The paper introduces the function, character and application of the automating identification system with intelligence that we have researched. The character of the system is as follows: 1. The system has A/D interfac...
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The paper introduces the function, character and application of the automating identification system with intelligence that we have researched. The character of the system is as follows: 1. The system has A/D interface, so it can make identification experiment if it is connected with measured equipment. 2. The system has global function. It possess all prevailing indentification algorithm both in time domain and frequency domain, and it can make spectrum analysis to the measured system. The algorithm of test orders, test model and data filtering is included. 3. The system has intelligence, it can choose signal and signal parameters to make experiment automatically. 4. The system can make cross test of the modelling results between the time domain and frequency domain. Finally the application result of the set in the motor drive system is presented to show the effectiveness.
A complex space phasor is continuously formed by any three given time-dependent real quantities, whose sum at any point in time is zero. Therefore, a space phasor represents unambiguously the heteropolar dynamic state...
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A complex space phasor is continuously formed by any three given time-dependent real quantities, whose sum at any point in time is zero. Therefore, a space phasor represents unambiguously the heteropolar dynamic state of a three-phase quantity, e.g. for power systems monitoring and control. After an introduction, various measuring devices utilizing space phasors are described. In monitoring the three-phase voltage state in a network node or amperage state in a network branch, the undesired asymmetries and harmonics may be suppressed by special modal algorithms. Their fast versions of direct type need not more than 4 samples within 8 milliseconds, their more precise versions of Fourier- or Kalman-type require at least one period of 50 or 60 Hz. In a similar way the instantaneous heteropolar active and reactive power in a branch can be determined. In case of jeopardized stability the three-phase instantaneous frequency of a power system is of interest, whereby electromagnetic disturbances must be eliminated. For this purpose a three-phase dynamic frequency-meter has been developed, including an observer based filter for the separation of the slow aperiodic frequency components from the faster swinging components. The direction of harmonic currents caused by power converters or other harmonic generators can be best detected by filtering the space phasor. An elastic firing control of power converters based on measured space phasor voltages is proposed for improving the stability of three-phase power systems energized by high voltage direct current transmission.
This paper deals with the formulation and its computational algorithm for overload release operation by generation rescheduling, line switching and also load shedding. The power dispatch problem is formulated as a mul...
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This paper deals with the formulation and its computational algorithm for overload release operation by generation rescheduling, line switching and also load shedding. The power dispatch problem is formulated as a multi-stage decision process with multi-criteria. First, performance index is set to minimize the maximum line overload to be relieved immediately after the overload occurrence. Next, after the initial optimization completed, operations are taken to suppress multiple overloads within a given upper bound. Subsequent operations are taken in the quickest way to restore shedded load. A multi-stage formulation has such an advantage that a dynamic generation scheduling problem which is cast into a linear programming framework to take advantage of sparse linear programming techniques. The advantages of an LP approach are complete computational reliability and very high speed, making it suitable for practical operation and also study-mode purpose. Numerical example in a test system are included to demonstrate the effectiveness of the approach which are shown to have reliability for power system operation.
A mathmatical model of the dose effect relationship of levodopa, one of the most common drugs in the symptomatic therapy of parkinson's disease, is derived with the aid of a visual tracking based method which allo...
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A mathmatical model of the dose effect relationship of levodopa, one of the most common drugs in the symptomatic therapy of parkinson's disease, is derived with the aid of a visual tracking based method which allows the measurment of some parkinsonian symptoms quantitatively and objectively, This third order non-linear model is used to optimize the dosage regimen for each patient individually with respect to an objective function which includes the symptoms dynamically and the total amount of levodopa which is to be administered. Encouraging clinical this approach are discussed and further research direction are indicated.
The main problems in modelling the thermoregulatory control system concern the number of compartments by which the body is represented, and the structure of the controller. This paper discusses the identification proc...
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The main problems in modelling the thermoregulatory control system concern the number of compartments by which the body is represented, and the structure of the controller. This paper discusses the identification procedure using an instrumental variable method, of a model based on measurements with newborn infants in a specially designed closed circuit calorimetric system, Various model structures have been simulated. A comparison indicates heat production to depend on the mean skin temperature only, whereas sweating, if occuring at all, is governed by the core temperature also. The magnitude of the residuals corresponds to the spontaneous fluctuations which always occur in a living organism, This indicates how the model explains all that can be explained from the measured data.
The problem of control and estimating the reliability of a complex stochastic systemsmodelling is examined. In order to solve this problem the estimates of statistical characteristics of random processes and fields a...
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ISBN:
(纸本)0080334520
The problem of control and estimating the reliability of a complex stochastic systemsmodelling is examined. In order to solve this problem the estimates of statistical characteristics of random processes and fields are used. A new method of computing the distribution function of spectral density and correlation function of random processes and fields is suggested. We discuss the new results in application of curve estimates by Parzen and Rozenblatt to estimate the distribution density of random processes and fields. The effective and quasi-effective estimates for variance and mathematical expectation of non-stationary processes are observed. A new method of statistical simulation of multidimensional random fields, defined by spectral decomposition, is suggested. The numerical algorithms of a parametric modelling of some classes of random functions are considered.
The techniques of the integrated circuit statistical analysis that is based on the common use of both statistical modelling and circuit experimental statistical analysis is suggested. The technique is intended to dete...
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ISBN:
(纸本)0080334520
The techniques of the integrated circuit statistical analysis that is based on the common use of both statistical modelling and circuit experimental statistical analysis is suggested. The technique is intended to determine the interrelation between circuit yield or circuit reliability on the one hand and the dimensions of elements or the parameters of production technological processes on the other hand. To illustrate the technique two problems of statistical optimization of a concrete circuit have been solved according to the criterion of circuit yield.
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