Ziyue Zhang

Southwest Jiaotong University

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Dongxin He

Shandong University

Hongshun Liu

Shandong University

Qingquan Li

Shandong University

Tian Xia

Heilongjiang University

Taiyu Chen

Nanjing Forestry University

Rongbin Zhou

Institute of High Energy Physics

Jianping Xu

Southwest Jiaotong University

Jingjing Yang

Hebei North University

Shungang Xu

First Affiliated Hospital of Wenzhou Medical University

Yunsi Fei

Northeastern University

Cooperative Institutions

Southwest Jiaotong University

Shandong University

Universidad del Noreste

Ministry of Education of the People's Republic of China

China University of Mining and Technology

Northeastern University

Inner Mongolia University of Science and Technology

North China University of Science and Technology

Northeast Normal University

Kunming University of Science and Technology

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Simplified Modelling of Transient Ground Potential Rise of GIS in Ultra-high-voltage Substations with Hybrid Reactive Power Compensation

Electric Power Systems Research (2021)

Hongshun Liu Ziyue Zhang Taiyu Chen Jingjing Yang Qingquan Li

Switchgear

Overvoltage

Transient (computer programming)

High Voltage

10.1016/j.epsr.2021.107441

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Citations (3)

Analysis of overvoltage impact on shell-type on-board traction transformer by multi-physics field simulation

Advances in Engineering Technology Research (2024)

Ziyue Zhang Zijing Wang Song Xiao

With the rapid development and increasing demands for the high-speed railway in China, it is of great significance to examine the defects of the high-speed train and ensure the safety of the operating railway. In the actual operation of the high-speed train, there is a split-phase section to transit the train to the next substation power supply arm. In this particular stage, operational overvoltage would occur as the VCB and the pantograph switch on and off, which threatens the safety of the operation of high-speed trains and contributes to the breakdown of transformer windings, which is indispensable in transformer operation. In this work, a finite element model of shell type on board traction transformer is constructed and multi-physics field simulation results, including electromagnetic field, temperature field, and flow velocity field, are analyzed to investigate the potential risky spots in the practical operation of high-speed train under overvoltage impulse, which could be supportive in maintaining the devices and detecting the winding defects.

Pantograph

Overvoltage

Catenary

Autotransformer

Traction substation

Traction power network

10.56028/aetr.9.1.715.2024

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A Low Frequency Ripple Current Suppression Strategy for Single-Phase Photovoltaic Grid-Connected Inverter

IEEE Journal on Emerging and Selected Topics in Circuits and Systems (2023)

Ping Yang Shungang Xu Fanwei Meng Ziyue Zhang Rongbin Zhou

Due to the absence of the insulated transformer, the non-insulated photovoltaic (PV) inverter possesses excellent properties such as small size, light weight, etc. However, the inherent parasitic capacitance between the PV panels and the ground brings serious leakage current problem, which has been the focus of researchers. Since the instantaneous power of the single-phase inverter results in a ripple current at a double-frequency ripple(100Hz), according to the theorem of conservation of power, the fluctuation of PV panels output voltage leads to a double frequency ripple of input current, which will have a negative influence on the maximum power point tracking in terms of PV panels and reduce the utilization efficiency of solar energy. This paper aims to investigate the suppression of the leakage current of PV single-phase inverters and the double-frequency ripple, the circuit proposed in this paper substitutes a bridge arm of the conventional PV grid-connected inverter with a Boost converter, which can eliminate the leakage current directly. The suppression strategy of double-frequency ripple for the proposed topology is provided as well. By transferring the double-frequency ripple in the DC-link capacitor of the inverter to another capacitor that has no connection to loads, it can suppress the low-frequency ripple current of the input side effectively. The paper verifies the feasibility of the proposed topology and the corresponding control strategy through simulation and experimental results.

Solar micro-inverter

10.1109/jetcas.2023.3262768

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Citations (7)

Array Design of High-Density Emerging Memories Making Clamped Bit-Line Sense Amplifier Compatible with Dummy Cell Average Read Scheme

IEICE Transactions on Electronics (2020)

Ziyue Zhang Takashi Ohsawa

Reference current used in sense amplifiers is a crucial factor in a single-end read manner for emerging memories. Dummy cell average read scheme uses multiple pairs of dummy cells inside the array to generate an accurate reference current for data sensing. The previous research adopts current mirror sense amplifier (CMSA) which is compatible with the dummy cell average read scheme. However, clamped bit-line sense amplifier (CBLSA) has higher sensing speed and lower power consumption compared with CMSA. Therefore, applying CBLSA to dummy cell average read scheme is expected to enhance the performance. This paper reveals that direct combination of CBLSA and dummy cell average read scheme leads to sense margin degradation. In order to solve this problem, a new array design is proposed to make CBLSA compatible with dummy cell average read scheme. Current mirror structure is employed to prevent CBLSA from being short-circuited directly. The simulation result shows that the minimum sensible tunnel magnetoresistance ratio (TMRR) can be extended from 14.3% down to 1%. The access speed of the proposed sensing scheme is less than 2 ns when TMRR is 70% or larger, which is about twice higher than the previous research. And this circuit design just consumes half of the energy in one read cycle compared with the previous research. In the proposed array architecture, all the dummy cells can be always short-circuited in totally isolated area by low-resistance metal wiring instead of using controlling transistors. This structure is able to contribute to increasing the dummy cell averaging effect. Besides, the array-level simulation validates that the array design is accessible to every data cell. This design is generally applicable to any kinds of resistance-variable emerging memories including STT-MRAM.

Sense amplifier

Array data structure

Current mirror

10.1587/transele.2019ecp5039

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Investigation on the Influencing Factors of Arcing Time for Secondary Arcs

IEEE Transactions on Industrial Electronics (2021)

Hongshun Liu Ziyue Zhang Tian Xia Jingjing Yang Qingquan Li

When the single-phase grounding fault is removed due to interruptions in circuit breakers, a secondary arc emerges and continues to burn, which weakens the continuity and stability of electrical power supplies. Therefore, analyses of the influencing factors of the arcing time are necessary to find suppression technologies for secondary arcs. Scatter plots of the arcing time as a function of the relevant parameters for each experiment are plotted to determine the distribution rule for the scattered points. In addition, the correlation coefficients between the arcing time and the relevant parameters are calculated through statistical correlation algorithm processing. Finally, multivariate fitting is performed between the arcing time and the relevant parameters, and a function is obtained from the fitting for testing. The results show that the arc length and secondary current are significantly positively correlated with the arcing time, while the maximum recovery voltage is significantly negatively correlated. However, the arc area and diameter have little correlation with the arcing time. The proposed method not only provides theoretical support and suppression measures for secondary arcs but can also be applied as an effective means to improve the continuity and security of electrical power supplies.

Electric arc

10.1109/tie.2021.3127019

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Citations (5)

A Fast and Accurate Guessing Entropy Estimation Algorithm for Full-key Recovery

DOAJ (DOAJ: Directory of Open Access Journals) (2020)

Ziyue Zhang A. Adam Ding Yunsi Fei

10.13154/tches.v2020.i2.26-48

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Citations (1)