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An Improved Predictive Current Control Scheme for Three-phase Voltage Source Converters

JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS 2016年第11期25卷 1650133-1650133页

作者： Wang, Meng Shi, Yanyan Henan Normal Univ Coll Phys & Elect Engn Xinxiang 453007 Peoples R China

For a fully digital control of PWM converters, considerable research has been done based on the predictive current control (PCC) scheme. However, it requires a large amount of calculation in the step of experimental implementation. Besides, when compared with the classical linear control scheme, the sampling interval of the PCC scheme must be shorter to obtain the same control performance for current. Due to this, a digital signal processor with excellent performance is required. This paper proposes an improved simplified model PCC scheme for three-phase PWM converters. The main objective is to simplify the PCC scheme. Also, the proposed control scheme is able to reduce the calculation time without affecting the performance. Simulations and experiments are carried out to investigate the presented novel predictive current control scheme. The results indicate that the three-phase PWM converter has excellent static and dynamic performance with the proposed scheme. Besides, the calculation time can be obviously shortened.

关键词： PWM converters predictive current control calculation time simplified algorithm

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A simplified Finite-Control-Set Model-Predictive Control for Power Converters

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IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS 2014年第2期10卷 991-1002页

作者： Xia, Changliang Liu, Tao Shi, Tingna Song, Zhanfeng Tianjin Univ Sch Elect Engn & Automat Tianjin 300072 Peoples R China Tianjin Polytech Univ Tianjin Key Lab Adv Technol Elect Engn & Energy Tianjin 300387 Peoples R China

Finite-control-set model-predictive control (FCS-MPC) requires a large amount of calculation, which is an obstacle for its application. However, compared with the classical linear control algorithm, FCS-MPC requires a shorter control loop cycle time to reach the same control performance. To resolve this contradiction, this paper presents an effective method to simplify the conventional FCS-MPC. With equivalent transformation and specialized sector distribution method, the computation load of FCS-MPC is greatly reduced while the control performance is not affected. The proposed method can be used in various circuit topologies and cases with multiple constraints. Experiments on two-level converter and three-level NPC converter verify the good performance and application value of the proposed method.

关键词： Finite-control-set model-predictive control (FCS-MPC) power converter sector distribution method simplified algorithm

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simplified Soft Demapping algorithm for Gray-APSK

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IEICE TRANSACTIONS ON COMMUNICATIONS 2013年第7期E96B卷 1814-1818页

作者： Huang, Jiachen Pan, Changyong Peng, Kewu Fan, Liwen Song, Jian Tsinghua Univ Tsinghua Natl Lab Informat Sci & Technol TNList Dept Elect Engn Beijing 100084 Peoples R China

Amplitude phase shift keying (APSK) constellation with Gray mapping was proposed recently. Inspired by the simplified soft demapping for regular Gray-QAM, a simplified soft demapping algorithm for Gray-APSK is proposed in this paper. Compared with conventional soft demapping schemes, its complexity is greatly reduced with only a little SNR loss, which is validated by the complexity analysis and FPGA compilation results.

关键词： Gray-APSK soft demapping simplified algorithm

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Transform Domain Shadow Removal for Foreground Silhouette

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2013年第3期E96A卷 667-674页

作者： Shiota, Toshiaki Nakagami, Kazuki Nishitani, Takao Tokyo Metropolitan Univ Grad Sch Syst Design Hino Tokyo 1910065 Japan

A novel shadow removal approach is proposed by using block-wise transform domain shadow detection. The approach is based on the fact that the spatial frequency distributions on normal background areas and those under casted shadows from foreground objects are the same. The proposed approach is especially useful for silhouette extraction by using the Gaussian Mixture background Model (GMM) foreground segmentation in the transform domain, because the frequency distribution has already been calculated in the foreground segmentation. The stable shadow removal is realized, due to the transform domain implementation.

关键词： shadow removal foreground segmentation transform domain simplified algorithm

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A simplified algorithm to the Atmospheric Transmittance

A Simplified Algorithm to the Atmospheric Transmittance

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International Symposium on Photonics and Optoelectronics

作者： Chen Shan Sun Ji-yin Res Inst High Tech Hongqing Town Xian 710025 Shanxi Peoples R China

ISBN: (纸本)9781424444113

It is very complex that the infrared radiation's actual transmission process through earth's atmosphere. There is interaction between radiation and atmospheric component. The radiation transmittance will be weakened because of the absorption and the scattering. The atmospheric transmittance is an important parameter to measure the attenuation. This paper summarizes the infrared radiation's transmission process in atmosphere, studies the computation method of atmospheric transmittance, analyzes the absorption attenuation of the atmospheric gas such as steam and carbon dioxide, the scattering attenuation and the attenuation caused by meteorological condition, infers the computation method of the atmospheric equivalent path, and gives the atmospheric transmittance simplified algorithm. Finally this paper gives the atmospheric transmittance computation result under given meteorological condition, also gives the contrast curve with LOWTRAN7.0. The algorithm has certain reference value in the project application.

关键词： atmospheric transmittance simplified algorithm atmospheric equivalent path

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The simplified Method to Calculate Two-dimensional Heat Conduction Equations of Heating Slab

The Simplified Method to Calculate Two-dimensional Heat Cond...

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The 2011 International Conference on Chemical, Mechanical and Materials Engineering(CMME2011)

作者： LI Guo-jun LI Xiao-Ting CHEN Hai-Geng School of Materials & Metallurgy Northeastern University

ISBN: (纸本)9783037852088

The most effective way of determining the whole billet temperature field is to use a simulation model. Large amount of calculation as well as computational time is consumed to employ two-dimensional finite difference method since the heating process is extremely complex, then it's necessary to simplify the calculation process. In this paper, a simplified method in one-dimension format was presented to calculate two-dimensional heat conduction equations of heating slab. The billet simulated was placed in a changeable thermal flux boundary environment, in which the thermal flux was proportional to fourth power of temperature. During the heating process, the changeable parameters were taken into account: i. e different billet dimensions, different billet thermal conduction, different specific heat, etc. The comparision between results of two-dimensional finite difference method and the simplified method verified that the simplified method can satisfy accuracy requirement as well as calculation time saving, which enable the simplified method online using.

关键词： heat conduction finite difference equations slab temperature field simplified algorithm

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LOW COMPLEXITY SHADOW REMOVAL ON FOREGROUND SEGMENTATION

LOW COMPLEXITY SHADOW REMOVAL ON FOREGROUND SEGMENTATION

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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Nakagami, Kazuki Shiota, Toshiaki Nishitani, Takao Tokyo Metropolitan Univ Tokyo Japan

ISBN: (纸本)9781457705397

A simplified shadow removal approach by using interim results of transformed domain GMM foreground segmentation has been developed. The approach is based on the fact that the spatial frequency distribution does not change from the backgrounds in the shadow areas. Due to employing gray level picture processing and to utilizing only low frequency components in the transform domain, the resultant shadow removal approach drastically reduces the amount of processing, compared to conventional shadow removal approaches based on pixel based color component processing.

关键词： Shadow Removal Foreground Segmentation Transformed Domain simplified algorithm

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Real-time simplified variable domain fuzzy control of PEM fuel cell flow systems

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EUROPEAN JOURNAL OF CONTROL 2008年第3期14卷 223-233页

作者： Tong, S. W. Liu, G. P. Chinese Acad Sci Key Lab Complex Syst & Intelligence Sci Beijing 100190 Peoples R China Univ Glamorgan Fac Adv Technol Pontypridd CF37 1DL M Glam Wales

The problem of building an accurate model and the request of real-time control are often simultaneously encountered in the design of control systems. This paper studies and implements a real-time simplified variable domain fuzzy control method in PEM fuel cell flow systems. The method can achieve not only the fine control over cathode pressure of fuel cell stacks by adjusting the input and output domains, but also the real-time control by activating at most four control rules at a time in the inference process for dual-input controller. The experimental results with no load and under a given load demonstrate good performance of this method. The method might also be utilized in other similar processes.

关键词： fuel cell fuzzy control real-time control simplified algorithm variable domain variable universe of discourse

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Quantification and Allocation of Peaking Costs of Hydro-Thermal Power Systems

Quantification and Allocation of Peaking Costs of Hydro-Ther...

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General Meeting of the IEEE-Power-and-Energy-Society

作者： Xie, J. Bai, X. Gan, D. Zhang, G. Zhejiang Univ Coll Elect Engn Hangzhou Zhejiang Peoples R China Northwest China Grid Co Ltd Xian Peoples R China

ISBN: (纸本)9781424419050

This paper addresses the quantification and allocation of peaking costs of hydrothermal power systems under electricity market environment. Mixed-integer linear formations of market scheduling of hydrothermal power systems is described, with the maximum ramping up/down limits and minimum start/off time limits of thermal generators, as well as the generation quantity and hydraulic vibrations of hydropower generators considered. The peaking costs are quantified based on the market scheduling model, with the impacts of transmission flow limit and generating constraints of hydro units and thermal units on peaking costs considered. Cooperative game theory is applied to allocate peaking costs among loads, the superadditivity and convex game characteristics of the peaking costs allocation problem are analyzed;a simplified algorithm for calculating Shapley value is proposed to overcome the combinatorial explosion problems of non-simplified Shapley value or nucleolus. Simulation results show that, operation constraints have severe impacts on the peaking capability of generation units as well as the economical operation of hydro-thermal power systems, and the simplified algorithm for calculating Shapley value is very effective in terms of calculation burden and precision.

关键词： hydro-thermal power systems peaking costs operation constraints of generators cost allocation cooperative game theory Shapley value simplified algorithm

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Study on the simplified algorithm of space vector PWM

Study on the simplified algorithm of space vector PWM

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5th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2003)

作者： Liu, H Xiao, XN Xu, YH N China Elect Power Univ Dept Elect Engn Beijing Peoples R China

ISBN: (纸本)0780378857

This paper, in accordance with the deficiency that the space vector PWM is complicated in calculation and difficult in engineering application, conducts detailed analyses of the classical solution algorithm for it, and proposes a simplified algorithm based on this. This algorithm simplifies the solution of the space vector PWM to the least degree;it can judge which sector the reference space vector V, is located in very conveniently, and, based on this, find the solutions of the space vector PWM algorithm very easily.

关键词： space vector simplified algorithm voltage source inverter PWM

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