power Automation Equipment,2019,39(09):228-235.DOI: 10.16081/j.epae.201909051.
Comparison of AC fault characteristics among three types of hybrid HVDC system
Considering the advantages of LCC(Line Commutated Converter) and MMC(Modular Multilevel Converter),and aiming at the actual scenario of China’s West-East Power Transmission Project,the follo-wing three types of hybrid HVDC(High Voltage Direct Current) system scheme are studied,which are currently of great application value. In Scheme 1,the sending end adopts LCC and the receiving end adopts half-bridge sub-module MMC with series diode valve;in Scheme 2,the sending end adopts LCC and the receiving end adopts the hybrid MMC composed of full-bridge sub-modules and half-bridge sub-modules;in Scheme 3,the sending end adopts LCC and the receiving end adopts the hybrid converter composed of LCC and half-bridge sub-module MMC in series. Firstly,the topological structure,mathematical model and control mode of three types of hybrid HVDC system are introduced respectively. Then,three types of hybrid HVDC system are built in PSCAD/EMTDC,and their response characteristics under fault scenarios of AC system at sending and receiving ends are compared and analyzed. Finally,the advantages and disadvantages of each topological structure are summarized based on the simulative results. Simulative results show that the power interruption may occur in Scheme 1 when fault occurs in the AC system at sending end,and the fault response characteristics of Scheme 1 are better than those of the other two schemes when fault occurs in the AC system at the receiving end.
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