In this paper, a simple and low-cost open-circuit fault detection identification method for pulse-width modulated (PWM) voltage-source inverter (VSI) employing permanent magnet synchronous motor is proposed. An of power switch in the PWM VSI changes corresponding terminal voltage introduces distortions to each phase voltage. The proposed diagnosis employs model reference adaptive system techniques requires no additional sensors or electrical devices detect condition identify faulty switch....

Generally, there exists a voltage distortion or nonlinear gain between the reference and output voltages in pulsewidth-modulation (PWM) source inverter (VSI). Nonlinearity varies with operating conditions, such as temperature, direct current (dc) bus voltage, phase level. Also, nonlinearity affects machine distortion, torque pulsations, degradation of control performance. In this paper, PWM VSI is analyzed new online estimation method based on model adaptive system proposed to compensate...

The sensorless controlled brushless DC motor with trapezoidal back EMF has been studied. Since the detected position information on rotor some uncertainty, cannot be driven a maximum torque. To investigate nature of torque in motor, characteristics as function commutation delay (or timing error) have analysed. It shows that generation is influenced by and single point. This point changed rotating speed load conditions. Therefore, it needs to adjusted at every operating However, if condition...

A new online voltage distortion observation method against the motor parameter uncertainty of a permanent-magnet synchronous is proposed to estimate time-varying pulsewidth-modulation voltage-source inverter. This estimation based on model reference adaptive system.

In this paper, LLC series resonant converter with current-doubler as a rectification circuit for secondary side is proposed. The generally used the high voltage input and low output application to get efficiency characteristics reduced transformer turn ratio. However, an inductive not in generally. When there like current-double on side, are changed. using coupled inductor We verify that affect characteristic of primary by mathematical analysis. Finally, analysis results proved simulation...

In general, there exists a voltage difference between the reference and output voltages in pulse-width-modulated (PWM) voltage-source inverter (VSI). This or distortion is caused partly by intended blanking time inherent characteristics of switching devices, which are dependent on operating conditions. The PWM VSI analysed new online estimation method for permanent magnet synchronous motor (PMSM) proposed to compensate time-varying distortion. not based direct observation but an indirect...

Recently, permanent magnet synchronous motors are applied to various applications such as electric vehicle, aerospace, medical service, and military due several outstanding characteristics. Because of the importance high reliable operation in these areas, many researches which related fault detection diagnosis inverter systems conducted. In this paper, a new simple method voltage source for motor is proposed. The feasibility proposed proved by simulation experiment. By experiments, rapid...

This paper proposes a simple position observer based on the instantaneous power and tuning procedure for proposed in driving surface-mounted permanent magnet synchronous motor. In of three-phase system, imaginary real powers have information related to velocity. Using power, difference between rotor estimated is calculated. For easy design, gain parameters are described as bandwidth observer. The proper expressed terms desired load transient response, system inertia, permitted acceleration...

This paper presents a study on current control of PM synchronous motor which is fed by two-level voltage source inverter in the high modulation index area. In order to increase dynamic response and extend speed limit caused voltage, overmodulation methods generally used. However, ripple region generates ripple. Because this ripple, controller with bandwidth makes entire system unstable. paper, new compensation has been proposed. By proposed method, dynamics can be improved stable achieved.

This paper presents a new single carrier wave comparison PWM method for 3 level phase Vienna type rectifier. The theoretical background the is presented. model this rectifier reviewed briefly and voltage unbalance problem according to offset duty analyzed. Finally, simulation experimental results prove effectiveness of analysis results.

This paper presents a fault detection method for phase open in three-phase diode rectifier including DC link reactor to improve the power factor. The is based on harmonic components ratio of 1st and 2nd order harmonics 6th voltage ripples when any one three phases opened. proposed algorithm detects without information load conditions performance verified by simulation experiment.

This paper presents the structure of an auxiliary power unit for railway vehicles to reduce amount electrical energy conversion and increase efficiency. An is a key device supplying various control vehicles. Isolation required as this provides necessary passenger car. Therefore, high-efficiency isolated LLC converter has been mainly applied. However, poor performance in response voltage variation. To overcome problem, existing system implemented by two stages APU : (stages installing...

In this paper, a new PWM method is proposed to reduce input current THD of Rectifier. the carrier comparison for rectifier, triangle wave generally used as wave. However, large d-axis ripple by can be source THD. in which saw tooth Depending on phase voltage commands, one rising or falling selected. Furthermore, switching losses are minimized selection pole method. The simulation results shown and usefulness verified performance between conventional methods.

The back emf harmonics of a PM synchronous motor is the main source torque ripples. ripples make mechanical vibration at low speeds and acoustic noise high speeds. feed-forward harmonic currents compensation may reduce speeds, but can't be reduced due to limited bandwidth current controller. In this paper, ripple reduction algorithm for wide speed operating ranges proposed. voltages that cancel 6 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

The mechanical vibration of a PM synchronous motor at low speeds due to the back emf harmonics may be serious problems in some application such as MDPS(Motor driven power steering), electric vehicles. In this paper, torque ripple reduction for an interior including is proposed. dq flux linkage permanent magnet are estimated on real time by using currents system and model MRAS observer. Based harmonics, harmonic reducing ripples compensated reference currents. estimation observer proposed...

Present study analyzed the efficiency characteristics of LLC converters having current doubler rectification circuits. A circuit has a coupled inductor as on secondary side output terminal converter. generally requires inductors however, characteristic an converter preclude inclusion its side. This problem is resolved here by proposing, system that very small inductance values and uses terminal. The proposed advantageous compared to center tap systems typically used at present, confirmed...

In this paper, new sensorless active damping method of the grid-connected LCL filter for a three-phase PWM inverter is proposed. The resonance component capacitor voltage observed by simple MRAS (Model Reference Adaptive System) observer without additional sensors or circuits. implemented feed-forward compensation current controller. validity proposed verified simulation and experiment.