International audienceParametric oscillators have been well studied but currently are not used often. Nevertheless, they could be a low-phase noise solution, at least outside the frequency bandwidth of the resonant circuit. The theoretical aspect of parametric oscillations is briefly reviewed in this paper. Indeed, the basic theory of a simple resistance-inductor-capacitor (RLC) circuit working in parametric conditions easily can be extended toward a resonant loop that includes a quartz crystal resonator. Then, as an application, this study is transposed to a quartz crystal oscillator that has been modeled and tested as a first ptototype. Simulation results are compared with those actually obtained
Development of the design of a synchronous electric motor with six C-shaped stator teeth, the rotor axis of rotation of which is displaced relative to the axis of rotation of the output shaft. The rotational speed of the output shaft is equal to twice the rotational speed of the stator magnetic flux. Determination of the phase shifts of the supply voltages in time and the spatial position of the stator windings. Visualization of the principle of operation of the electric motor under consideration, namely, step-by-step observation of the position of the rotor in space, when the sinusoidal voltage wave changes by an angle equal to π, with a step of π/6. Mathematical description of the engine under consideration, with all the structural features of the stator-rotor magnetic circuit. In the course of the work, analytical calculation methods were applied. As a result of the study, the basic laws of operation were determined, as well as the design and principle of operation of the considered electric motor with a suspended rotation speed.
This paper presents the STATCOM model in PSIM, which compensate reactive power and current harmonics from the non-linear load. Reactive power consumption and harmonics current of non-linear load given from measurement. The model of STATCOM is a multi-level voltage inverter. Constant system voltage, power factor and harmonics currents are controlled. All modes are realized and plots are plotted.
On the level with well-known merits Russian "Russia UES" Incorporated restructuring and the creation of electric power market cause the problems connected with the effective usage increase of existed system interconnections and their static and dynamic stability guarantee. One of the solution ways of these problems is the controlled or flexible system interconnections (FSI) use.In this paper one can find the results of flexible system interconnections alternative variant on the basis of the magnetic bias controlled reactors (CR TS) studies, specially on the development of CR TS device mathematical model and the development of the principles of CR TS controlled system.
The system of equations for instantaneous values, written according to Kirkhgoff`s laws for electric and magnetic circuits of CR TS device, is used for the mathematical model creation.The model allows getting a full number of static angular and adjusting characteristics of the object, which are necessary for acceptance and of scheme and constructive solutions on CR TS device designing on an industrial scale. The CR TS device bias current adjusting system was developed on the basis of the mathematical model created. This is a non-linear proportional adjuster with bias time "constant" neutralizing on the whole working range of current change.Index Terms--controlled ferromagnetic elements, flexible alternating current transmission systems (FACTS), magnetic bias controlled reactors (CR), mathematical simulation, bias current controlled system.
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