Table of Content

30 June 2025, Volume 0 Issue 6

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Research & Analysis

Research on Fast DC Interruption Technology Based on Piezoelectric Actuator

LIU Yu, Mohmmad AL-DWEIKAT, ZHANG Guogang

2025, 0(6):  1-6.  doi:10.16628/j.cnki.2095-8188.2025.06.001

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With the increasingly widespread application of DC power systems, the problems caused by short-circuit faults have become more prominent. The DC short-circuit fault current rises rapidly and lacks a natural zero-crossing point. The transient large current generated by short-circuit fault poses great harm to power equipment and puts forward higher requirements for the breaking speed of DC switches. Aiming at this problem, a structure of fast mechanical switch based on piezoelectric actuator (PA-FMS) is proposed. By adopting a hybrid switch scheme, the fast DC interruption is achieved. In view of the working characteristics of the piezoelectric actuator, the constant-current drive circuit is designed. Through the optimization of circuit parameters, the overshoot and rebounce of the moving contact are reduced. A hybrid DC circuit breaker experimental system is constructed. The test results show that the fault current transfer time of hybrid DC circuit breaker is about 200 μs, and the full breaking time is less than 800 μs.

Study on Influence of Potting on Near-Field Coupling of Magnetic Elements in EMI Filters

HUANG Ju, LI Huanhuan, MAO Xingkui, DONG Jiqing

2025, 0(6):  7-16.  doi:10.16628/j.cnki.2095-8188.2025.06.002

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To address the issue of degraded filtering performance in electromagnetic interference (EMI) filters after potting, a near-field coupling equivalent model of the filter considering both electric field coupling and magnetic field coupling is established. The near-field coupling equivalent parameters of magnetic elements are extracted before and after potting. The parameter extraction results show that potting can affect the self-parasitism effect of the filter and the near-field coupling effect between magnetic elements. Then, the sensitivity analysis of the near-field coupling equivalent parameters of the magnetic elements before and after potting is carried out. The results show that the change of the insertion voltage gain of the filter before and after potting is mainly caused by the change of equivalent capacity parameters of the magnetic elements which are greatly affected by the near-field coupling. The influence mechanism of the near-field coupling of the magnetic elements after potting is further clarified. Finally, a partial potting method is proposed to improve the conduction EMI noise, and the effectiveness of partial potting is verified by experiments.

Calculation and Analysis of Arc Pressure Rise in AIS Cable Compartment

GUO Qing

2025, 0(6):  17-21.  doi:10.16628/j.cnki.2095-8188.2025.06.003

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Based on the heat conduction equation, the fluid governing equation and the ideal gas equation, the arc power is loaded into the control equation of fluid motion by the internal heat source method. A numerical model for calculating the arc pressure in the cable compartment of switchgear is established. When an arc fault occurs at the copper busbar in the cable compartment, the three-dimensional gas flow field in the cable compartment is numerically calculated. The pressure rise distribution law and the propagation characteristics of the pressure shock wave in the cable compartment during the initial stage of the arc are pointed out. Finally, based on GB/T 3906—2020, a 40 kA, 1 s internal arc test is conducted on the product, The results show that the numerical calculation results of the pressure field are in good agreement with the test results. The error meets the engineering requirements. This provides theoretical support and design reference for the subsequent design and optimization of similar products.

Non-Intrusive Load Identification Method for Unknown Added Devices Based on Adversarial Discriminative Domain Adaptation

HE Sheng, YANG Haowen, ZHAO Jingbing

2025, 0(6):  22-31.  doi:10.16628/j.cnki.2095-8188.2025.06.004

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Aiming at the problem that the differences in signal characteristics between different electrical devices lead to the decrease in accuracy and insufficient generalization ability of traditional non-intrusive load recognition methods when facing unknown additional devices, a migration learning method based on the adversarial Discriminative domain adaptation (ADDA) is proposed. First, the multi-dimensional feature parameters of different devices are extracted by combining feature selection methods, and the source domain models are trained using the source device feature data. Then, an adversarial training strategy is employed, with a discriminator introduced to optimize the feature extractor of the target device. Finally, the model is fine-tuned and optimized to complete the load recognition task on the target device. Experimental results show that the optimized recognition model achieves an average accuracy of 98.90%, an improvement of 18.41% compared to the traditional migration learning methods.

PFC Optimization Modulation Strategy for Bidirectional Resonant Converter of V2G Charging Station

HUI Qi, ZHANG Jianwei

2025, 0(6):  32-37.  doi:10.16628/j.cnki.2095-8188.2025.06.005

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To improve the integration and performance of the bidirectional converter for electric vehicle bidirectional charging stations, a single-stage resonant three-port bidirectional converter with V2G, G2V and H2L modes is proposed. First, the equivalent model of the converter is established, and the mathematical model for the output power is derived. Then, the working modes of the converter are analyzed, and the resonant cavity current is designed. An optimized modulation strategy is proposed that balances low current stress and power factor correction(PFC)on the grid side. Finally, simulation analysis is conducted under PLECS. The results show that the converter achieves a high power factor on the grid side under both forward and reverse operating conditions while maintaining low current stress. The proposed optimization modulation strategy helps to improve the converter’s efficiency and the utilization rate of electrical energy in the power supply lines.

Electrical Design & Discussion

Research on a Novel Active Clamp Bidirectional High Ratio DC/DC Circuit

WANG Liang, XU Yuzhen, TANG Jianbin

2025, 0(6):  38-43.  doi:10.16628/j.cnki.2095-8188.2025.06.006

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In order to solve the problem of voltage spikes and increased voltage stress caused by the coupling inductance gain unit in the DC/DC circuit, a novel active clamp bidirectional large ratio DC/DC circuit is proposed.The proposed circuit not only realizes a large proportion voltage transformation, but also effectively absorbs the leakage energy of the coupling inductance by using the active clamp circuit, thereby the voltage stress of the power switching transistor is reduced. To verify the effectiveness of the circuit, an experimental prototype with a low-voltage side of 48 V, a high-voltage side of 400 V and a power of 200 W is designed. The experimental results show that the proposed circuit can successfully achieve a large proportion voltage transformation and reduce the voltage stress of the power switching device. The feasibility and effectiveness of the circuit design is verified. New ideas and methods for the design of DC/DC circuits are provided.

Original article

Design of High Power Density Radiation-Hardened POL Power Supply

OU Changjiang, YANG Zhengnan

2025, 0(6):  44-50.  doi:10.16628/j.cnki.2095-8188.2025.06.007

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In view of the increasing integration of space systems and the demand of larger integrated circuits for highpower density and miniaturized radiation-hardened point of load(POL) power supply, a design scheme for the high power density dual-circuit radiation-hardened POL power supply is proposed. The circuit design,components selection, structural and technological design are described separately.Through simulations aualysis, analog experiments,sample testing and evaluation tests, the ratiouality of the design is verified. The power density of radiation-hardened POL power supply significantly exceeds that of traditional power supply. In the case of the limited area of the single machine and the integration in space system, it can provide a miniaturized and lightweight high-power radiation-hardened POL power supply platform.

Design and Simulation Analysis of Undervoltage Release for MCCB

LI Xiankai, XU Jiangning

2025, 0(6):  51-55.  doi:10.16628/j.cnki.2095-8188.2025.06.008

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As a critical accessory for molded case circuit breaker (MCCB), the undervoltage release plays a vital protective role by reliably tripping the circuit breaker upon abnormal voltage drops, safeguarding circuits and equipment. Aiming at the problem of insufficient action reliability of the traditional self-holding type and auxiliary-holding type undervoltage releases in high-temperature environments, the structural design key points of the self-holding type undervoltage release are elaborated in detail, and the dynamic characteristics are deeply simulated and analyzed based on Ansys software. The design scheme is effectively verified by the method of combining simulation and testing. The results demonstrate that the optimized undervoltage release significantly enhances its actuation reliability under high-temperature and other harsh operating conditions, thereby effectively improving the undervoltage protection performance of MCCB.

Research on Optimization of Stabilization Treatment Process Methods for Electromagnetic Relay

CHEN Jun, YANG Nan, ZHAO Chengwei, WU Shengxiu, ZENG Qinwu

2025, 0(6):  56-59.  doi:10.16628/j.cnki.2095-8188.2025.06.009

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As a key component widely used in various electrical control systems, the performance stability of electromagnetic relay is directly related to the reliable operation of the systems. An study of the stabilization treatment process of electromagnetic relay is focused on. By comprehensively analyzing the existing processes, problems such as inaccurate processing parameters, lack of comprehensive consideration of multiple factors, and low process efficiency are identified. Furthermore, by combining experimental and theoretical analysis, the effective methods for optimizing the stabilization treatment process are systematically explored. The aim is to comprehensively improve the performance stability and reliability of electromagnetic relay, providing the reference for the product research.

Application

Research and Application of Blockchain-Based Management Technology for Power System Stability Control Device

FAN Xinye, LIU Jian, QIAO Jibin, LIU Dong

2025, 0(6):  60-68.  doi:10.16628/j.cnki.2095-8188.2025.06.010

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In response to the control problems faced by the current stability control system, such as data being easily tampered with, records being difficult to trace, unreliable data and difficulties in updating and synchronizing, the blockchain technology is utilized to introduce blockchain technology into the entire management process of stability control devices to solve the control problems of stability control data verification, certification and traceability. Firstly, a blockchain architecture for the stable control device management is designed. Secondly, the key technology research is conducted on the construction of a stable control chain. Finally, through the experimental verification and analysis, the performance of the stable control chain, such as certification efficiency, consistency verification and consensus efficiency, is analyzed. The results show that the designed stable control chain has functions such as efficient certification of key business data on the chain, trustworthy traceability and consistency verification, which can improve the level of safe and stable operation of the power grid.

Development and Application of Electromagnetic System Simulation Analysis Platform for Magnetic Latching Relay

ZHANG Linliang, CHEN Jianyi, ZHENG Xubin, LIU Xiangjun

2025, 0(6):  69-77.  doi:10.16628/j.cnki.2095-8188.2025.06.011

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To address the issue of time-consuming repetitive tasks such as modeling, material addition and solution settings for the electromagnetic system simulation analysis of different models of magnetic latching relay, an electromagnetic field simulation analysis platform for electromagnetic systems is developed based on the MATLAB App Designer software platform. The secondary development is carried out on the pre-processing and post-processing modules of the electromagnetic field analysis software Maxwell. Through creating a user-friendly human-computer interaction platform, Maxwell is called for parameterized modeling and numerical simulation solution. This designed platform is used to analyze the effects of the air gap of the armature assembly, the armature chamfer and the distance between the yoke and the magnet steel on the electromagnetic torque. The simulation results show that the air gap between the armature and the magnet steel reduces the permanent magnetic holding force. Appropriately increasing the armature chamfer helps to enhance the permanent magnetic holding force. When the distance between the yoke and the magnet steel is small, it is beneficial for the magnetic latching relay to act ealier, but the permanent magnetic holding force will be reduced.