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24 results on '"Yang, Wenjia"'

9. A Distribution System State Estimation Analysis Considering the Dynamic Load Effect

Author

Chen Wang, Qian Liu, Linlin Ma, Guanhong Liu, Bing Zhang, Liu Xiaoliang, Xiaohui Wang, Yang Kun, Xianli Ma, and Yang Wenjia

Subjects
Control theory, Property (programming), Computer science, 020208 electrical & electronic engineering, 0202 electrical engineering, electronic engineering, information engineering, 02 engineering and technology, State (computer science), Electrical impedance, Dynamic load testing, Power (physics), Exponential function
Abstract

the reliable state awareness of modern distribution system relies on advanced measurement system, well-adapted calculation method as well as a better understanding of load and embedded power source. State estimator, as the most important tool to achieve real-time state awareness must take load model into consideration. In this paper, the ERL (Exponential Recovery Load) model is utilized to grasp the dynamic property during the disturbance periods. The proposed SE procedure is detailed in this paper and a simulation case with IEEE-33-bus system is conducted to verify the effectiveness.

Published
2018

14. Automatic establishment and optimal selection of power system black start plans

Author

Li Yuzhi, Lin Yong, Wu Jinyu, Yang Wenjia, Xiao Junming, Fu Lei, Jin Fei, and Zhu Hainan

Subjects
Engineering, Index (economics), Power system restoration, Operations research, business.industry, 020209 energy, Blackout, 02 engineering and technology, Plan (drawing), Electric power system, Path (graph theory), 0202 electrical engineering, electronic engineering, information engineering, medicine, Power grid, medicine.symptom, business, Selection (genetic algorithm), Simulation
Abstract

Black start plan is very important for power system restoration after a blackout. In this paper, a new method is proposed to establish the initial black start plans automatically and evaluate the established plans. With consideration of the special power system status, black-start (BS) unit and non-black-start (NBS) units are preselected to reduce the calculation burden. The k-shortest path algorithm is applied to form the initial black start plans. Then, a new evaluation index is defined to assess the plans. The plan with the maximum index is selected as the optimal plan. Simulation results of Shandong power grid show that the proposed method is effective and feasible.

Published
2016

16. A Multiscale Topology Optimization Methodology Based on Sequential Element Rejection–Admission and Boundary Element Evolvement.

Author

Yang, Wenjia, Ho, S. L., and Fu, W. N.

Subjects
*TOPOLOGY
Abstract

To enhance both the solution speed and quality of a topology optimization (TO), a multiscale TO methodology by combining the sequential element rejection–admission (SERA) and boundary element evolvement is presented. In the proposed SERA approach, only the sensitivities of the boundary elements need to be computed and used, and an adaptive parameter updating strategy is introduced to balance the requirements on both convergence and quality performances. To eliminate the dependence of the final solution on the initial topology, a new hole generating mechanism is proposed. In addition, a sensitivity filter is designed to remove the checkerboard patterns as well as to further eliminate the mesh-dependent problem. Numerical results are reported to showcase the merits of the proposed methodology. [ABSTRACT FROM AUTHOR]

Published
2019
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18. Human Segmentation in Infrared Videos Using Markov Random Field

Author

Li Yapeng, Yang Wenjia, Chai Zhi, and Xiaodan Xie

Subjects
Markov random field, Computer science, business.industry, Segmentation-based object categorization, Posterior probability, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Scale-space segmentation, Pattern recognition, Image segmentation, ComputingMethodologies_PATTERNRECOGNITION, Feature (computer vision), Computer vision, Segmentation, Artificial intelligence, business, Cluster analysis
Abstract

This paper presents a Bayesian approach for human segmentation in infrared video sequences. To overcome the limitations of background modeling in dealing with pixel-wise processing, our background model is combined with clustering cue in a maximum a posterior probability (MAP)-MRF framework. This can not only enable us to exploit the spatial and temporal coherence to maintain the continuity of our segmentation, but also takes the interdependence of feature and segmentation field into consideration. Experimental results for several infrared video sequences are provided to demonstrate the effectiveness of the proposed approach.

Published
2013

19. An Efficient Direct Search Methodology for Robust Optimization of Electromagnetic Devices.

Author

Yang, Wenjia, Ho, S. L., and Yang, Shiyou

Subjects
*ROBUST optimization, *ELECTROMAGNETIC devices, *ENERGY consumption, *PROBLEM solving, *EVOLUTIONARY algorithms
Abstract

A direct search formulation to treat the robust performances as additional constrained functions is proposed for robust optimization of electromagnetic devices under uncertainties. To solve the resulting robust optimization problem, a robust-oriented quantum-inspired evolutionary algorithm (QEA) is proposed. In the proposed robust-oriented QEA, a mechanism to activate the robust performance checking procedure only to promising solution is introduced, and an automatic updating mechanism for the increment angle is designed to guarantee a good balance between exploration and exploitation searches. Also, the stochastic approximation method is employed to minimize the computational burdens in determining the gradient information. The numerical results on two case studies are reported in order to validate the feasibility and the merit of the proposed direct search methodology in solving both benchmark problems and practical engineering robust optimal designs. [ABSTRACT FROM AUTHOR]

Published
2018
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20. Research on a new networked manufacturing mode

Author

Shen Chunyan, Yang Wenjia, Jinan Gu, and Chen Xuefang

Subjects
Collaborative software, Engineering, Service (systems architecture), business.industry, media_common.quotation_subject, Frame (networking), Application service provider, Topology (electrical circuits), Mode (computer interface), Software, Systems engineering, business, Function (engineering), media_common
Abstract

This paper analyzed the status of networked manufacturing technologies, put forward new networked manufacturing mode based on the integration of ASP and CPC; constructed the overall framework for designing system under new networked manufacturing mode; integrated service and function from CPC based previous ASP networked manufacturing mode with deeply analysis about these service and topology structure, in order to satisfy personal service; adopted the MVC frame to implement prototype system, and tested for instance.

Published
2010

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