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- 저자 : Xingshuo Li (검색결과 5 건)
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Photovoltaic Modified β-Parameter-based MPPT Method with Fast Tracking
Li, Xingshuo,Wen, Huiqing,Jiang, Lin,Lim, Eng Gee,Du, Yang,Zhao, Chenhao The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.1
Maximum power point tracking (MPPT) is necessary for photovoltaic (PV) power system application to extract the maximum possible power under changing irradiation and temperature conditions. The β-parameter-based method has many advantages over conventional MPPT methods; such advantages include fast tracking speed in the transient stage, small oscillations in the steady state, and moderate implementation complexity. However, a problem in the implementation of the conventional beta method is the choice of an appropriate scaling factor N, which greatly affects both the steady-state and transient performance. Therefore, this paper proposes a modified β-parameter-based method, and the determination of the N is discussed in detail. The study shows that the choice of the scaling factor N is determined by the changes of the value of β during changes in irradiation or temperature. The proposed method can respond accurately and quickly during changes in irradiation or temperature. To verify the proposed method, a photovoltaic power system with MPPT function was built in Matlab/Simulink, and an experimental prototype was constructed with a solar array emulator and dSPACE. Simulation and experimental results are illustrated to show the advantages of the improved β-parameter-based method with the optimized scaling factor.
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Evaluation of MPPT and APC Performance Connected with Different DC Load Types
Xingshuo Li,Huiqing Wen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
So far, a large number of MPPT techniques have been reported, compared and evaluated. However, the performance of MPPT methods with different DC loads is not evaluated yet. Besides, the difference between DC loads for the active power control (APC) schemes is also not compared and evaluated yet. Therefore, in this paper, two different DC load types, namely resistive load and battery load, are used to make a comparison. In order to validate the difference between the different load types, simulation and experimental results when the solar irradiance changes are provided. It will be very useful to the design the MPPT and APC method in practical.
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Improved Beta parameter based MPPT method in Photovoltaic system
Xingshuo Li,Huiqing Wen,Chenhao Zhao 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Maximum power point tracking(MPPT) is very important in relation to solar energy development. Currently, there are two problems facing the existing MPPT methods namely the tradeoff between the steady-state oscillations and dynamic behavior, and then the tradeoff between high computational load and accuracy. The Beta method can address these two problems since it shows a fast tracking speed in the transient stage, smaller oscillations in the steady-state and medium complexity of implementation. However, for optimal performance, it is essential to identify the configuration of the parameters with regard to the Beta method. Therefore, paper will examine the different performance level with the different values of the parameters, and then will provide an optimum example. In order to verify this procedure, a boost converter was proposed in MatLab/Simulink for simulation. Finally, an experimental prototype was constructed with a solar array emulator and DSPACE.
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Photovoltaic Modified β-Parameter-based MPPT Method with Fast Tracking
Xingshuo Li,Huiqing Wen,Lin Jiang,Eng Gee Lim,Yang Du,Chenhao Zhao 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.1
Maximum power point tracking (MPPT) is necessary for photovoltaic (PV) power system application to extract the maximum possible power under changing irradiation and temperature conditions. The β-parameter-based method has many advantages over conventional MPPT methods; such advantages include fast tracking speed in the transient stage, small oscillations in the steady state, and moderate implementation complexity. However, a problem in the implementation of the conventional beta method is the choice of an appropriate scaling factor N, which greatly affects both the steady-state and transient performance. Therefore, this paper proposes a modified β-parameter-based method, and the determination of the N is discussed in detail. The study shows that the choice of the scaling factor N is determined by the changes of the value of β during changes in irradiation or temperature. The proposed method can respond accurately and quickly during changes in irradiation or temperature. To verify the proposed method, a photovoltaic power system with MPPT function was built in Matlab/Simulink, and an experimental prototype was constructed with a solar array emulator and dSPACE. Simulation and experimental results are illustrated to show the advantages of the improved β-parameter-based method with the optimized scaling factor.
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Yinxiao Zhu,Huiqing Wen,Guanying Chu,Xingshuo Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
With consideration of instability in environmental conditions, the increasing installation of maximum power point (MPP) operational Photovoltaic systems (PVSs) injects an unstable power generation to the grid (such as, overloading). Aiming to reduce the instable generation during continuous peak power generation, an adaptive constant power generation (CPG) algorithm is proposed in this paper. With the proposed control, the system can operate at MPP tracking (MPPT) mode or CPG mode with the detection from system operators. When the operation mode is detected, the control will operate with self-judgment including regulate the initial mode during CPG with a simple MPP initial MPP estimation. With the estimation of MPP and internal step-size regulation, the response speed, an important factor in variable environments, can be improved. In order to evaluate the proposed scheme, simulation and experiment in different condition, such as changing irradiation and changing limit power level are carried out.
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