This page has only limited features, please log in for full access.
YUQING DONG was born in Jiangsu, China, in 1995. She received the B.S. degree from Sichuan University, Chengdu, China, in 2017, where she is currently pursuing the Ph.D. degree with the College of Electrical Engineering Technology. She is now a visiting scholar at the University of Tennessee. Her current research interests include high voltage direct current and power system stability.
Line commutated converter (LCC) has been widely applied in hybrid high voltage direct current (HVDC) transmission system, where the modular multilevel converter (MMC) is applied as receiving end and may induce low order harmonics in DC-link voltage. These low order harmonics will introduce the low frequency fluctuation into the control loop of LCC and complex the harmonics analysis. The traditional method to calculate LCC harmonics is derived by the switching function and modulation theory, which only obtains characteristic harmonics. The low-frequency fluctuation superimposed on the firing angle in the control system is ignored in the traditional method. In this paper, the interharmonics, which is introduced by firing angle fluctuation, is revealed by the double Fourier method. A fitting function method is applied for depicting the varied commutation overlap caused by firing angle fluctuation. Compared to the traditional method, the proposed method can effectively analyze both characteristic harmonics and interharmonics in the condition of low-frequency fluctuation of the firing angle. The accuracy and effectiveness of the theoretical analysis are verified with a three-phase LCC rectifier built in PSCAD/EMTDC and experimental test.
He Huang; Junpeng Ma; Shunliang Wang; Yuqing Dong; Ning Jiao; Tianqi Liu. Accurate Analysis of Harmonic Transmission of Line Commutated Converter Considering Firing Angle Fluctuation. IEEE Access 2020, 8, 205206 -205215.
AMA StyleHe Huang, Junpeng Ma, Shunliang Wang, Yuqing Dong, Ning Jiao, Tianqi Liu. Accurate Analysis of Harmonic Transmission of Line Commutated Converter Considering Firing Angle Fluctuation. IEEE Access. 2020; 8 ():205206-205215.
Chicago/Turabian StyleHe Huang; Junpeng Ma; Shunliang Wang; Yuqing Dong; Ning Jiao; Tianqi Liu. 2020. "Accurate Analysis of Harmonic Transmission of Line Commutated Converter Considering Firing Angle Fluctuation." IEEE Access 8, no. : 205206-205215.
Due to the heavy stress on environmental deterioration and the excessive consumption of fossil resources, the transition of global energy from fossil fuel energy to clean energy has significantly accelerated in recent years. The power industry and policymakers in almost all countries are focusing on clean energy development. Thanks to progressive clean energy policies, significant progress in clean energy integration and greenhouse gas reduction has been achieved around the world. However, due to the differences in economic structures, clean energy distributions, and development models, clean energy policy scope, focus, and coverage vary between different countries, states, and utilities. This paper aims at providing a policy review for readers to easily obtain clean energy policy information on various clean energies in the U.S. and some other countries. Firstly, this paper reviews and compares some countries’ clean energy policies on electricity. Then, taking the U.S. as an example, this paper introduces the clean energy policies of some representative states and utilities in the U.S in perspectives of renewable energies, electric vehicles, and energy storage.
Kaiqi Sun; HuangQing Xiao; Shengyuan Liu; Shutang You; Fan Yang; Yuqing Dong; Weikang Wang; Yilu Liu. A Review of Clean Electricity Policies—From Countries to Utilities. Sustainability 2020, 12, 7946 .
AMA StyleKaiqi Sun, HuangQing Xiao, Shengyuan Liu, Shutang You, Fan Yang, Yuqing Dong, Weikang Wang, Yilu Liu. A Review of Clean Electricity Policies—From Countries to Utilities. Sustainability. 2020; 12 (19):7946.
Chicago/Turabian StyleKaiqi Sun; HuangQing Xiao; Shengyuan Liu; Shutang You; Fan Yang; Yuqing Dong; Weikang Wang; Yilu Liu. 2020. "A Review of Clean Electricity Policies—From Countries to Utilities." Sustainability 12, no. 19: 7946.
Replacing expensive IGBT with thyristor to design DC circuit breaker (DCCB) is attracting attention recently due to its advantages in terms of low investment and low conduction loss. However, due to the half-controlled characteristic of thyristor, the existing thyristor-based DCCBs (T-CBs) cannot be actively turned OFF. As a result, the opening process is not fully controllable and reliable. In this letter, a simple active T-CB (AT-CB) topology is proposed. The proposed AT-CB can interrupt both fault current and operation current actively, and the current breaking process is fast, reliable, and fully controllable. Moreover, the proposed AT-CB can be improved to be bidirectional without increasing the conduction loss, and the topology remains simple. Parameters design principle and operation process of AT-CB is presented. Scaled-down experiment verified the effectiveness of the proposed solution.
Ji Shu; Junpeng Ma; Shunliang Wang; Yuqing Dong; Tianqi Liu; Zhiyuan He. A New Active Thyristor-Based DCCB With Reliable Opening Process. IEEE Transactions on Power Electronics 2020, 36, 3617 -3621.
AMA StyleJi Shu, Junpeng Ma, Shunliang Wang, Yuqing Dong, Tianqi Liu, Zhiyuan He. A New Active Thyristor-Based DCCB With Reliable Opening Process. IEEE Transactions on Power Electronics. 2020; 36 (4):3617-3621.
Chicago/Turabian StyleJi Shu; Junpeng Ma; Shunliang Wang; Yuqing Dong; Tianqi Liu; Zhiyuan He. 2020. "A New Active Thyristor-Based DCCB With Reliable Opening Process." IEEE Transactions on Power Electronics 36, no. 4: 3617-3621.