A new maximum power point tracker (MPPT) for a grid-connected photovoltaic system without solar array current sensor is proposed. The information obtained from the sliding-mode observer and fed into MPPT to generate reference voltage. parameter values such as capacitances can be changed up 50% their nominal values, linear cannot estimate correct state under variations noisy environments. structure of simple, but it shows robust tracking property against modeling uncertainties variations. In...

A new active clamping zero-voltage switching (ZVS) pulse-width modulation (PWM) current-fed half-bridge converter (CFHB) is proposed in this paper. Its snubber (ACS) can not only absorb the voltage surge across turned-off switch, but also achieve ZVS of all power switches. Moreover, it be applied to conversion topologies and its operation as well structure very simple. Since auxiliary switches circuit are switched a complementary way main switches, an additional PWM IC necessary. In...

A new zero-voltage-switching (ZVS) phase-shift full-bridge (PSFB) converter with low conduction losses is proposed. It based on the PSFB series-connected two transformers, which features wide ZVS ranges. By adding a capacitor, proposed overcomes disadvantage of converter, such as high circulating energy. Furthermore, turns ratio transformers can be increased well. Therefore, efficiency achieved. Operational principles and experimental results for 100-W (5 V, 20 A) prototype are presented to...

A new phase shift full bridge (PSFB) converter with series-connected two transformers is proposed. The proposed shows wide zero voltage switching (ZVS) ranges and no output inductor needed since each transformer individually acts as an or a during different times of the cycle. operational principle, large signal modeling, design equations are presented. Experimental results demonstrate that can achieve significant improvement in efficiency for 100W (5 V, 20 A) telecommunication on-board power supply.

A method for the robust position control of brushless DC (BLDC) motors is presented. The linear quadratic controller plus load torque observer used to obtain an approximately linearized BLDC motor system AC servo, using field-orientation method. gains are obtained systematically from a discrete state space analysis. robustness without affecting overall response. disturbance detected by zero-observer unknown and inaccessible input, feedforward compensated requiring noisy current information....

Various bounds for the traces of solutions algebraic Riccati and Lyapunov matrix equations are established in continuous discrete domain, respectively. The presented results give lower sum eigenvalue solutions.

The paper presents a theoretical analysis of the correlation between carrier-based unipolar PWM (CPWM) and space-vector (SVPWM) for entire modulation-index range multilevel invertors, including overmodulation. By presenting corresponding parameters vector redundancies in zero-sequence function, has matched SVPWM technique. Carrier-SVPWM discontinuous-PWM methods capable obtaining any approximate optimum offset are proposed. Among them, minimum-common-mode can attain proper balancing...

A DSP-based nonlinear speed control of a permanent magnet synchronous motor (PMSM) which is robust to unknown parameter variations and measurement error presented. The model reference adaptive system (MRAS) based adaptation mechanisms for the estimation slowly varying parameters are derived using Lyapunov stability theory. For disturbances or quickly parameters, quasilinearised decoupled including influence on PMSM derived. Based this model, boundary layer integral sliding mode controller...

A variable-structure observer for solar-array current estimation in a photovoltaic power-generation system is presented. The solar-array-current information obtained from the and fed into maximum-power-point tracker to update reference voltage. parameter values such as inverter DC-link capacitances can be changed by up 50% their nominal linear cannot estimate correct state under variations noisy environments. configuration of simple, but it shows robust tracking performance against modelling...

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 resonant energy-recovery circuit for a plasma display panel (PDP) employing gas-discharge current compensation method is proposed. Its main concept to make the biased by V/sub s/ and 0V instead of s//2 in charging discharging PDP, respectively. This operation helps PDP be fully charged discharged all switches turned on under zero-voltage switching. Moreover, since inductor can compensate large current, stresses power considerably reduced have turn-on timing margin, which ensures no voltage...

An improved nonlinear speed control of a permanent magnet synchronous motor (PMSM) is presented. A quasi-linearized and decoupled model including the influence parameter variations measurement error on PMSM derived. Based this model, boundary layer integral sliding mode (BLISM) controller to improve robustness performance if designed compared with conventional controller. load torque observer its asymptotic in scheme. By employing proposed scheme, both transient steady state responses are...

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.

A state feedback control that can be easily implemented is proposed to improve the stability and dynamic characteristics of resonant power converters. An important characteristic system with reduction order in discrete time domain. The design parameters are reduced by one, compared those conventional linear control, procedure similar a variable structure (VSS) control. illustrated its application series converter. experimental results confirm validity control.< <ETX...

A new isolated boost DC/DC converter suitable for a low-input-voltage application is introduced. The proposed features low switch current stresses, wide range of input voltage, and inherent inrush protection, essential the design low-to-high-voltage conversion circuit. comparative analysis experimental results are presented to show validity converter.

This paper proposes a new method to detect mechanical faults of permanent magnet synchronous motors (PMSMs) under variable speed conditions. Several prior studies have proposed motor current signature analysis (MCSA) based methods for transient conditions; however, these limitations because they require the characteristic frequency or only verify performance restricted time-varying region. Thus, research outlined in this suggests detecting using stator currents. The uses two techniques,...

This paper proposes a method for detecting inter-turn short circuit faults of surface-mounted permanent magnet synchronous motors (SPMSMs) based on reference voltage. The proposed consists three steps. First, from the mathematical model faulty PMSM, voltage vector in dq-frame is separated into healthy and Second, further decomposed DC component 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> harmonic component. Third, relationship...

Abstract Motors, which are one of the most widely used machines in manufacturing field, take charge a key role precision machining. Therefore, it is important to accurately estimate health state motor that affects quality product. The research outlined this paper aims improve fault severity estimation by suggesting novel deep learning method, specifically, feature inherited hierarchical convolutional neural network (FI-HCNN). FI-HCNN consists diagnosis part and part, arranged hierarchically....

A robust speed control scheme for a brushless DC (BLDC) motor using an adaptive input–output linearisation technique is presented. By this technique, the nonlinear model can be linearised in Brunovski canonical form, and desired dynamics obtained based on model. This however, gives undesirable output performance under mismatch of system parameters load conditions caused by incomplete linearisation. For response, disturbance torque flux linkage will estimated reference technique. The...

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...

A two-mode overmodulation in two-level VSI using the control principle between limit trajectories is presented. The used to ensure linear modulation from range of space vector pulse width six step mode and employed get better performance overmodulation. proposed verified by software simulation.

A new sliding mode control with a nonlinear time-varying function is presented. In the conventional control, switching surface linear function, and therefore speed of response relatively slow. Here we present method using timevarying instead surface.

A novel current-fed energy-recovery sustaining driver (CFERSD) for a plasma display panel (PDP) is proposed. It uses the current source to recover energy stored in PDP, which also provides zero-voltage switching (ZVS) of all main switches and improved operational voltage margin. Furthermore, it features lower conduction loss faster transition time. well suited wall-hanging color televisions (TVs).

This paper presents a zero-voltage switching (ZVS) two-transformer full-bridge (TTFB) pulsewidth modulation (PWM) converter with lossless diode-clamp rectifier for plasma display panel sustaining power module (PSPM). The TTFB has series-connected two transformers which act as an output inductor well main transformer. Although the naturally doubled leakage due to contributes achieve ZVS of lagging leg, it creates serious voltage ringing across diodes. results in heavy stresses Thus...

This paper proposes a novel method that uses stator current signals to detect motor faults under operational speed and load torque conditions. Previous studies on signature analysis (MCSA) have been devoted developing methods in non-stationary conditions; however, they limitations. Conventional require much domain knowledge or parameter selection for signal decomposition, are applicable limited variable Thus, this new feature, drive-tolerant residual variance (DTCRV), fault detection....