Based on the comparison of existing power flow controllers(PFC)in meshed HVDC grids,the full-bridge modular multilevel converter based PFC(MMPFC)is proposed.At first,the general branch current calculation method of me...Based on the comparison of existing power flow controllers(PFC)in meshed HVDC grids,the full-bridge modular multilevel converter based PFC(MMPFC)is proposed.At first,the general branch current calculation method of meshed HVDC grids with the PFC is presented,and then,the issue of over-voltage on the thyristor based PFC is described and analyzed.Through the analysis of different operating modes of the full-bridge sub-module,the mechanism of over-voltage ride through of the MMPFC is indicated.The control strategy of the MMPFC,which is used to control branch current and keep capacitor voltage balancing,is elaborated.Finally,the performance on current regulation,bidirectional operation and over-voltage ride through is simulated and verified in a built model with PSCAD/EMTDC.展开更多
Globalization 4.0Chinese Vice President Wang Qishancalled on countries to work together to shape the global architecture in the age of the Fourth Industrial Revolution on January 23, with the vision to create a better...Globalization 4.0Chinese Vice President Wang Qishancalled on countries to work together to shape the global architecture in the age of the Fourth Industrial Revolution on January 23, with the vision to create a better future for all humanity.While addressing the World Economic Forum Annual Meeting 2019, Wang said it is imperative to respect national sovereignty and refrain from seeking technological hegemony or interfering in other countries’ domestic affairs.展开更多
基金supported by the National High Technology Research and Development Program of China("863"Program)(Grant No.2012AA050205)
文摘Based on the comparison of existing power flow controllers(PFC)in meshed HVDC grids,the full-bridge modular multilevel converter based PFC(MMPFC)is proposed.At first,the general branch current calculation method of meshed HVDC grids with the PFC is presented,and then,the issue of over-voltage on the thyristor based PFC is described and analyzed.Through the analysis of different operating modes of the full-bridge sub-module,the mechanism of over-voltage ride through of the MMPFC is indicated.The control strategy of the MMPFC,which is used to control branch current and keep capacitor voltage balancing,is elaborated.Finally,the performance on current regulation,bidirectional operation and over-voltage ride through is simulated and verified in a built model with PSCAD/EMTDC.
文摘Globalization 4.0Chinese Vice President Wang Qishancalled on countries to work together to shape the global architecture in the age of the Fourth Industrial Revolution on January 23, with the vision to create a better future for all humanity.While addressing the World Economic Forum Annual Meeting 2019, Wang said it is imperative to respect national sovereignty and refrain from seeking technological hegemony or interfering in other countries’ domestic affairs.
