This paper presents the fuzzy modeling approach to the description QV curve of power system for analysis of voltage stability. Voltage instability of power system comes from increasing load rapidly, and causes bus vol...
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ISBN:
(纸本)9789604741748
This paper presents the fuzzy modeling approach to the description QV curve of power system for analysis of voltage stability. Voltage instability of power system comes from increasing load rapidly, and causes bus voltage to drop. When voltage is out of control and it can be voltage collapse. The QV curve can identify voltage stability limit, and it determine robustness of power system. The method of fuzzy modeling has been proven to be well-suited for modeling nonlinear industrial processes described by input-output data. In view of the nonlinear characteristic of the QV curve, the method of fuzzy modeling is employed for representing the curve. The fuzzy system model is basically a collection of fuzzy IF-THEN rules that are combined via fuzzy reasoning for describing the features of a system under study. Based on the Sugeno-type fuzzy model, various models with different numbers of modeling rules are used to describing the QV curve. It is found that such fuzzy model offers both quantitative and qualitative descriptions for the QV curve.
This paper presents the design of modal insensitivity for the synchronous generator in a power system using Eigenstructure Assignment. In the proposed design procedure, modal insensitivity of generator is achieved by ...
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ISBN:
(纸本)9789604742332
This paper presents the design of modal insensitivity for the synchronous generator in a power system using Eigenstructure Assignment. In the proposed design procedure, modal insensitivity of generator is achieved by assigning system eigenstructure and only algebraic computations are involved. Model insensitivity means that the concerned system mode shape is insensitive to small variations in the system. From the simulation results of the study in a single-machine-infinite-bus system are certified. It is found that the system damping has been greatly improved. The proposed design has improved on the sensitivity.
This paper used six formulas for power factor measurement, and they will be different according to the characteristics of load. The power quality is more and more serious, because a lot of informationtechnology equip...
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ISBN:
(纸本)9789604741748
This paper used six formulas for power factor measurement, and they will be different according to the characteristics of load. The power quality is more and more serious, because a lot of informationtechnology equipments and power electric converters were used in recent years. Harmonic and load unbalance can affect the measurement result of power factor of utility. The Fast Fourier Transform (FFT) is used to analyze the six formula of power factor. The simulation system was modeled in Hardware Description Language (VHDL) and some novel IP (intellectual property) cores, such as CORDIC core and FFT core by the way of Bottom-Up. The technology of semiconductor was more and more maturely. Design of SOC (System On a Chip) is a trend to achieve the strong and small volume in the future. The measurement data were employed to calculate active, reactive and apparent power. The average error rate of our design is about 0.05%.
Acquisition of pervasive sensor data can be often unsuccessful due to power outage at nodes, time synchronization issues, interference, network transmission failures or sensor hardware issues. Such failures can lead t...
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Helicopter is a nimble vehicle with flight property. It can take off or land vertically, move in any direction and hover. Because of the innate instability and highly nonlinear property, designing autonomous flight co...
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ISBN:
(纸本)9781849192088
Helicopter is a nimble vehicle with flight property. It can take off or land vertically, move in any direction and hover. Because of the innate instability and highly nonlinear property, designing autonomous flight control system of helicopter is of much difficulty. The main consideration in helicopter flying control is to hover and to land. In this paper, we consider the case that a CCD is hanged on helicopter as an auxiliary sensor. The CCD can get the image of H-type hard-stand on the ground and calculate the horizontal shift error and height of helicopter by PC. It can apply to observe the river, disaster area, science and military detection. In order to get the information about aerial photography and observation, we add the function of taking picture and video recording.
In this paper, we develop a rescue robot that searches for the victim in the disaster scene. To go into a narrow space in such a scene, size of the robot should be small. But the ability to pass over the trench and th...
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ISBN:
(纸本)9780889868595
In this paper, we develop a rescue robot that searches for the victim in the disaster scene. To go into a narrow space in such a scene, size of the robot should be small. But the ability to pass over the trench and the rubble is important. We propose the crawler type robot which has the expandable side crawler. This mechanism can enlarge the mobility of the robot by expanding the side crawler when it is necessary. And this rescue robot pass the rubble by using the side crawler as the arm. So that the swing mechanism for the side crawler is also installed. Details of the developed robot and several experiments are denoted in this paper.
This paper presents a new method that solves a mixed constraints problem by transforming it into a mixed integer programming problem. The method builds the connection between the feasibility of a mixed constraint prob...
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In vibration-based structural health monitoring damage in structure is tried to detect from damage-sensitive features. Because neither prior information nor data about expected damage are normally available, damage de...
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In vibration-based structural health monitoring damage in structure is tried to detect from damage-sensitive features. Because neither prior information nor data about expected damage are normally available, damage detection problem must be solved by using a novelty detection approach. Features, which are sensitive to damage, are often sensitive to environmental and operational variations. Therefore elimination of these variations is essential for reliable damage detection. At present many of the damage detection methods are linear, though it has been shown that many of the vibration changes in structures are bilinear or nonlinear. This paper proposes to use nonlinear factor analysis to detect damage via elimination of external effects from damage features. The effectiveness of the proposed method is demonstrated by analyzing the experimental Z24 Bridge data with a comparison to a linear method. It is shown that elimination of adverse effects and damage detection are feasible.
This study intended to develop a new method for the analysis and assessment of city surface temperatures (ST). Landsat data from 1994 to 2003 were used, and Daegu, Korea, was selected as the study region. Surface temp...
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Each node equipped with multiple interfaces in multi-channel wireless mesh networks can increase the network throughput when applied to appropriate channel assignment and routing protocols. In this paper,we analyze th...
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Each node equipped with multiple interfaces in multi-channel wireless mesh networks can increase the network throughput when applied to appropriate channel assignment and routing protocols. In this paper,we analyze the channel assignment and channel switching problems in WMN where the number of interfaces is smaller than the number of channels. Ripple effect caused by channel switching is presented. The method to restrict the distance of ripple effect and to balance the load among channels is given. We also advance the Weighted Expected Residual Transmission Rate (WERTR)-a load-aware routing metric-to select a best quality route which is suitable for use with our proposed channel assignment strategy.
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