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The periodic sampling strategy simplifies the analysis and implementation of generator excitation control in power system. However, it may lead to unreasonable distribution of the resources because the sampling frequency has to indicate the worst scenario of the system operation. The paper applies the self-triggered control algorithm to design the generator excitation controller of power system. The...
In order to increase the work efficiency of oil pumping system, the key problems in the operation process of oil pumping system are summarized. The experiment system for oil pumping is established, the mathematic models of oil pumping system are analyzed, objective function, boundary condition and calculated method in oil extraction system are discussed, the optimum control strategy in the operation...
In this paper, a model of the wind turbine (WT) with direct-drive permanent magnet generator (DDPMG) and its associated controllers is presented, based on which the small signal stability analysis model is derived. As detailed models of wind farm can place and unbearable computational burden on simulations programs, there is a need to reduce wind farm order dimension. Focusing on the most relevant...
Currently, DC motor of automatic doors speed regulating system utilizes PID control which has parameters tuning difficulties, poor stability, and imprecise control. To solve the above existent problem, this paper adopts the control strategy of fuzzy algorithm combining with PID control, introducing method of fuzzy PID control used in DC motor speed regulating system of automatic doors. Through establishing...
To acquire higher performance of direct-operated electro-hydraulic proportional-reducing valve, driving circuit and controller was developed. Simulation software, AMESim, was used to develop the model of the test bench according to construction and working principles presented in this paper. The results of simulation and experimental test, including pressure control characteristics and frequency response...
The paper analyzed the application of complex torque coefficient (CTC) approach based on the IEEE 2th benchmark of SSR. It deduced mechanical and electric CTC, and studied the influence of unstable model outside the shaft. If there is no unstable model, the CTC can be computed just by the transfer function. Otherwise, there is no rigid CTC, and additive simulations are needed to verify the analysis...
The paper analyzes the basic characteristics of the stable response of electromagnetic torque of synchronous generator, deduces the main calculation procedure of complex torque coefficient (CTC), and validates them by simulation. The study shows, the apply condition of CTC approach is the linearity and stability of the system. Under a stable system, the CTC can be calculated by the transfer function,...
Photovoltaic power generation system implements an effective utilization of solar energy, but generally has very low conversion efficiency. Maximum power point tracker (MPPT) control is essential to ensure the output of photovoltaic power generation system at the maximum power output as possible. Photovoltaic cells model of photovoltaic power generation system and basic control algorithm is discussed...
Montmorillonite, iron oxide and the composite, were synthesized and characterized. The behavior and kinetics of arsenic sorption on the three kinds of adsorbent were investigated under neutral conditions. The results indicated that the sorption capacities of iron oxide are higher than those of montmorillonite and composite. The kinetic data of arsenic adsorption can be well described by Lagergren-second-order...
For instance the evaluation of an Olympic problems in this paper, Firstly we collected statistical data of various factors through the establishment of the model of grey relational degree. Then quantitative analysis using the model of these factors impact on the evaluation of the object and come to affect the degree of ranking. The use of a wide range of the models in agricultural economics, water,...
The article established a Matlab simulation model of Ni-MH battery based on Zimmerman equivalent circuit model according to the actual charging and discharging characteristics of Ni-MH battery. The simulation analysis shows that the model can not only represent the charging and discharging dynamics characteristics of the Ni-MH battery exactly, but also reflect some factors' influence such as temperature,...
Aiming at the linear and nonlinear friction characteristics that servo control system present, this paper brings up a novel identification approach, which decouples the servo system into a combination of a linear component and a nonlinear component in identification process. The system is converted to a structure which is a linear model plus a nonlinear feedback model. In order to avoid the effects...
The output of photovoltaic array has several corresponding local peaks of power-voltage curve with the existence of the shadow, In order to make the photovoltaic arrays continue to work in the maximum power point, need to create conditions for the model of the PV array, On the basis of the model, there are having some further detailed analysis and research about the characters of the local photovoltaic...
The articles on how to optimize the resources disposition are emerging one after another, since the implementation of the power system reform "separation of power plants from power grids and competitive bidding". All these indicate that further researches and explorations after breaking the monopoly are called for on how to carry on the market operation. This paper formulates and standardizes...
Electromagnetism drive is launcher which utilizes magnetic traveling wave produced by impulse or alternating current to drive projectiles with coil or magnetic material, essentially is a linear electric motor. The heat wasting affect coil gun's efficiency and capability, high temperature of driving coil will reduce its life, indeed burnout coil, and when enhancing firing rate, we need calculate effect...
Configuration optimization of physical prototype for 6–3–3 parallel mechanism was modeled mathematically, and then an idea of embedding finite element method in optimization algorithm was presented for solving optimizing model. In optimization design toolbox of ANSYS software, configuration optimization of the parts for the mechanism was realized by means of establishing parameterized model with parts,...
In this paper, we use the typical of basic ac modeling approach to establish Buck circuit in the continuous conduction mode (CCM), and obtain the open-loop control-to-output transfer function. Through analysis of the transfer function we design the corresponding compensation networks, which makes the main circuit designed have a good steady state and dynamic performance. On the basis of the theoretical...
In order to accurately analyze the trend of health state variation of aero-generator, a grey prediction model based on genetic algorithm is presented in this paper. Then use the original grey model and the optimized grey model respectively to carry out health state trend analysis of the aero-generator. On this basis, the two models were used to study aero-generator health trends, and compared with...
Aiming to the shell protection for the circuit, on the basis of analysising the relationship between the stress on passing the cover of protective shell and the least plastic flection stress, utilizing the principle of the wave front conservation, the equation is built to evaluate the impact resistance on protective shell, and the evaluation factor of the impact resistance can be extracted from this...
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