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Finite Frequency Fault Detection for T-S Fuzzy Singular Multiple Timedelay Systems
Ding Zhai,Li-Wei An,Jing-Hao Li,Qing-Ling Zhang 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.4
This paper focuses on the problem of fault detection (FD) for a class of nonlinear systems describedby the T-S fuzzy singular model with multiple time delays and actuator faults. Two finite-frequency performanceindices are introduced to measure fault sensitivity and disturbance robustness. To reduce the conservatism of theexisting results, a finite frequency domain approach to fuzzy singular multiple time-delay systems is proposed. Then based on the approach, filter design conditions for the solvability of this problem are presented in terms oflinear matrix inequalities (LMIs). Finally, simulation studies are provided to demonstrate the application of theproposed method.
Ding, Kun,Wang, Xiang,Zhai, Quan-Xin,Xu, Jun-Wei,Zhang, Jing-Wei,Liu, Hai-Hao The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.4
The power-voltage (P-V) curve of photovoltaic (PV) arrays connected in parallel to bypass diodes would have several local maximum power points (LMPP) under partial shading conditions (PSC). Conventional maximum power point tracking (MPPT) methods fail to search for the global maximum power point (MPP) because the searched peak point may remain at the LMPP on the P-V curve under PSC. This study proposes an improved MPPT algorithm to ensure that PV arrays operate at global maximum power point (GMPP) under PSC. The proposed algorithm is based on a critical study and a series of observations of PV characteristics under PSC. Results show the regularity of voltage interval between LMPPs. The algorithm has the advantages of rapidly reaching GMPP, maintaining stability, and recovering GMPP quickly when the operating condition changes. Simulation and experimental results demonstrate the feasibility of the proposed algorithm.
The Influence of Changing PV Array Interconnections under a Non-uniform Irradiance
Ding, Kun,Feng, Li,Qin, Si-Yu,Mao, Jing,Zhang, Jing-Wei,Wang, Xiang,Peng, Tao,Zhai, Quan-Xin The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
Usually, the output characteristics of a photovoltaic (PV) array are significantly affected by non-uniform irradiance which is caused by ambient obstacles, clouds, orientations, tilts, etc. Some local maximum power points (LMPP) in the current-voltage (I-V) curves of a PV array can result in power losses of the array. However, the output power at the global maximum power point (GMPP) is different in different interconnection schemes in a PV array. Therefore, based on the theoretical analysis and mathematical derivation of different topological structures of a PV array, this paper investigated the output characteristics of dual series PV arrays with different interconnections. The proposed mathematical models were also validated by experimental results. Finally, this paper also concluded that in terms of performance, the total cross tied (TCT) interconnection was not always the optimal structure, especially in a dual series PV array. When one of the PV modules was severely mismatched, the TCT worked worse than the series parallel (SP) structure. This research can provide guidance for switching the interconnection to gain the greatest energy yield in a changeable- structure PV system.
The Influence of Changing PV Array Interconnections under a Non-uniform Irradiance
Kun Ding,Li Feng,Si-Yu Qin,Jing Mao,Jing-Wei Zhang,Xiang Wang,Tao Peng,Quan-Xin Zhai 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
Usually, the output characteristics of a photovoltaic (PV) array are significantly affected by non-uniform irradiance which is caused by ambient obstacles, clouds, orientations, tilts, etc. Some local maximum power points (LMPP) in the current-voltage (I-V) curves of a PV array can result in power losses of the array. However, the output power at the global maximum power point (GMPP) is different in different interconnection schemes in a PV array. Therefore, based on the theoretical analysis and mathematical derivation of different topological structures of a PV array, this paper investigated the output characteristics of dual series PV arrays with different interconnections. The proposed mathematical models were also validated by experimental results. Finally, this paper also concluded that in terms of performance, the total cross tied (TCT) interconnection was not always the optimal structure, especially in a dual series PV array. When one of the PV modules was severely mismatched, the TCT worked worse than the series parallel (SP) structure. This research can provide guidance for switching the interconnection to gain the greatest energy yield in a changeable- structure PV system.
Kun Ding,Xiang Wang,Quan-Xin Zhai,Jun-Wei Xu,Jing-Wei Zhang,Hai-Hao Liu 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.4
The power?voltage (P?V) curve of photovoltaic (PV) arrays connected in parallel to bypass diodes would have several local maximum power points (LMPP) under partial shading conditions (PSC). Conventional maximum power point tracking (MPPT) methods fail to search for the global maximum power point (MPP) because the searched peak point may remain at the LMPP on the P?V curve under PSC. This study proposes an improved MPPT algorithm to ensure that PV arrays operate at global maximum power point (GMPP) under PSC. The proposed algorithm is based on a critical study and a series of observations of PV characteristics under PSC. Results show the regularity of voltage interval between LMPPs. The algorithm has the advantages of rapidly reaching GMPP, maintaining stability, and recovering GMPP quickly when the operating condition changes. Simulation and experimental results demonstrate the feasibility of the proposed algorithm.
Bottom-Gate Amorphous In2O3 Thin Film Transistors Fabricated by Magnetron Sputtering
Yang Jiao,Xinan Zhang,Junxia Zhai,Xiankun Yu,Linghong Ding,Weifeng Zhang 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.3
In this letter, bottom-gate thin film transistors using amorphous In2O3 as the n-channel active layer were fabricated on SiO2/Si substrates by direct current magnetron sputtering at room temperature. By controlling the sputtering time, In2O3 can be grown into the amorphous phase. Compare to its crystalline counterpart,amorphous In2O3 offer distinctive attractions such as smoother surfaces, better film uniformity, while maintaining comparable or greater carrier mobility. The device with amorphous channel layer shows good performance with the mobility of 15 cm2/Vs and the current on-off ratio of 106. The device operates in enhancement mode with the threshold voltage of 1.4 V. Excellent device performance and low fabrication temperature make the In2O3-TFTs suitable for the potential applications in the large-area electronics.