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RISS 인기검색어
- 검색키워드
- 저자 : Xueping Ji (검색결과 4 건)
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Xueping Gao,Lijun Fu,Yan Zhang,Feng Ji 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.12
The hybrid energy storage systems (HESSs) in vessel integrated power systems can support pulse load and improve system stability. However, the unbalanced SOC of different energy storage devices can cause over-charge and over-discharge which damages the energy storage devices and affects the stable operation of the entire system, especially when there are multiple groups of HESSs. Therefore, a decentralized control strategy for the HESSs in integrated power systems (IPSs) based on extended droop control combined with SOC balance control is proposed in this paper. In the proposed strategy, SOC recovery control is introduced to the virtual capacitance droop coefficient of the supercapacitor, and SOC equalization control is introduced to the virtual resistance droop coefficient of the lithium battery to adjust the output characteristics of the HESS according to the SOC. Then the frequency response characteristics are analyzed and the stability of the system is calculated. Finally, the hardware in loop simulation is conducted to verify the effectiveness of the proposed strategy. Comparisons show that the proposed strategy can compensate for the pulse load according to the responding characteristics of the HESS and achieve SOC balance between different energy storage devices under various working conditions.
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A Demand Side Management Strategy to Reduce the Impact of High Power Pulse Load Integration
Gao Xueping,Zhang Yan,Ji Feng,Fu Lijun 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
High pulsed power loads (HPPLs) are highly non-linear and can cause signifi cant stability and power quality issues in a microgrid. Developing alternative methods for controlling and analyzing the microgrid with multiple HPPLs will provide insight into tradeoff s that can be made during the design phase. In this paper, a demand side management strategy of HPPLs in a microgrid is formulated. Firstly, the HPPLs are divided into energy storage connected high power pulse loads (EHPPLs) and direct connected high power pulse loads (DHPPLs) according to the power use of the back-end loads, and the energy management models of both the EHPPLs and the DHPPLs are built. Then the demand side management strategy to minimize the impacts of running HPPLs is proposed. Finally, three typical cases are studied to verify the fl exibility and eff ectiveness of the proposed method. The simulation and experiment results indicate that the proposed strategy can eff ectively reduce the peak power demand of the HPPLs, thus reducing the impact on the microgrid
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Optimal Operation Schedule Strategy of High-power Pulsed Loads in Shipboard Power System
Zhang Yan,Ji Feng,Gao Xueping,Ma Fan,Hu Qi 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
With the vigorous development of the scientifi c and technological revolution, new military and engineering loads with high power and pulse characteristics are becoming reality for the shipboard power system (SPS) application. These loads are usually called high-power pulsed loads (HPPLs) because of their high peak power, low average power and short cycle time. The HPPLs can cause voltage drop and even system instability to the SPS, thus bringing severe challenges to their power supplying system. To address these issues, an optimal operation schedule of HPPLs in SPS is studied in this paper. Firstly, the models of HPPLs for SPS power optimization are proposed based on the real back-end load connection way of them. Then the mixed integer programming problem aiming at maximizing the operation effi ciency of the HPPLs within the SPS support capability is constructed. Finally, some typical cases are studied to verify the fl exibility and eff ectiveness of the proposed strategy. The results indicate that the proposed strategy can eff ectively maximize the operational effi ciency of HPPLs in the SPS, and the superiority becomes more obvious as the number of HPPLs increases.
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Jujie Ren,Miao Zhai,Min Cui,Liujia Li,Congcong Yu,Xudong Yu,Xueping Ji 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1
A superoxide anion radical (O2 ˙-) nonenzymatic electrochemical sensor based on PtRuCu ternary alloy nanoparticles/electrochemically reduced graphene oxide (ERGO) composite modified glassy carbon electrode (PtRuCu/ERGO/GCE) was developed. ERGO and PtRuCu/ERGO composites were characterized by scanning electron microscopy. The prepared PtRuCu/ERGO/ GCE showed remarkable performance toward the electrocatalytic reduction of (O2 ˙-). The sensor possessed a high sensitivity of 1725µA · mM-1 · cm-2, a wide linear range of 7.5–330 µM (R2 = 0.993) and a low detection limit of 0.7 µM (S/N = 3), as well as excellent selectivity, reproducibility and stability, which can be attributed to the synergistic effect of ERGO and PtRuCu ternary alloy nanoparticles. Therefore, the prepared sensor is promising for electrochemical determination of O2˙-.
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