DOI:10.35833/MPCE.2021.000569 DC Current Order Optimization Based Strategy for Recovery Performance Improvement of LCC-HVDC Transmission Systems Page view: 3        Net amount: 17 Author: Renlong Zhu1,Xiaoping Zhou1,Shuchen Luo2,Lerong Hong1,Hanhang Yin1,Yifeng Liu1 Author Affiliation: 1.the College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;2.the State Grid Hunan Electric Power Company Limited Economical and Technical Research Institute, Changsha 410011, China Foundation: This work was supported by the National Key Research and Development Program of China (No. 2021YFB2400902), the Innovation Young Talents Program of Changsha Science and Technology Bureau (No. kq2107005), and the Postgraduate Scientific Research Innovation Project of Hunan Province (No. QL20210101). Abstract: For the safe and fast recovery of line commutated converter based high-voltage direct current (LCC-HVDC) transmission systems after faults, a DC current order optimization based strategy is proposed. Considering the constraint of electric and control quantities, the DC current order with the maximum active power transfer is calculated by Thevenin equivalent parameters (TEPs) and quasi-state equations of LCC-HVDC transmission systems. Meanwhile, to mitigate the subsequent commutation failures (SCFs) that may come with the fault recovery process, the maximum DC current order that avoids SCFs is calculated through imaginary commutation process. Finally, the minimum value of the two DC current orders is sent to the control system. Simulation results based on PSCAD/EMTDC show that the proposed strategy mitigates SCFs effectively and exhibits good performance in recovery. Keywords: Line commutated converter (LCC) ; high-voltage direct current (HVDC) ; DC current order calculation ; subsequent commutation failure (SCF) ; recovery Received:August 17, 2021               Online Time:2023/05/23 View Full Text       Download reader