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In this paper, we propose the method to realize high efficiency control for IPMSM (Interior Permanent Magnet Synchronous Motor). In this method, we pay attention to the torque equation. We realize high efficiency control by controlling the vector angle of stator current. As for the high efficiency control, we define the optimum angle as the stator current angle which makes the torque biggest against...
In miniature magnetically levitated rotating machines, permanent magnet bearings are generally used for rotor levitation in the radial directions and electro-magnetic actuators are used for rotor stabilization in the axial direction. In this configuration rotor radial oscillations are unavoidable because no controllable force is applicable in these directions. Consequently, rotor damping relies entirely...
The paralleling DC/DC converters via primary current droop current sharing control is presented in this paper. Firstly, the steady state droop voltage characteristics are deduced from the output voltage regulation specification and then the parameters of the feedback weighted voltage resistor network can be determined accordingly. Hereafter, the inner loop voltage controller of the converter is designed...
It is well known that transition current mode control for power factor corrector can reduce the reversal recovery loss for the diode. This method can be realized using discrete control integrated circuit which requires zero-crossing detection circuit. In this paper, a novel control technique for digital-controlled power factor corrector to achieve transition current mode control is proposed. The switching...
This paper presents a unique implementation of the recursive Gauss-Newton, (GN), algorithm operated by maximum likelihood estimation for tracking and extracting the common current quality problems such as current harmonics. Moreover, this paper proves that the utilization of the ramp-comparison current controller, (the linear current controller), for the operation of the shunt power conditioner is...
This paper presents a mixed-signal power-factor-correction (PFC) control IC for the single-phase critical-conduction-mode (CRM) boost AC/DC converters. The peak current mode control is applied and analyzed by using the analog circuit. The voltage control loop is implemented in digital approach. This paper analyzes effect of the hysteresis band effect of the analog current comparator in current loop...
This paper investigates the control of a multi-level cascaded H-bridge STATCOM when used as a simultaneous active filter and VAR compensator. The control algorithms developed borrow heavily from control strategies used in variable speed drives, and use predictive current control and symmetrical PWM. A novel phase locked loop approach for the extraction of the harmonics and generation of the forward...
Using a conventional hysteresis current control for SRMs, the switching frequency varies dramatically and could exceed the limit of switching devices. This could lead to damages of switching devices and also reduce the reliability of the drive. To solve this problem, this paper proposes an additional adaptation in the conventional hysteresis current control for SRMs in order to keep the switching...
In recent years there has been much attention on the proportional plus resonant (P-R) current regulators for grid connected voltage-source converters (VSCs). Many strategies have been proposed for use of P-R controllers both in the stationary and in the synchronous reference frame that demonstrate VSC performance can be improved under non-ideal supply conditions such as supply asymmetry and supply...
The selection criteria of dc-link capacitor based on the optimal ac line current regulation strategy for the single-phase grid-connected photovoltaic (GCPV) system is proposed in this paper. The power flow of the GCPV system and the optimal ac line current regulation strategy are presented. The optimal ac line current regulation strategy can achieve dc-link voltage regulation in one ac mains cycle...
In recent years, the increase of non-linear loads in electrical power system has sparked the research in power quality issue. The shunt active power filter (SAPF) is a power electronic device which has been developed to improve power quality. The current control of shunt power filters is critical since poor control can reinforce existing harmonic problems. Various control strategies have been proposed...
Active power filter (APF) has been widely recognized as a substitute for classical passive L-C filter for eliminating the power line harmonics/reactive current due to nonlinear loads and switching devices. The tracking capability of the current controller dominates the performance of the APF. Since the required harmonic compensating currents are of periodic, the repetitive control may be considered...
This paper proposes a DC-DC buck power converter chip with a novel integrated PWM/PFM hybrid-mode control. The DC-DC converter chip with synchronous rectifier not only uses current-mode feedback control but also possesses constant-frequency-mode control and hybrid-mode control functions at the same time. Furthermore, the operational modes of the converter can be selected by an external voltage signal...
The paper presents an investigation on the direct instantaneous torque control (DITC) of a 1-hp four-phase 8/6 switched reluctance motor (SRM). In the proposed technique, the instantaneous phase torque was estimated in real-time using a pre-stored look-up table of measured static torque, T(i, ??), where phase current and phase flux linkage were input parameters. Therefore, a high-resolution encoder...
This paper presents a battery powered switched reluctance motor (SRM) drive constructed using two three-phase intelligent power modules (IPMs). It possesses integrated driving and charging capabilities. In driving mode, five legs of the two IPMs are used to form the SRM modified Miller converter, and the front-end DC/DC boost converter is constructed by the remaining leg. Proper current and speed...
A novel zero-voltage-switching pulse-width-modulated (ZVS-PWM) flyback dc/dc converter with an auxiliary resonant circuit is presented in this paper. The proposed circuit topology adopts the traditional pulse-width-modulated flyback converter with an auxiliary resonant circuit. In the auxiliary resonant circuit, the resonant inductance and the resonant capacitance is operated as a resonant circuit...
The hybrid recurrent fuzzy neural network (HRFNN) control permanent magnet synchronous motor (PMSM) drive system using rotor flux estimator is developed to control electric motorcycle in this paper. First, the dynamic models of a PMSM drive system and electric motorcycle are builted though experimental tests and parameters measurements. Then, a HRFNN control system using rotor flux estimator is developed...
This paper presents an implementation of controlled rectifier with power factor correction (PFC) using single-phase matrix converter (SPMC). A current control loop (CCL) using standard proportional integral control was used to implement PFC to correct the pulsating nature of the input current to almost unity power factor form with low total harmonic distortion (THD) level well below the acceptable...
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