Xiaoqiang Guo

Xiaoqiang Guo

Yanshan University

H-index: 42

Asia-China

About Xiaoqiang Guo

Xiaoqiang Guo, With an exceptional h-index of 42 and a recent h-index of 35 (since 2020), a distinguished researcher at Yanshan University, specializes in the field of Power electronics for microgrid and smartgrid.

His recent articles reflect a diverse array of research interests and contributions to the field:

Passivity-Based Nonsingular Terminal Sliding-Mode Control for LC-Filtered Current Source Converter

Coordinated Control Strategy for Cascaded Current-Source Converter Under Unbalanced Grid Voltage

Application status of variable-frequency drive in hydrogen fuel cell air compressors from an industrial viewpoint: A review

A Novel DC–DC Converter for Electrolyzer With Low Ripple and High Step Down

An Overlap-Time Effect Elimination SVM Based on Vector Bridge Extension for Current-Source Converter

Insights into the mechanism of electric field regulating hydrogen adsorption on Li-functionalized N-doped defective graphene: A first-principles perspective

Electrically enhanced adsorption efficiency of aluminum nitride nanotube for sulfate ion removal from water

A High-Voltage Gain Transformerless GridConnected Inverter

Xiaoqiang Guo Information

University

Yanshan University

Position

Professor of Electrical Engineering

Citations(all)

6654

Citations(since 2020)

4433

Cited By

3991

hIndex(all)

42

hIndex(since 2020)

35

i10Index(all)

107

i10Index(since 2020)

87

Email

University Profile Page

Yanshan University

Xiaoqiang Guo Skills & Research Interests

Power electronics for microgrid and smartgrid

Top articles of Xiaoqiang Guo

Passivity-Based Nonsingular Terminal Sliding-Mode Control for LC-Filtered Current Source Converter

Authors

Hao Ding,Xiang Li,Xiaoqiang Guo,Shouxiang Li,Yongchang Zhang,Kai Ma,Josep M Guerrero

Journal

IEEE Transactions on Power Electronics

Published Date

2024/4/30

It is a big challenge for current source converter (CSC) to ensure the desired tracking performance, robustness, and immunity simultaneously in the presence of resonance caused by the grid-side LC filter and slowly time-varying filter parameters or load disturbances. Aiming at this problem, combining the advantages of passivity-based control (PBC) and nonsingular terminal sliding mode control (NTSMC), a hybrid PBC-NTSMC method is proposed. Based on virtual damping injection and energy dissipation theory, the PBC is firstly designed for the inner loop followed by the construction of the Euler-Lagrange (EL) model. In this way, the resonance suppression is realized and the CSC system is proved to be passive. Furthermore, the NTSMC is combined with PBC to improve the dynamic response, reduce the chattering problem of traditional sliding mode control, and enhance the robustness of the system while …

Coordinated Control Strategy for Cascaded Current-Source Converter Under Unbalanced Grid Voltage

Authors

Zhuoqun Wu,Xiaoqiang Guo,Baocheng Wang

Journal

IEEE Transactions on Power Electronics

Published Date

2024/2/20

Current-source converter is getting more and more attention due to its high reliability, which is suitable for electrical vehicle charging applications. To achieve popular 800 V or promising 1000 V fast charging, a cascaded current-source converter with higher output voltage capability has been proposed in recent years. However, the present control strategy for cascaded current-source converter is susceptible to unbalanced grid voltage, which is common in practical EV charging applications. To mitigate the unbalance and distortion of grid-side current and achieve reference voltage output under the unbalanced grid voltage, a coordinated control strategy for cascaded current-source converter is proposed in this article. The proposed strategy could coordinate and regulate the grid-side current, dc-link current and output voltage based on the degrees of freedom in front-stage and back-stage converters to maintain a …

Application status of variable-frequency drive in hydrogen fuel cell air compressors from an industrial viewpoint: A review

Authors

Xiaoqiang Guo,Xiaolei Hu,Shiqi Zhang

Published Date

2024/4/1

As an essential accessory of hydrogen fuel cells (HFC), air compressors have the problem of high energy consumption and high cost, which hinders the further development of HFC. Recently, the industry has adopted variable-frequency drive (VFD) to control the operation of HFC air compressors, and the energy-saving effect is remarkable. However, existing research mostly discusses related technologies academically and lacks data review on actual industrial applications, hindering industry standardization and maturity. Therefore, it is meaningful to summarize the current status of the HFC air compressor dedicated VFD industry chain. From the perspective of industrial application, this paper summarizes the current industrial product status of dedicated VFDs, HFC, air compressors, and motors. The purpose of this paper is to provide a useful reference guide for relevant researchers of HFCs and VFDs.

A Novel DC–DC Converter for Electrolyzer With Low Ripple and High Step Down

Authors

Xiaoqiang Guo,Shiqi Zhang,Fanqin Ding,Jie Zhu,Haoyu Bai

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/2/13

Electrolyzers are widely used in renewable energy hydrogen production, and the performance of electrolyzers is directly related to dc–dc converters. To realize the high-efficiency operation of the electrolyzer, new challenges, such as a high step-down ratio and low output current ripple, are put forward for the dc–dc converter. In this article, we propose a novel type of dc–dc converter for hydrogen production. The topology is simple and has the advantages of higher step-down gain and low switching stress. In addition, the scheme can achieve ultralow output current ripple without active devices. Finally, the topology connects the electrolyzer hydrogen production load in the experiment to verify the scheme's effectiveness.

An Overlap-Time Effect Elimination SVM Based on Vector Bridge Extension for Current-Source Converter

Authors

Naizhe Diao,Yupeng Wei,Xiaoqiang Guo

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/3/22

In order to effectively eliminate the overlap-time effect introduced by the addition of the overlap time in the space vector modulation (SVM), an overlap-time effect elimination SVM method based on vector bridge extension is proposed for current source converter (CSC). This article first selects the current vector as the bridge vector according to the ac side voltage relationships, and then uses the bridge vector to add the overlap time to the other two current vectors by bridge extension method, which make the dwell time of active vector the same as the ideal dwell time and the overlap-time effect can be directly eliminated without any compensation. In addition, by rearranging the order of the vectors, the number of switching times is reduced. Thus, this method sets the overlap time within the modulation, which is different from the traditional SVMs. The output current is the same as that of the ideal SVM, which can improve …

Insights into the mechanism of electric field regulating hydrogen adsorption on Li-functionalized N-doped defective graphene: A first-principles perspective

Authors

Yong Han,Yufeng Ni,Xiaoqiang Guo,Tifeng Jiao

Journal

Fuel

Published Date

2024/2/1

The hydrogen storage properties of lithium functionalized graphene under external electric fields have been studied in this work employing density functional theory (DFT) calculations. Lithium modified nitrogen doped double-vacancy graphene (Li_NDVG) was constructed as hydrogen storage material. It is examined in terms of the system’s electronic properties, H2 adsorption energy, and stable configuration. The results demonstrate that Li atoms can be distributed on the substrate surface and incorporated into defect centers without producing metal clusters. In comparison to pristine graphene, the adsorption energy of H2 on Li_NDVG is four times higher. The Coulomb force between Li atom and H2 molecule grows as the positive electric field’s strength increases, and the adsorption distance shrinks. On the contrary, the H2 adsorption energy decreases as the negative electric field’s strength increases, and the …

Electrically enhanced adsorption efficiency of aluminum nitride nanotube for sulfate ion removal from water

Authors

Yong Han,Ziyang Liu,Qingrui Zhang,Xiaoqiang Guo,Tifeng Jiao

Journal

Science of The Total Environment

Published Date

2024/3/15

Herein, the adsorption performance of sulfate ion in water on aluminum nitride nanotube(AlNNT) under the influence of an electric field was investigated using the density functional theory (DFT) calculation method. The model structure stability, adsorption energy, electronic and thermodynamic properties of sulfate ion adsorbed on the surface of AlNNT were studied. The calculation results indicate that sulfate ion reacts with multi-atoms on the surface of AlNNT, forming ionic bonds and undergoing chemical adsorption. As the electric field intensity increases, the adsorption energy and the transfer of electrons from sulfate ion to AlNNT increase, leading to a higher degree of hybridization of atomic orbitals and enhanced multi-atom interactions. Additionally, the thermodynamic data suggests that the adsorption between sulfate ion and AlNNT under electric field can occur spontaneously, the process of which is …

A High-Voltage Gain Transformerless GridConnected Inverter

Authors

Yupeng Wei,Xiaoqiang Guo,Zhe Zhang,Lichong Wang,Josep M Guerrero

Journal

IEEE Transactions on Industry Applications

Published Date

2024/1/22

Transformerless inverters are used in small and medium power photovoltaic grid-connected systems due to smallsize, low-cost and high-efficiency. Transformerless inverters have problems of leakage current and low-voltage gain in applications due to the lack of electrical isolation and boost characteristics of transformers. According to these problems, this paper introduces a gain unit circuit in the front-stage based on the two-stage topology of Boost converter combined with the H-bridge inverter to improve the boost capability. In addition, the rear-stage converter adopts double Buck inverter, which has the ability to prevent the short circuit of the bridge arms and improves the reliability of the system. At the same time, it is ensured that there is no high-frequency component in the parasitic capacitor voltage, and the leakage current is suppressed. In this paper, the operational modes, circuit gain, devices stress and loss …

High-Precision Injection Current Sampling Scheme for Direct Drive Low-Speed Position Sensorless Control of Switched Reluctance Machine

Authors

Xiaoqiang Guo,Shuanggui Zeng,Rui Zhong,Wei Hua

Journal

IEEE Transactions on Industrial Electronics

Published Date

2024/3/8

In cost-sensitive applications, the controller usually creates great noise that affects the current sampling accuracy. In this article, based on the conventional direct drive low-speed position sensorless control of switched reluctance machine (SRM), a high-precision injection current sampling scheme is proposed to improve the current sampling accuracy and thus the commutation position accuracy. First, the errors in the conventional current sampling are analyzed quantitatively. Second, aiming at reducing the current sampling noise, a dual-channel current sampling circuit is proposed to improve the current sampling accuracy. Third, a pulse current peak value prediction method based on the curve intersection method is proposed, so the error caused by discrete sampling can be reduced. Finally, the experimental setup is established and experiments under both the steady-state and transient-state are conducted, which …

Multiphase stacked interleaved buck converter for hydrogen-production electrolysis with a low-voltage-stress ripple compensation circuit

Authors

Le Sun,Zhaoguo Liu,Xiaoqiang Guo,Xiaochen Wang,Lichong Wang

Journal

CSEE Journal of Power and Energy Systems

Published Date

2024/2/27

The multiphase stacked interleaved buck converter (SIBC) is suitable for large-power water electrolysis applications due to its merits of high current output capability and zero output current ripple. However, the auxiliary converter used for compensating current ripple still has to withstand high voltage stress. This paper proposes a new multiphase SIBC applied in the multicarrier energy system integrating electricity, heat and hydrogen. A resistor-capacitor voltage divider is used to provide the input voltage of the auxiliary converter and as a heater for the thermal loads. Thus, the voltage stress of the auxiliary converter can be reduced at a low cost and the size of the filter inductor can be reduced. By accurate voltage and current analysis and appropriate parameter design, the voltage stresses of both the switches and the capacitors in the auxiliary converter can be further limited within an expected range. The …

Analysis of Recent Developments in Three-Phase Transformerless Inverter Topologies for Photovoltaic and Electric Vehicle Applications

Authors

Ahmad Syed,Tara Kalyani Sandipamu,Freddy Tan Kheng Suan,Xiaoqiang Guo,Huai Wang,B Mouli Chandra

Published Date

2023/11/29

At present, transformerless photovoltaic inverter topologies (TLPVIT) are more popular due to their high-class feature in terms of size, weight, and efficiency, respectively. However, the analysis of many interesting single-phase transformerless photovoltaic inverter configurations (TPVIC) with galvanic isolation and common-mode voltage clamping (CMV) methods has been investigated and concluded that CMV clamping topologies have excellent features compared to galvanic isolation in the form of CMV and CM-leakage current. The main aim of this chapter is to compare and analyze various three-phase transformerless inverter configurations with and without clamping techniques and their impact on CM-voltage as well as CM-leakage current suppression. In addition, a simple modified clamping three-phase transformerless inverter structure and corresponding pulse-width modulation is proposed based on a …

An Improved One-Dimensional Space Vector Modulation for Three-Phase Five-Level Cascaded H-Bridge Inverters

Authors

Jiale Zhou,Xiuhu Sun,Tiefu Zhao,Qiang Mu,Xiaoqiang Guo

Published Date

2023/10/29

This paper proposes an improved one-dimensional space vector modulation (ODSVM) strategy for a three-phase five-level cascaded H-bridge (CHB) inverter. In the improved ODSVM, the voltage vectors with a common-mode voltage (CMV) of ±2V dc /3 are replaced by their redundant vectors, and high-frequency switching events are implemented in a rotating manner. As a result, CMV attenuation and optimal line-to-line voltage harmonic spectrum are achieved for the five-level CHB inverter, surpassing the traditional phase-shifted pulse width modulation (PS-PWM) method and the traditional ODSVM scheme. Additionally, power balance among power semiconductor devices and power loss reduction are achieved, leading to efficiency improvement. Furthermore, the improved ODSVM eliminates the need for dead-time. Finally, the effectiveness of the improved ODSVM is validated through simulation and …

Online Self-Commissioning of Unsaturated Inductance Characteristics for Low-Speed Position Sensorless Control in Switched Reluctance Machines

Authors

Xiaoqiang Guo,Shuanggui Zeng,Rui Zhong,Wei Hua

Journal

IEEE Transactions on Industrial Electronics

Published Date

2023/7/28

In this paper, a novel method for online self-commissioning of the unsaturated inductance characteristics is proposed, which is utilized for low-speed sensorless control in switched reluctance machines (SRMs). Firstly, a dual-phase current chopping (DPCC) method is proposed to tune the rotor to any desired position, which does not need any clamping devices or position sensors. Then, the unsaturated inductance values at some sample positions are identified by the well-known current slope difference (CSD) method. Afterward, a feature position identification method combined with a regional linear interpolation method is proposed to construct the accurate full-cycle unsaturated inductance. To this extent, the self-commissioning process finishes and the controller switches to normal sensorless control mode. High-frequency (HF) pulses are firstly injected into the idle phase and the discrete inductance value during …

A Low-Speed Position Sensorless Scheme From Standstill For Low-Cost SRM Drives Based on Triple Current Slope Difference Threshold

Authors

Xiaoqiang Guo,Shuanggui Zeng,Min Wu,Rui Zhong,Wei Hua

Journal

IEEE Transactions on Industrial Electronics

Published Date

2023/5/22

In this article, a triple current slope difference (CSD) threshold based low-speed sensorless scheme for low-cost SRM drives is proposed. First, slope based methods, including the CSD method, are proposed and the advantages in terms of anti-interference ability over traditional instantaneous value based methods have been clarified. Second, the traditional single/double threshold methods and corresponding outgoing/incoming phase injection types are introduced and comprehensively compared. The limitations of conventional methods while adopted in low-cost SRM drives are stated. Accordingly, to solve the problem that the current cannot be obtained during the demagnetization stage in the resistor-based current sampling scheme, the triple CSD threshold method is proposed, whose third threshold indicates the zero-current position. Third, a general threshold value determination method considering the three …

Improved hydroxyl radical production by electric-field-induced catalysis in O3/H2O2 process: A reactive molecular dynamics perspective

Authors

Yong Han,Bingjia Wei,Xiaoqiang Guo,Tifeng Jiao

Journal

Journal of Molecular Liquids

Published Date

2023/1/1

O3/H2O2 process, as a well-used ozone advanced oxidation technology, has been considered to be suitable for treating a variety of organic wastewater. However, the low solubility of ozone in hydrogen peroxide aqueous solution makes the catalytic effect to ozone reaction unsatisfactory. In this study, a novel method of external electric field (EEF) catalyzing O3/H2O2 process was proposed. The chemical reaction in O3/H2O2 process under EEF were investigated by reaction molecular dynamics simulation. The mechanism of the catalytic effect of EEF on chemical reactions in the O3/H2O2 system was revealed by analyzing the system energy, hydrogen bond energy, reaction rate and degree of reaction of the reactants, and the amount of reaction products under EEF with different strength. The results show that EEF can significantly promote the ionization reaction of H2O2 to produce more HO– 2, which further …

A Coordination Control Method for Current Stress Reduction in High-Frequency Link Matrix Converter

Authors

Xiaoqiang Guo,Lige Zhang,Yupeng Wei,Sifan Wu

Journal

IEEE Transactions on Industrial Electronics

Published Date

2023/11/21

Due to the potential for high power density and high efficiency, the high-frequency link matrix converter has been increasingly used in power conversion. However, there is a large voltage difference on the leakage inductance of the high frequency transformer, resulting in high current stress. High current stress will reduce hardware utilization, increase costs, and reduce efficiency. To optimize the operation of the high-frequency link matrix converter, the control method of H-bridge duty cycle variable by adjusting the modulation index and phase shift angle is proposed in this article to keep converter in the lowest current stress state. Then, to obtain the combination of phase shift angle and modulation index at different powers, a mathematical model of the transferred power is established based on the sector division of space vector modulation. Experimental results on a high-frequency link matrix converter are provided …

Evaluation of linear stability operating boundary for voltage source converter under grid faults

Authors

Yuqiang Yang,Naizhe Diao,Le Sun,Xiaoqiang Guo,Mariusz Malinowski

Journal

Energy Reports

Published Date

2023/4/1

Voltage source converters have been used in high voltage direction current systems, which provides various advantages such as reduction in installation cost and space, easy connectivity with renewable energy sources and enhanced power quality. One of the most important issues is how to ride through the grid faults to ensure the stability operation of voltage source converters. In practice, however, there are practical considerations of physical restrictions such as the linear stability operating boundary, beyond which the current would be distorted, even the system would be instable. In this paper, a quantitative analysis and evaluation of the linear stability operating boundary is presented for operating the voltage source converter under grid faults. The proposed method indicates that the operating boundary mainly depends on the circuit parameters and control strategies. Simulation results have provided to verify …

An embedded magnetic encoder based rotor position estimation for switched reluctance machine

Authors

Xiaoqiang Guo,Yuchen Wang,Xingyu Chen,Ziyi Chen,Wei Hua,Rui Zhong

Journal

IEEE Transactions on Transportation Electrification

Published Date

2023/3/6

This paper investigates the possibility of applying embedded magnetic encoder (EME) consisting of three linear Hall sensors (LHS) for rotor position estimation in SRM. The key concept of this scheme is to detect the flux density characteristics (FDC) inside of stator slots. However, the armature field is to be detected in SRM, which is rather different from permanent magnet (PM) machines, where the PM field is detected. In this paper, FDC in stator armature slot openings are firstly analyzed between different winding configurations. Thus, a selection principle of winding configuration is proposed. Secondly, the proper installation location of LHS is investigated, where the sensitivity of FDC to location deviation is discussed. Accordingly, a sensor holder is specifically designed and manufactured to reduce location deviation. Thirdly, based on the detected FDC, a simplified multiple complex-coefficient filter (MCCF) is …

Ahmad Syed

Authors

Tara Kalyani Sandipamu,Freddy Tan Kheng Suan,Xiaoqiang Guo,Huai Wang,B Mouli Chandra

Journal

The Future of Road Transportation: Electrification and Automation

Published Date

2023/11/29

The applications of transformerless photovoltaic inverters in electrical vehicles are growing fast and attract many researchers to investigate various grid-connected single-phase and three-phase systems [1]. Recently, power generation through solar panels has been growing fast due to increased population and industries to meet the

Resilience Evaluation of Cyber-Physical Power System Considering Cyber Attacks

Authors

Xiangxing Kong,Zhigang Lu,Xiaoqiang Guo,Jiangfeng Zhang,Huifeng Li

Journal

IEEE Transactions on Reliability

Published Date

2023/7/25

With the further development of the smart grid, the modern power system has evolved into a cyber-physical power system (CPPS). In order to accurately quantify the resilience of a CPPS under cyber attacks, in this article, a resilience evaluation method for the CPPS considering the whole process of cyber attacks is proposed. First, the calculation model of successful attack probability is proposed based on the Markov node transition probability matrix and depth-first search algorithm. Second, based on the idea of nonsequential Monte-Carlo simulation, a mixed sampling method is proposed to determine the fault occurrence time and repair time of each circuit breaker in the fault set. In order to describe the change process of load after a successful attack, the response model of the power system is proposed using the optimal load reduction model based on the dc power flow. Four resilience evaluation indices for attack …

See List of Professors in Xiaoqiang Guo University(Yanshan University)

Xiaoqiang Guo FAQs

What is Xiaoqiang Guo's h-index at Yanshan University?

The h-index of Xiaoqiang Guo has been 35 since 2020 and 42 in total.

What are Xiaoqiang Guo's top articles?

The articles with the titles of

Passivity-Based Nonsingular Terminal Sliding-Mode Control for LC-Filtered Current Source Converter

Coordinated Control Strategy for Cascaded Current-Source Converter Under Unbalanced Grid Voltage

Application status of variable-frequency drive in hydrogen fuel cell air compressors from an industrial viewpoint: A review

A Novel DC–DC Converter for Electrolyzer With Low Ripple and High Step Down

An Overlap-Time Effect Elimination SVM Based on Vector Bridge Extension for Current-Source Converter

Insights into the mechanism of electric field regulating hydrogen adsorption on Li-functionalized N-doped defective graphene: A first-principles perspective

Electrically enhanced adsorption efficiency of aluminum nitride nanotube for sulfate ion removal from water

A High-Voltage Gain Transformerless GridConnected Inverter

...

are the top articles of Xiaoqiang Guo at Yanshan University.

What are Xiaoqiang Guo's research interests?

The research interests of Xiaoqiang Guo are: Power electronics for microgrid and smartgrid

What is Xiaoqiang Guo's total number of citations?

Xiaoqiang Guo has 6,654 citations in total.

What are the co-authors of Xiaoqiang Guo?

The co-authors of Xiaoqiang Guo are Dragan Maksimovic.

    Co-Authors

    H-index: 93
    Dragan Maksimovic

    Dragan Maksimovic

    University of Colorado Boulder

    academic-engine

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