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Based on the instantaneous power theory, photovoltaic grid connected inverter power predictive model in d-q rotating coordinates was established. After sampling grid current, output active power and reactive power of the grid-connected can be directly predicted by using the predictive model. The model predictive direct power control strategy of photovoltaic grid connected inverter was designed. According...
According to the mathematical model of three-phase grid-connected inverters, a model-predictive current control method is proposed in the two-phase static αβ-frame. Based on principle of model predictive control, a predictive model of grid-connected currents in the αβ-frame is established by using only once coordinate transformation to assess different voltage vectors of inverters and predict all...
Serious nuclear accident releases radioactive 131I and causes a drop ash pollution. In order to detect radioactive substances and measure its features as concentration, energy etc. quickly, we design a kind of beta rays detector, which is based on inorganic scintillation Zn S (Ag) light-emitting principle. Use Beijing CR124 photomultiplier tubes for change device. Detect the standard samples. This...
In this paper, when the stator fault, the stator input voltage of motor are deduced, based on the mathematical model of induction motor in the αβ reference frame. Establish and simulate the stator fault three-phase induction motor model to get the stator fault currents. Using filters to remove the 50 Hz fundamental component of stator fault currents, then do the spectral analysis of these currents...
Based on mathematical analysis, the dynamic mathematical model of asynchronous motor with iron loss and the model without iron loss are deduced. Using the basic modules and S-function of MATLAB/SIMULINK, the simulation models of three phase asynchronous motor with iron loss and without iron loss are built. Compare the two models with the results of simulations, and give the influence on stator current,...
The pallet recognition method based on feature-to-feature laser scan matching is proposed. The laser scan data are clustered into one line segment if they belong to one object or adjacent objects; then the corner points are found in the line segments; therefore, the environment can be expressed by the line segments. The environment line segments are compared with the pallet model to recognize the...
An electronic voltage transformer based on WLAN technology is developed for adapting to the development trends of substations' synthesis automation. The transformer is composed of voltage-to-current conversion unit, signal processing unit and data transmitting unit. The voltage-to-current conversion unit converts high voltage signal to weak current signal. The signal processing unit amplifies weak...
It is difficult to analyze Multi-conductor Transmission lines (MTL) terminated in the frequency dependent loads. The impedance/admittance of the frequency dependent loads can be measured by using Impedance Analyzer. The frequency domain impedances/admittances are fitted by Vector Fitting Method and a rational function is obtained. The rational function can be converted into a circuit, then pspice/Spice...
Generally considering, although the ability of the conventional electronic computer is unassailable in performing sequential task, DNA computing, compared with the conventional electronic computer, has shown natural advantages in solving the problems, which exist everywhere and can be solved by an exhaustive search through all possible solutions. To take advantage of both virtues, a new organizational...
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