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Liqiao Wang,Hang Jiao,Gen Yang,Jing Li,Yun Zhang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.1
The isolated dual active bridge DC/DC converter is widely used in power electronic conversion systems due to its security, scalability, and easily realized soft switching. Meanwhile, interleaved technology is also widely used in high current conversion applications due to its low current ripple. Current sharing characteristics are analyzed in detail in this paper based on the topology characteristics of an interleaved low current ripple isolated DC/DC converter. At the same time, under dynamic conditions, the altering trend of the current deviation ratio and the relationship between the current deviation rate and the phase-shifted angle are revealed by small signal modeling. In addition, a single-zero double-pole compensation control method in the current loop is proposed. Finally, an experimental 670 W prototype is built to verify the correctness of the theoretical analysis and the effectiveness of the proposed method.
Voltage equalization control of three‑phase cascaded H‑bridge multilevel rectifiers
Liqiao Wang,Xuchen Chen,Zukun Zhang,Xuemeng Guo 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
According to the structure and characteristics of a three-phase cascaded H-bridge (CHB) of a high-power multilevel converter, the problem of DC side voltage imbalance in practical applications and the disadvantage where the complexity of the traditional centralized control voltage equalization scheme increases rapidly with an increase of the number of modules both need to be solved. In addition, with the characteristic that distributed control is conducive to the expansion of the system to high-power and multi-module cascade, a new quasi-distributed equalization control strategy is proposed in this paper. The new equalization control strategy combines the traditional closed-loop control with the modulation ratio correction method. On the basis of the traditional closed-loop control, an equalization control module is added to realize a balanced output of the DC side voltage. The control of the equalization control module is simple and flexible, and the complexity of the overall control algorithm is independent of the number of modules. Finally, the correctness and reliability of the control method are verified by experiments.
Wenkai Xu,Peng Zhao,Liqiao Ning 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
Train delay is an inevitable phenomenon in urban rail transit system, but it usually has ripple effects by propagating to other trainsand lines. In particular, last train delay has serious effect on transfer passengers’ regular trips. Transfer passengers from last trainsconcretely fall into two types in this paper: passengers transferring from the last train of feeder line to the last train of connecting line(LtoL) or from the last train of feeder line to un-last train of connecting line (LtoU). Then the last train network delay managementmodel is presented with two objectives: maximizing connecting passengers and minimizing Average Transfer Waiting Time (ATWT)of LtoL transfer passengers. To solve large-scale practical problems rapidly, an efficient genetic algorithm is designed based on thismodel. Finally, the Beijing subway network is taken as a case study to verify the effectiveness of this model. Under various last traindelay scenarios, the results show that the bi-objective model can increase the number of connections between last trains andconnecting passengers, meanwhile, there is a big decline in the ATWT of LtoL transfer passengers.
Xing, Qianguo,Wu, Lingling,Tian, Liqiao,Cui, Tingwei,Li, Lin,Kong, Fanzhou,Gao, Xuelu,Wu, Mengquan Elsevier 2018 Marine pollution bulletin Vol.133 No.-
<P><B>Abstract</B></P> <P>The world's largest green tide originated from the Jiangsu Shoal of the Yellow Sea was due to fast reproduction of floating green macroalgae (<I>Ulva prolifera</I>). It brought significant impacts on marine environment and ecosystem in the Yellow Sea. In this study, we examined the expansion of green tide from the Jiangsu Shoal during the period from 29 April to 25 June 2016. Using high-resolution satellite images, we revealed a declined growth rate during the northward drifting of early-stage green tide for the first time, i.e., the green tide had higher growth rate (up to 25% per day) in the turbid waters of the Jiangsu Shoal in May and a lower growth rate (low to 3% per day) in the relatively clear waters in the middle of the western Yellow Sea in June, which suggests that water clarity might not be the key factor controlling the growth rate of the floating macroalgae in the surface waters under natural conditions. The high growth rate led to shortened time windows for controlling the green tide by employing macroalgae collecting campaigns at the initial sites of the green tide, which was no more than 14 days in the 2016 case.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Using high-resolution satellite image for detecting early-stage green tide </LI> <LI> Found changing growth rate of green tide </LI> <LI> Assessed the countermeasure of collecting floating-macroalgae at the initial sites </LI> </UL> </P>
Shaoyong Ke,Ting Ke,Zhigang Zhang,Liqiao Shi,Daye Huang,Kaimei Wang,Ziwen Yang,Nina Yang 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.3
The phytophagous mite is highly polyphagous and widespread in warmer regions and greenhouses around the world, and so the focus of novel acaricides is shifting towards more effective, ecofriendly new chemical entity with unique modes of action. In this study, eighteen spirobutyrolactones derived from natural tetronic acid have been synthesized and their acaricidal activities against Tetranychus cinnabarinus were investigated by slide-dip method. The results of preliminary bioassay indicate that some of these compounds exhibited promising acaricidal activities, especially, compounds 6 and 18 show significant activities against T. cinnabarinus than the commercial spirodiclofen 1 (27.37% mortality), and which present 58.55% and 82.24% mortality at tested dose, respectively. The relationship between structure and acaricidal activity was also discussed based on the experimental data, and which indicate that the compounds (16, 17 and 18) with non-substituted phenyl ring (R1=H) show obviously better activities. Especially, we also can find that substituted benzoyl unit will help to increase the activity than substituted phenylacetyl group.