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This paper presents a novel prototype of a current source resonant inverter using insulated gate bipolar transistors for driving a streamer reactor, streamer generation technology has been recognized as one of the best methods for water treatment, disinfection, industrial wastes utilization, and so on. However, some technological difficulties related to efficient streamer production have been significant...
A novel current-sharing control scheme is presented for redundant parallel inverters. The control scheme employs the share bus which interconnects all the parallel inverters to transfer synchronous signal and average current signal. Current-sharing of all the parallel modules is realized through distributed average circuit. Average current is subtracted from the output current of each parallel inverter...
In inverters, distortions of output sine voltages caused by factors like dead-times of power switches can be well compensated by instantaneous voltages and/or currents feedback regulators such as PID or repetitive controllers. However, in our experiments, we found that the dead-time differences between inverters would result in significant harmonic circulating currents, and instantaneous regulators...
3-phase current-source SMES-UPS based on toroidal field superconducting coils (TFSC) is introduced in this paper, which serves for the exciting power supply (EPS) for TFSC when the power grid is in order, as well as for uninterrupted power supply (UPS) for the cryogenic and vacuum system once the deep voltage sag or other grid faults are detected. In the case of former, by controlling active and reactive...
Many single and three-phase converters are well developed, and covered up in most of electric markets. It is used in many applications in power systems and machine drives. however, an exact definite output signal from the dc side still not recognized. The waveforms of output voltage and current demonstrate an imperfect dc signal and constitute losses, harmonic distortion, low power factor, and observed...
Purposely generating chaos-chaotifying control, when it is useful or beneficial, becomes one of the focuses in chaos engineering. In this paper, the direct time delay feedback is proposed for chaotifying control of permanent magnet synchronous motor (PMSM). The direct-axis or quadrature-axis stator voltage is used as manipulated variable, and the direct-axis or quadrature-axis current is used as time...
In the distributed AC supply system without control interconnection, the parameters unbalance because of nonuniformity between the unit inverters is inevitable. The supplier unit is difficult to share power properly. Based on the digital control inverter with instantaneous capacitor-current feedback, the affection to power sharing of the filter inductance and equivalent line impedance are analyzed...
This paper presents a new constant power control of high frequency electronic ballast for a metal halide lamp based on the phase-locked loop (PLL) technique. First, the PLL is employed as a feedback mechanism to improve the resonant frequency variations caused by lamps aging or an impedance difference between used lamps characteristics. The proposed system can adjust the operating frequency to sustain...
This paper introduces the structure of synchronous reluctance with permanent magnet (SR-PM) motor and its principle of direct torque control (DTC), especially focuses on characters of DTC in SR-PM motor. Then the (position/speed) sensorless strategy of SR-PM motor is studied. The key point of sensorless control is estimating the torque angle delta precisely. This paper presents two different compensating...
New nonlinear current control methods are developed for single-phase power factor corrected (PFC) AC-DC converters. The control methods combine input current feedforward with partial feedback control based on the switch current to achieve sinusoidal input current and unity input power factor. The nonlinear control methods don't suffer from the limitations of conventional linear (average) current control...
The dynamic behavior of DC-DC converters is analyzed on the basis of a state-space averaged model including the feed back loop. The low frequency ripple behavior of DC-DC converters is analyzed in s field. A buck DC-DC converter is used as an example. The condition causing oscillation and impulse during starting period and in case of input perturbation is obtained. The output to input voltage transfer...
A magnetically levitated induction motor is a multivariable, nonlinear and strong coupling system. In order to achieve the rotor suspending and working steadily, it is necessary to realize dynamic decoupling control between torque force and radial suspension forces. In this paper, a method based on inverse system theory is used to study on decoupling control of magnetically levitated induction motors...
This paper presents a robust nonlinear controller for speed and flux control of primary type linear induction motor (LIM) drive. The proposed controller is designed based on combination of input-output feedback linearization and sliding-mode (SM) control taking into account the LIM end effects. The stability of proposed composite controller is proved by Lyapunov theory. The effectiveness and validity...
Based on the detailed analysis of the series resonant high frequency link sine-wave inverter operational principle, a system modeling methodology is presented using the sampled data. For this special modeling application, a black-box approach is described based on the data which are gotten from simulation or experimental results. And this approach aims at generating discrete-time small-signal linear...
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