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According to the powertrain and vehicle parameters of a self-developed parallel hybrid electric vehicle, the longitudinal dynamics analysis was carried out, and the simulation model was built. Using the dynamic programming global optimization algorithm, the shift schedule for a HEV automated manual transmission was studied. The results show that: through the obtained optimal economy shift schedule,...
Though the combination energy-saving measure for mechanical oil production well plays a very important role in improving the whole economic efficiency of the oil field, it does not reach to the optimal saving status. Except for the increasing inputs of saving measure, optimizing of the combination of kinds of saving equipment and technology is needed for enhancing the economic efficiency of the combination...
In this paper, a new control strategy is proposed to improve the performance of a wind generator system composed of a three-phase PMSG and a Back-to-Back three-phase to single phase converter. With the use of the large inductance of the synchronous generator, the control method minimizes the generator torque ripple when the system supplies a single-phase load. The problem arises from the fact that...
This paper presents a method of misfire diagnostic detection on the LPG vehicle. The misfire rates of the catalytic converter irreversible damage temperature in full-working-condition and the misfire rates based on the exceeding OBD system emission limit in GB I test are respectively confirmed by Class A and B misfire diagnostic calibration experiments. The misfire diagnostic method in this paper...
With the increase of unit capacity of hydroelectric sets, the weight of rotating parts, the axial hydraulic thrust as well as the eccentric force and the unbalanced magnetic pull, the electromagnetic torque on generator pedestals will increase remarkably. Therefore it is of great importance to analyze the vibration response of large-scale hydropower house under vibration loads of hydroelectric unit...
A novel field modulated magnetic gear (FMMG) with concentric configuration is proposed and introduced to the drive train for a wind turbine system, which eliminates the vibration, noise and lubrication problems of mechanical gearbox and avoids the size and weight issues of directly-driven wind turbines The efficiency and reliability are improved simultaneously. Based on the static field computations...
In this paper has been tried to optimize the solar energy in a new way according to the increasing importance of renewable energies and a sample biaxial sun tracker is built. There are three algorithms for tracking the Sun: first algorithm, move the plane in circular coordinates in the small ranges, then find the point with the best voltage for its field of work and oriented to that and then repeat...
Six-phase motors are widely used in industry, for they can be useful in increasing motor capacity with limit voltage level, and be more reliable in continuous operating and be more robust in performance controlling. Up to the present, there have been many researches on six-phase motors, and they are usually analyzed by analytical methods. However, most of six-phase motors are used with variable frequency...
The traditional control strategies of the permanent magnet synchronous generator (PMSG) based on rotor flux orientation have unconquerable drawbacks, such as the reactive power exchange by the id=0 control and the complicated calculation by the unity power factor (UPF) control. A novel UPF control strategy of the PMSG using stator flux orientation is proposed in this paper. The simulation results...
Model of wind turbine system contains lots of different components and most of them have reaction to each other. This character makes the software model describing of wind turbine system become difficult. There is also another problem is that even if we modeling this system in software, its stiff system character made the real-time simulation become difficult. This paper proposes a kind of half-physical...
In order to increase its performance and quality, lay up molding method is adopted to form large-scale composite wind turbine blade. Fibre lay-up of wind turbine blades must be multi-directional lay-up because of its complexity of bearing load and multi-direction of internal stress. Lay-up algorithm is the basis of fibre mold. Lay-up algorithm and generating technology of 0°, ±45°and 90° for blade...
Energy absorption by a device in forms of a pendulum plate is analyzed in this paper. A 1/10 scale model of the prototype is constructed and tested under various of wave conditions in a wave flume. Moreover, capture width is studied experimentally as a prevalent physical. The results are compared with several other types of wave energy converters, and it is indicated that the performance of the device...
Rotor-coupling-rotor system of marine power plant will temporarily install on the rigid foundation for the delivery inspection, all the dynamic parameters are always satisfied with the design requirements; However, once it is installed on the real flexible foundation, rotor vibration of wide variable rotate speed get complicate because of the coupling between misalignment of isolator and dynamic meshing...
In the high wind speed region, in order to more effectively fulfill the power limitation control for the DFIG (Doubly-Fed Induction Generator) wind Power generation system, a constant power control strategy, with nonlinear control theory, is proposed via the pitch angle of vane and electromagnetic torque control simultaneously. The simulation results show the correctness and feasibility of the proposed...
Cutting force is an important parameter in the design of bush reciprocating cutter. A reciprocating single blade cutting test equipment was made in this paper. Three factor and four-level complete test was done to study their influence on maximum cutting force. Three factors are sliding cutting angle, cutting edge angle, and crank speed. It was found that: the significant order of influence on maximum...
In existing load flow model of induction generators, the magnetizing path is moved to the stator terminal, parallel to the shunt capacitor, yielding the same stator and rotor currents. The power output is equal to the mechanical power input. The stator resistance and the machine loss are ignored. It can not provide the initial condition for the dynamic and control schemes requiring the exact stator...
In this paper, NACA0018 airfoil is proposed to be open able at low tip speed ratio to work as drag device and then be closed to take the normal blade geometry of the airfoil at higher tip speed ratios to work as lift device. A moving mesh technique was used to analyze 2D unsteady flow around VAWT modeled with airfoils opening angles set to 60, 45, 30 and 15 degrees from main axis using CFD solver...
This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
This paper suggests a hybrid, vertical configuration of multi-bladed and multi-stage (multi-S) Savonius rotors for capturing and storing wind energy. The intended hybrid design is expected to provide small- or near-medium-sized wind turbine of unique design in terms of the gained energy and speed factors. The whole system is dedicated for stand-alone power plants. Integration of wind power into electricity...
To achieve influence of underwater windmill's flow parameters and structure parameters-related changes with the hydrodynamic characteristics, an underwater windmill's additional contraction device is devised. According to the orthogonal experimental design, flow velocity, shrinking angle, locating range and outlet diameter are selected as four factors to carry out an L9 (34) orthogonal experiment...
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