Jianxin Zhu

Nanjing University of Posts and Telecommunications

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Yan Xing

Heilongjiang Earthquake Agency

Hongfei Wu

Nanjing University of Aeronautics and Astronautics

Jiangfeng Wang

Southeast University

Haibing Hu

Nanjing University of Aeronautics and Astronautics

Xinfang Zhang

Zhengzhou University of Aeronautics

Li Zhang

Hohai University

Ming Hua

Bengbu Medical College

Junyu Chen

National United University

Daorong Lu

Nanjing Normal University

Fan Wu

Fujian Electric Power Survey & Design Institute

Cooperative Institutions

Nanjing University of Aeronautics and Astronautics

Chinese Academy of Sciences

Zhejiang University

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Xi'an Jiaotong University

Fudan University

Central South University

Jilin University

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Evaluation of Voltage Controllers Based on Active Damping for the CVCF Power Converter under Nonlinear Load Condition

2022 IEEE Energy Conversion Congress and Exposition (ECCE) (2018)

Jianxin Zhu Li Zhang Rui Zhao Fan Wu Yan Xing

The constant voltage constant frequency (CVCF) power converter for railway power supply system requires accurate output voltage. The necessary condition to achieve zero steady-state error voltage control for CVCF converter is deduced. Then the inherent relationship among different AC controllers is presented in this paper. To compare the performance and implementation of the reduced order generalized integrator (ROGI), the proportional resonant (PR) and the repetitive control (RC), a neutral point clamped (NPC) single-phase three-level CVCF inverter prototype with active damping control is built and tested. The recommendation on controller selection is given for different applications.

Constant (computer programming)

10.1109/ecce.2018.8557506

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Citations (1)

A GaN-based High Power Density Power Optimizer for Solar-Powered Aircraft Applications

2021 IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia) (2021)

Peng Chen Tao Liu Yujie Cheng Hongfei Wu Jianxin Zhu

The energy management system is the control center of a solar-powered aircraft. The most important concerns of the energy system are conversion efficiency and power density and. Considering the requirements of power density and efficiency, a high frequency planar inductor for a GaN-based four-switch buck/boost (FSBB) converter is designed. At the same time, the parameters of the converter are optimized to determine switching frequency. Considering the MPPT of solar panel and battery charging management, the control strategy for the FSBB converter is presented. Working modes can be switched smoothly with the dynamic switching frequency changing. Finally, a 400W solar power optimizer is built. The power density of the power optimizer is 750W/inch ³ and the highest efficiency is up to 97.6%.

Power density

Solar powered

Solar Power

Buck converter

Maximum power principle

10.1109/wipdaasia51810.2021.9656078

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Dynamic voltage‐sharing among series‐connected IGBTs during turning‐on process

Electronics Letters (2019)

Jianxin Zhu Yan Xing Shun Ding Haibing Hu

An active clamping circuit for voltage sharing among series‐connected insulated gate bipolar translators (IGBTs) during turning‐on process is proposed at first, which detects the C–E voltage of the leading IGBT and generates gate pumping current to slow down the turning‐on speed, and thus reduces the voltage difference between the IGBTs. Then, a turn‐on edge regulation algorithm for the driving signal is proposed, which further reduces the voltage spike and turn‐on power loss, and optimises the regulation speed. A time detection circuit is introduced to detect the pulse signal indicating the working time of the active clamping circuit for driving signal regulation. The turn‐on edge regulation for each IGBT is determined by the feature that the rising edge of the detected pulse signal coincides with the corresponding IGBT turn‐on edge delay. The experimental results prove the feasibility and effectiveness of the proposed method.

Power sharing

10.1049/el.2019.0739

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Method for Judging Output Limit Value of Addition and Subtraction Force of Thermal Power Unit Based on Data Analysis

DEStech Transactions on Computer Science and Engineering (2019)

Weichun Ge Qili Huang Jianxin Zhu Jianguo Wang Qun Chen

For a high proportion of wind power connected to the power grid, if it is a dry season, the peak regulation of the power grid only depends on thermal power, but the upper and lower limits of thermal power regulation often do not match the actual situation. Therefore, the paper proposed to use the historical data of the output of the thermal power unit to dynamically calculate the upper and lower limits of the output of the thermal power unit, and obtained the margin of added and subtracted output forces of thermal power units, thus judging the critical state of energy storage input and wind abandonment in power grid, which providing a theoretical basis for predicting the capacity of thermal power units to add and subtract output forces, energy storage input and wind abandonment conditions. Combined with the actual example, the dynamic calculation the upper and lower limits of e output and total power generation of the thermal power unit are basically consistent with the given upper and lower limits value, indicating that the limits calculated by this method are in line with the actual requirements of the grid operation; The energy storage input and abandonment criteria proposed in the paper are also consistent with the actual operation of the power grid, and have practical guiding significance for the power grid with large-scale wind power access and large-scale energy storage.

10.12783/dtcse/msota2018/27562

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Clustered Voltage Balancing Mechanism and Its Control Strategy for Star-Connected Cascaded H-Bridge STATCOM

IEEE Transactions on Industrial Electronics (2017)

Daorong Lu Jiangfeng Wang Jianhui Yao Sen Wang Jianxin Zhu

To explore the clustered voltage balancing mechanism of the star-connected cascaded H-Bridge (SCHB) STATCOM, this paper analyzes the relationship between the active power and the control variables-modulation reference voltages in a dq frame through positive and negative sequence component decomposition. The derived relationship in the dq frame reveals that the negative sequence modulation reference voltage is capable of redistributing the active power among three phases and also the SCHB STATCOM features the clustered voltage self-stabilizing without any additional clustered voltage balancing control. To eliminate the differences of three clustered voltages, a new clustered voltage balancing control is proposed by regulating negative sequence modulation reference voltage in the dq frame. Its balancing mechanism is analyzed in detail and a simple implementation is presented as well. The effectiveness of the proposed control is verified by experimental results on a 400 V/15 kvar SCHB STATCOM.

H bridge

Modulation (music)

Sequence (biology)

Star (game theory)

10.1109/tie.2017.2694390

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Citations (54)

A fully FPGA-based real-time simulator for the cascaded STATCOM

2022 IEEE Energy Conversion Congress and Exposition (ECCE) (2016)

Jianxin Zhu Guodong Teng Qin Yang Daorong Lu Haibing Hu

A real-time simulation for the Cascaded STATCOM fully implemented on field-programmable-gate-arrays (FPGA) is proposed in this paper. The switching-function model for the STATCOM is employed, where the IGBTs and diodes are taken as ideal switches, to reduce the amount of calculation. With the help of external circuit calculation, the operation in dead-time period is taken into consideration, which makes all of the operation modes covered. To eliminate the reverse current of diode in discretized simulation, a simple measure and approximation is taken by setting the negative calculated current zero. Full parallelism and deep pipelining are employed in FPGA implementation to minimize the latency. To make a full comparison, a Simulink-based STATCOM model and a 30A 380V scale-down STATCOM prototype were built respectively. The simulation and experiment show that the results from real-time simulator match those from Simulink model and the prototype pretty well, which demonstrate the effectiveness of the proposed real-time simulator for the Cascaded STATCOM.

Gate array

10.1109/ecce.2016.7854682

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Citations (5)

Efficient peroxydisulfate activation with γ-Al2O3-C-MIL-100(Fe) framework for sulfamethazine degradation: Enhanced oxidant utilization and reduced metal leaching

Applied Catalysis B Environment and Energy (2024)

Jianxin Zhu Haiyang Liu Haijun Chen Xiuyi Hua Deming Dong

Peroxydisulfate

Degradation

10.1016/j.apcatb.2024.124520

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Citations (2)

Simulation Research of Shunt Three Phase Active Power Filter

Jisuanji fangzhen (2007)

Jianxin Zhu

Aiming to the problem of harmonics and low power factor caused by widely-used nonlinear load, and according to the mathematic mode of shunt three-phase active power filter, a shunt three-phase active power filter based on fuzzy-sliding mode variable structure control strategy which was by incorporating the sliding mode variable structure control and fuzzy control reaching-law was designed to suppress the harmonics and improve power factor. It could not only eliminate the chattering of sliding model variable structure control and make system have strong robustness against model uncertainties and external disturbance, but could also improve the character of reaching segment and tracking errors converge to a range of zero, This control method was verified by simulation, and the results of simulation show the control method is feasible, and have good dynamic and static performance in this system.

Robustness

Source

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Implementation and Time Performance Analysis of Security Suite in LR-WPAN 802.15.4

Jianxin Zhu Leina Gao Xinfang Zhang

In recent years, short-range wireless communication becomes a hotspot in wireless industry, which can be widely used in constructing the wireless sensor network of military, industrial control, precise agriculture and medical monitoring. It will play an important role with the coming ubiquitous computing age. Focusing on LR-WPAN 802.15.4, this paper introduces its security architecture and presents an input block model based on the underlying AES encryption algorithm and generic CCM mode when implementing AES-CCM security suite. An experiment compared with traditional DES on time performance is carried out and the results show better efficiency and security strength in AES-CCM.

Hotspot (geology)

10.1109/wicom.2008.1115

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Citations (4)

A Three-Phase AC/DC Power System with Paralleled Active and Passive Rectifiers for Low-Frequency Pulsed Load Applications

Junyu Chen Hongfei Wu Jianxin Zhu Lin Li Yan Xing

A hybrid three-phase AC/DC power system composed of a passive rectifier and an active two-stage AC/DC rectifier is researched for low-frequency pulsed load applications. The non-pulsation part of the load power is processed by the passive rectifier while the pulsation part is regulated by the active rectifier. Therefore, both high efficiency and high reliability is achieved by adopting the hybrid structure. Meanwhile, with the help of the active rectifier, the high peak value pulsed power is decoupled with the AC source, and the high frequency harmonics generated by the passive rectifier is compensated as well. As a result, the negative impact of the pulsed power on the AC source is suppressed effectively. The operation principles of hybrid AC/DC power system and its control strategy is analyzed and investigated in detail. A prototype is built and tested to verify the effectiveness and feasibility of the hybrid AC/DC power system.

Rectifier (neural networks)

Precision rectifier

Three-phase

10.1109/ipemc-ecceasia48364.2020.9368109

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Citations (5)