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Reactive Power Optimization Model of Active Distribution Network with New Energy and Electric Vehicles

Energy Engineering 2025年第3期122卷 985-1003页

作者： Chenxu Wang Jing Bian Rui Yuan Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control&Renewable Energy TechnologyMinistry of EducationJilin132011China

Considering the uncertainty of grid connection of electric vehicle charging stations and the uncertainty of new energy and residential electricity load,a spatio-temporal decoupling strategy of dynamic reactive power optimization based on clustering-local relaxation-correction is ***,the k-medoids clustering algorithm is used to divide the reduced power scene into ***,the discrete variables and continuous variables are optimized in the same period of ***,the number of input groups of parallel capacitor banks(CB)in multiple periods is fixed,and then the secondary static reactive power optimization correction is carried out by using the continuous reactive power output device based on the static reactive power compensation device(SVC),the new energy grid-connected inverter,and the electric vehicle charging *** to the characteristics of the model,a hybrid optimization algorithm with a cross-feedback mechanism is used to solve different types of variables,and an improved artificial hummingbird algorithm based on tent chaotic mapping and adaptive mutation is proposed to improve the solution *** simulation results show that the proposed decoupling strategy can obtain satisfactory optimization resultswhile strictly guaranteeing the dynamic constraints of discrete variables,and the hybrid algorithm can effectively solve the mixed integer nonlinear optimization problem.

关键词： Active distribution network new energy electric vehicles dynamic reactive power optimization kmedoids clustering hybrid optimization algorithm

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HEALTH EVALUATION OF TRANSMISSION MECHANISM IN POWERTRAIN BASED ON COMPOSITE WEIGHT CLOUD MODEL 10

HEALTH EVALUATION OF TRANSMISSION MECHANISM IN POWERTRAIN BA...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Wang, Liyong Huang, Xiaozan Wu, Jianpeng Yang, Jian Zhang, Jinle Li, Pengpeng Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China China North Vehicle Research Institute Beijing China

ISBN: (纸本)9781837242672

The performance degradation of the powertrain in service significantly affects the stability and reliability of tracked vehicles. To assess the powertrain health state of tracked vehicles, this study proposes a health state evaluation method for the transmission mechanism of the powertrain based on a composite weight cloud model. Firstly, the model establishes a health evaluation indexes system for the transmission mechanism, calculates the subjective index weights based on the AHP method and utilizes the EWM-CRITIC method to compute the objective index weights. However, the subjective and objective weights have some limitations. Therefore, the weights of subjective and objective indexes are fused through the game theory to obtain the composite weights of indexes. Secondly, this research categorizes the health status levels of the transmission mechanism to establish an evaluation standard cloud model and combines index weights and data to generate a comprehensive cloud model. Then, the cloud memberships are calculated for different mileage comprehensive clouds to quantitatively analyse the cloud model. Finally, the feasibility of the composite weight cloud model health evaluation method is verified by comparing it with other health evaluation methods, which provides a reference for the health state evaluation of the powertrain. © The Institution of Engineering & technology 2024.

关键词： CLOUD MODEL HEALTH EVALUATION SUBJECTIVE AND OBJECTIVE WEIGHTS TRANSMISSION MECHANISM

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THE TORQUE PREDICTION OF HEAVY-DUTY VEHICLE DRIVESHAFT BASED ON MSGWO-LSTM 10

THE TORQUE PREDICTION OF HEAVY-DUTY VEHICLE DRIVESHAFT BASED...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Wu, Jianpeng Zhao, Peng Song, Yaochen Wang, Liyong Zhang, Jinle Huang, Xiaozan Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science & Technology University Beijing China China North Vehicle Research Institute Beijing China

ISBN: (纸本)9781837242672

The driveshaft is the core component in the driveline system of Heavy-Duty Vehicles (HDV). Its torque transfer performance is related to the operational capability. The torque prediction is of great significance for studying the dynamics of HDV. Therefore, this paper proposes a driveshaft torque prediction model using a Multi-Strategy Grey Wolf Optimizer (MSGWO) to optimize the Long Short-Term Memory (LSTM) network. First, a torque calculation method based on real vehicle sensing data is proposed to provide samples for neural network training. Second, the MSGWO is used to optimize the hyperparameters of LSTM to construct the prediction model based on MSGWO-LSTM. Finally, the model is validated using a dataset composed of real vehicle sensing data and calculated torque. Compared to GWO-LSTM, LSTM, and Backpropagation (BP) models, the MSGWO-LSTM model proposed in this paper reduces the RMSE of real-time shifting torque prediction values by 41.59%, 66.14%, and 86.78%, respectively. The RMSE of short mileage prediction value decreases by 43.63%, 62.22%, and 68.92%, respectively. The results show that the model has high prediction accuracy and can effectively predict the torque of the HDV driveshaft. © The Institution of Engineering & technology 2024.

关键词： Prediction models

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OPTIMIZING MULTI-INPUT SCHEDULING FOR FUZZING TEST USING BAYESIAN ALGORITHM WEIGHT OPTIMIZATION 10

OPTIMIZING MULTI-INPUT SCHEDULING FOR FUZZING TEST USING BAY...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Fang, Junzhe Wang, Liyong Ji, Haojie Guo, Teng Hu, Te Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China Zaozhuang Network Security Guarantee Center Zaozhuang China

ISBN: (纸本)9781837242672

As a major software testing method, fuzzing has the potential to enhance testing coverage and detect a great number of software vulnerabilities in complex code programs. The current fuzzy testing for multiple input parameters lacks an effective calling mechanism and treats all variant parameter equally, resulting in low efficiency. This paper presents a fuzzy testing method based on Bayesian algorithm for scheduling parameters. Firstly, it combines the characteristics of input parameters to match the appropriate variation strategy. Secondly, it utlizes the Bayesian algorithm to automatically generate weight values for the objective function index during sufficient testing. It evaluates test cases with multi-parameter inputs according to these weights and selects parameters with high utilization value for multiple tests. Finally, in order to evaluate the effectiveness of the method of this paper, an application programming interface of Amercian fuzzy lop (AFL-API) is developed based on the typical fuzzy testing tool AFL++, and compared with AFL++ as a fuzzy testing tool. The experimental results demonstate that when using the AFL-API for program testing, there was 47% increase in coverage rate, 52% increase in the number of discovered crashes, and more program vulnerabilities were identified during actual testing. © The Institution of Engineering & technology 2024.

关键词： Software testing

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Research on positioning accuracy of the swivel head of milling and turning complex machining center 11

Research on positioning accuracy of the swivel head of milli...

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2024 11th International Conference on Advanced Manufacturing technology and Materials Engineering, AMTME 2024

作者： Si, Weizheng Tang, Jianhao Liu, Jianhua Wei, Zijun Mao, Luyao Guangdong Institute of Intelligent Manufacturing Guangdong Key Laboratory of Modern Control Technology China

This article focuses on the swivel head of a milling-turning complex machining center and establishes a geometric error model between the rotary axes based on the multi-body system theory and the homogeneous coordinate transformation method. The double ball bar (DBB) is used to identify the geometric errors of the machine tool swivel head position-independent by measuring circular trajectories. The impact of PIGEs on the measurement trajectory is simulated. The swivel head is rotated at four angles (B0°, B45°, B90°, B-15°), and the laser tracker is used to analyze and study the linear axis straightness, perpendicularity, and the center coordinates and plane errors of the swivel head movement along the XZ plane. A swivel head rotation accuracy test fixture is designed to correct the positioning accuracy of a swivel head with a 45° inclination of the rotation axis. The research results show that the fluctuation of the center plane degree of freedom of the swivel head moving along the XZ plane is small, and the maximum value is 0.0086mm. Under the 45° angle posture of the swivel head, both the center coordinate error value and the plane error value are the largest. The simulation results of the swivel head position error are fairly consistent with the center coordinate error of the swivel head plane movement. A backward tilt displacement of 0.01mm~0.015mm of the machine column during assembly can reduce the influence of the weight of the swivel head on the perpendicularity and straightness of the vertical reciprocating motion, and adding auxiliary support near the base of the swivel head zero position can reduce machine straightness error. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Degrees of freedom (mechanics)

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INVESTIGATION OF AUTONOMOUS GROUND CURRENT FIELD INJECTION SIGNAL CHARACTERISTICS 10

INVESTIGATION OF AUTONOMOUS GROUND CURRENT FIELD INJECTION S...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Wang, Yanke Su, Zhong Chu, Sirui Ling, Zhongao Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Autonomous injection of signals to generate ground current field technology is used to realize signal transmission by injecting signals into the ground to form a ground current field. In this paper, horizontal double electrodes are used to inject the signal into the ground, and the model of the ground equivalent electrical network is established according to the circuit characteristics, and the signal transmission characteristics are simulated and analyzed. In order to verify the penetration ability of different signals, square wave, sine wave and triangle wave are injected into the ground, and the signals are received at 13m and 18m and processed and analyzed. The results show that the square wave has the best penetration, followed by the sine wave and finally the triangle wave, which is consistent with the simulation results and verifies the accuracy of the model and the signal penetration ability in the medium. © The Institution of Engineering & technology 2024.

关键词： Equivalent circuits

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RSSI-BASED INJECTED GROUND CURRENT FIELD LOCALIZATION STUDY 10

RSSI-BASED INJECTED GROUND CURRENT FIELD LOCALIZATION STUDY

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Chu, Sirui Su, Zhong Wang, Yanke Ling, Zhongao Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Aiming at the problem that traditional positioning techniques are easily limited in complex environments, this study proposes a positioning method based on Received Signal Strength Indication (RSSI) of injected ground current field, which is suitable for closed or sheltered environments, such as underground alleyways, and also works effectively under extreme conditions, such as alleyways collapsing. Firstly, the validity of the ground current field signals is tested to ensure that the signals are reliable;secondly, the extracted signals are screened to remove signals with low signal-to-noise ratios and high ground resistance, and to reduce the influence of environmental noise on the localization results;next, the RF parameter A as well as the signal transmission constant n are computed using the linear regression least square method, which provide important fitting parameters for the subsequent establishment of the RSSI localization model;finally, a Gaussian filtering to process the RSSI data collected by modelling. The experimental results show that the method achieves the positioning of underground alleyways environment with good feasibility and effectiveness, and provides a feasible solution for carrying out efficient alleyway personnel positioning and rescue operations, which has important theoretical significance and practical value. © The Institution of Engineering & technology 2024.

关键词： Linear regression

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Vibro-Acoustic Analysis for Transformer under DC Bias Based on Electromagnetic Coupling

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Progress In Electromagnetics Research B 2024年 104卷 171-186页

作者： Pan, Chao Shi, Xiaobo Fu, Tongrui An, Jingge Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China

Aiming at the operational stability of DC-biased transformer, a multi-parameter correlation method based on electromagnetic coupling is presented in this paper. The mode-state analysis scheme is designed, and the feature parameters of electromagnetic, mechanical, and acoustic fields in internal components are simulated and analyzed. The electromagnetic properties under DC bias are simulated by the electromagnetic model, thus the winding current and magnetic flux density are extracted as the feature parameters. Then the vibration and stress distribution can be solved by the mechanical model, which are treated as the feature parameters of the mechanical field. By utilizing the computed mechanical information as excitation, the spatial-temporal distribution of sound pressure can be obtained in the acoustic model. Taking three-phase three-limb transformer and three-phase group transformer as examples, the electromagnetic, mechanical, and acoustic parameters of components are analyzed under different conditions. The variations of feature parameters are summarized and contrasted. Furthermore, actual vibration and noise parameters are measured through dynamic experimental platforms. The effectiveness of the multi-parameter correlation method is verified by the consistency between simulation and experiments, and the unobservable abnormal physical features can be represented by observable electrical information. © 2024, Electromagnetics Academy. All rights reserved.

关键词： Correlation methods

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A STUDY OF THE CHARACTERISTICS OF THE INFLUENCE OF THE PRECESSION FACTOR OF AN ALL-METAL MICRO-HEMISPHERICAL RESONATOR 10

A STUDY OF THE CHARACTERISTICS OF THE INFLUENCE OF THE PRECE...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Gu, Xibing Su, Zhong Yao, Xiangxian Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

The precession factor of resonant gyro is the key performance index of gyro sensitive angular velocity, and the main factors affecting the precession factor are the structural parameters of the resonator. In this paper, an all-metal micro-hemispherical resonator with a radius of 3mm is taken as the research object, the expression of the precession factor of the hemispherical resonator is established, and the intrinsic frequencies under different modal orders are obtained through the finite element simulation experimental method, and the influences of the radius of the hemispherical shell, the thickness of the shell, the diameter of the central axis rod, and the radius of the inner fillet angle on the precession factor of the resonator are analyzed. The experimental results show that the size of the inner fillet radius has a significant effect on the precession factor, and the precession factor of the metallic micro-hemispherical resonator is mainly maintained at 0.2980 with a variation range of less than 1%. This study provides reference data for the optimization of the structural parameters of the all-metal micro-hemispherical resonator. © The Institution of Engineering & technology 2024.

关键词： Gyroscopes

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A STUDY OF CAPICITANCE CHARACTERS OF METAL MICRO-HEMISPHERICAL RESONANT GYRO DETECTION 10

A STUDY OF CAPICITANCE CHARACTERS OF METAL MICRO-HEMISPHERIC...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Yao, Xiangxian Su, Zhong Gu, Xibing Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Compared with the traditional quartz hemispherical resonant gyro, the metal micro hemispherical resonant gyro has a stronger high overload capacity and can adapt to more extreme environments, and its capacitance characteristics directly determine the performance of the metal micro hemispherical resonant gyro. In this paper, an oscillator with a diameter of 12 mm is selected, and the capacitance characteristics of the metal micro hemispherical resonant gyro are studied in detail from the two influencing factors of the number of oscillator teeth and capacitance spacing. The finite element simulation of the oscillator has been carried out using finite element software and the capacitive characteristics have been simulated and analyzed. The results show that when the number of teeth of the oscillator is 16 teeth and the capacitance spacing is 0.05 mm, the excited area is enhanced by 460% and the capacitance value increases to 10 pF. This study provides an important theoretical basis for the capacitance design of the resonant gyro with a metal micro hemisphere. © The Institution of Engineering & technology 2024.

关键词： Gyroscopes

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