Table of Content

30 March 2025, Volume 0 Issue 3

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Research & Analysis

Study on Motion Characteristics of Multiple Valves During Breaking Process of Large-Capacity Self-Blast Circuit Breaker

CHEN Shizhe, WANG Zhoujing, SHI Yuying, MOU Yuze, LI Xingwen

2025, 0(3):  1-5.  doi:10.16628/j.cnki.2095-8188.2025.03.001

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The rated short-circuit breaking current of 550 kV switches in China urgently needs to be increased from 63 kA to 80 kA. Moreover, the self-blast circuit breakers have great advantages in large-capacity breaking. By constructing a magnetohydrodynamics model considering the continuous motion of multiple valves, a simulation analysis of the arc breaking process for a 550 kV self-blast circuit breaker under short-circuit currents of 63 kA and 80 kA is carried out. The force and motion characteristics of the check valve, the gas return valve and the pressure relief valve are obtained. The study shows that the force characteristics of each valve are similar under different short-circuit currents. The larger the short-circuit current is, the earlier the closing time of the check valve is, the higher its motion speed is, with a peak value of 25.5 m/s, and the more sufficient the mixing of hot and cold gases in the expansion chamber is. The gas return valve remains stationary relative to the right side wall during the arcing stage. The pressure relief valve makes a reciprocating motion on the right side of the initial position after 3.90 ms of arcing, and the farthest distance can reach 339.54 mm.

Simulation Analysis Method of Contact Resistance Considering Characteristics of Rough Contact Surfaces

WU Chengchuang, ZHOU Yu, ZHANG Chao, REN Wanbin

2025, 0(3):  6-10.  doi:10.16628/j.cnki.2095-8188.2025.03.002

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Contact resistance is a critical parameter in low voltage control apparatus. Firstly, based on the collation of the theoretical model of electrical contact, a simulation analysis method of contact resistance considering the characteristics of rough surfaces is proposed.Then, the dependence relationships among the characteristics of the contact area,contact resistance and pressure load are explored.Finally,by comparing the results of contact resistance calculations with those for smooth surfaces, it is confirmed that the contact spots exhibit singular change with the pressure loads, which is the fundamental reason for the nonlinear change of the contact resistance.

Research on Operation Optimization of Integrated Energy System in Industrial Park Considering Electricity-Gas Bidirectional Coupling

LIU Zhaoxin, WANG Han, ZHANG Yunxiao, SONG Yikai, ZENG Bo, SUN Zhiquan

2025, 0(3):  11-20.  doi:10.16628/j.cnki.2095-8188.2025.03.003

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Aiming at the problems of low energy utilization rate and serious waste of wind power in the complex energy systems in the industrial parks, an operation optimization method of wind-solar-hydrogen-storage integrated energy system considering electricity-gas bidirectional coupling is proposed.Firstly, an integrated energy system model of industrial park considering electricity-gas bidirectional coupling is established.Secondly, a multi-objective function is established with the total cost of the system, operating energy efficiency, carbon emissions, etc., as the optimization objectives, and the constraints such as equipment, tie lines, and power balance are considered.Finally, the Pareto frontier is used to transform the multi-objective problem into a single-objective problem, and the dynamic differential evolution algorithm is used to calculate and analyze the three operation modes of the industrial park.The simulation results show that the proposed method effectively promotes the wind power consumption in the industrial park, improves the comprehensive energy utilization efficiency of the park,enhances the environmental protection property and flexibility of the system operation, and reduces the total cost of the system operation.

Robust Optimization Method of New Energy Accommodation in Flexible Interconnected Distribution Network Considering Network Reconfiguration

ZHENG Zhen, MA Xiaoli, SHEN Xiaofeng, YAN Huamin, MA Taotao, YAN Zhan, XING Haijun

2025, 0(3):  21-30.  doi:10.16628/j.cnki.2095-8188.2025.03.004

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With the popularization of renewable energy,the consumption of new energy in the distribution network has become a major problem.Considering the application background of flexible interconnection devices in large cities,in order to improve the accommodation capacity of distribution network,a robust optimization method of new energy accommodation capacity of flexible interconnection distribution network considering network reconfiguation is proposed.Firstly,the principle of soft open point (SOP) and network reconfiguration is analyzed.Secondly,a new energy accommodation capacity model considering SOP and network reconfiguration is established,and the nonlinear model is transformed into a second-order cone programming model by the convex relaxation technology.Then,considering the uncertainty of new energy output,a two-stage robust optimization model is established and solved by the column-and-constraint generation (C&CG) algorithm.The effectiveness of the algorithm is verified on the IEEE 33-node system.The results show that the cooperative optimization of SOP and network reconfiguation helps to improve the new energy accommodation capacity of medium voltage distribution network.

Prediction Technology

Battery State of Health Prediction and Optimization by Combining CatBoost Algorithm and ARIMA Model

MA Lingqi, ZOU Hairong, LI Xingjia

2025, 0(3):  31-37.  doi:10.16628/j.cnki.2095-8188.2025.03.005

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For the prediction of the battery state of health (SOH), an SOH estimation method that integrates the categorical boosting (CatBoost) algorithm and the autoregressive integrated moving average (ARIMA) models is proposed. The features are extracted through time series analysis, and the residuals of the ARIMA model are obtained. These residuals are used as additional features and processed by the CatBoost algorithm to construct an enhanced dataset for prediction.The experimental results demonstrate that the prediction performance is significantly enhanced by the proposed method.The optimal root mean square error (RMSE) reaches 0.004 6, the mean absolute error (MAE) reaches 0.003 4, and the coefficient of determination (R²) reaches 0.999 4. Compared with the model using only the initial data, it has higher accuracy and stability.

Research on Power Prediction Characteristics of New Energy Based on Sensitive Meteorological Feature Factor Screening and PSO-SVM Model Optimization

GONG Weizheng

2025, 0(3):  38-45.  doi:10.16628/j.cnki.2095-8188.2025.03.006

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With the continuous construction of new power systems, it is extremiy urgent to study the correlation characteristics between new energy power and meteorology.A new energy power rolling prediction algorithm based on sensitive meteorological factor feature screening and PSO-SVM model optimization is proposed.Firstly,based on the Pearson correlation coefficient and mutual information entropy,the correlation characteristics between meteorological factors and new energy power are analyzed.Based on the D-S evidence theory,the optimized combination of correlation indicators is calculated to screen sensitive meteorological feature factors.The particle swarm optimization (PSO) algorithm is used to globally optimize the parameters of the support vector machine (SVM) new energy power generation prediction model.Then,combined with massive new energy operation data, a rolling prediction model is established.Finally,through experimental verification and analysis,the results show that the proposed prediction model can effectively improve the accuracy of new energy generation prediction.

Research on Model Predictive Control for Grid-Connected Inverter Based on Adaptive Error Correction

WANG Yi, WANG Xiaochen, XIE Qun, ZOU Yifan, LÜ Jianguo

2025, 0(3):  46-53.  doi:10.16628/j.cnki.2095-8188.2025.03.007

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A model predictive control (MPC) method for the grid-connected inverter based on adaptive error correction is proposed to address the problem that the grid-connected inverter based on the finite control set model predictive control (FCS-MPC) experience prediction current errors, and the mismatch of filter inductance parameters can further exacerbate these errors. Firstly, a model of the grid-connected inverter based on FCS-MPC is established, and the causes of the prediction current errors are studied. Then, an error correction link is added to the current prediction model. By using the extended Kalman filter (EKF) to identify the filter inductance parameters in real time, the MPC reference current can be adaptively corrected when the inductance parameters are mismatched, and the harmonic components of the grid-side current can be suppressed. Finally, the effectiveness of the proposed method is verified by simulations.

Prediction of Remaining Useful Life of Switches Based on Voiceprint

SONG Biying, CAI Zhiyuan

2025, 0(3):  54-63.  doi:10.16628/j.cnki.2095-8188.2025.03.008

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For the prediction of the remaining useful life of the 5.3 A control and protection switch, it is found that with the performance degradation of the switch, the contact bounce phenomenon becomes more and more obvious, and the reaction characteristics of the switch also changes.Through the change of contact bounce,the sound signal is related to the spring stiffness and other characteristics of the switch.Through the change of the reaction force characteristics,the electrical life of the switch is related to the spring stiffness and other characteristics of the switch,so as to link the sound signal with the electric life.The remaining service life of the switch can be predicted by the change trend of the sound signal. The experimental results show that the recognition accuracy of voiceprint based on the electrical life of 0,100,120 000 and 160 000 times is 96.40%,which has guiding significance for the replacement of the switch. Moreover,due to the non-contact characteristics of voiceprint monitoring, it has reference significance for the maintenance of high voltage equipment.

Electrical Design & Discussion

Study on Short-Circuit Breaking Technology for Residual Current Operated Circuit Breaker in JP Cabinet

WANG Huazhang, DU Tianwa, GAO Jincai, LI Bingquan, ZHANG Chuncheng

2025, 0(3):  64-69.  doi:10.16628/j.cnki.2095-8188.2025.03.009

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Low short-circuit breaking capacity plays essential role for the residual current operated circuit breaker (RCB) sample testing in JP cabinet,which is required that the first pass yield (FPY) should be 100%.It is necessary to ensure the reliability of the low breaking capacity.By comparing with a few types of static contacts,U-shape static coutact of bottom incoming line is defined to be suitable for low breaking capacity,which can increase the electromagnetic repulsion force and shorten the breaking time.Gas blowing can accelerate the transfer of the arc,increase the arc voltage,and prevent the back breakdown.The contact pressure is adjusted to avoid critical breaking.The critical point of the small frame is limited outside the sampling inspection range,and the large frame is completely broken by the instantaneous tripping operating mechanism.The shorter the instantaneous tripping time is,the faster the breaking speed is. Through the comparative test of short-circuit breaking,the U-shaped static contact,gas blowing, contact pressure and instantaneous tripping time can improve the stability of low breaking capacity.

Research on Optimization of Normally-Closed Contacts Adhesion for High-Power Transfer Contactors

CHEN Jun, LIU Juntang, QIU Guojian, MA Hui, ZHANG Ding

2025, 0(3):  70-75.  doi:10.16628/j.cnki.2095-8188.2025.03.010

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Based on the extensive engineering experience,it is known that the reliability of the normally-closed contacts of high-power transfer contactors is lower than that of the normally-open contacts.The adhesion of the normally-closed contacts is an important cause of the failure of high-power transfer contactors.Firstly,taking the high-power transfer contactor as a research object,the fault tree analysis is carried out in accordance with the problems encountered during the testing.It is determined that the poor weld-resistance performance of the contact material and insufficient electromagnetic attraction force are the main causes of the adhesion failure of the contacts of high-power transfer contactors.Subsequently,by replacing the contact material and optimizing the processing methods,the weld-resistance performance of the contacts is enhanced.Meanwhile,the design of the electromagnetic system is optimized to reduce the magnetic gap and increase the electromagnetic attraction force.Finally,the life test and other verifications are conducted on the samples with the optimized solutions.The test results show that the optimized solutions are effective and solve the problem of the adhesion of the normally-closed contacts of high-power transfer contactors.

Design of Heat Dissipation Structure for 40.5 kV/4 000 A SF₆ Cubicle Gas Insulated Switchgear

LONG Yuanyan, YANG Beisi, LI Junhao, WANG Guangxian

2025, 0(3):  76-80.  doi:10.16628/j.cnki.2095-8188.2025.03.011

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Through the analysis of the heating and heat dissipation mechanisms of the cubicle gas-insulated switchgear (C-GIS), the eddy current simulation of the main electrical circuit of the 40.5kV/4 000A equipment is completed, and the design of the conductor of the main electrical circuit is optimized. Through increasing the thickness of the main conductor by 3mm, the eddy current loss is reduced, and the single-phase resistance of the circuit decreases from 34 μΩ to 22 μΩ. According to the temperature rise simulation of the main electrical circuit, the heating position of the circuit breaker pole is determined, the heat dissipation structure is analyzed, the gas convection air duct is improved, and the gas convection situation inside and outside the switchgear cabinet is simulated. The prototype of the switchgear is manufactured and a temperature rise test is carried out. The results show that the maximum temperature rise reduction of the static terminals of the circuit breaker with the improved pole heat dissipation scheme is approximately 15.4 K under the condition of forced air cooling.