Automated early detection and identification of switch faults are essential in high-voltage applications. Modular multilevel converter (MMC) is a new promising topology for such MMC composed many identical controlled voltage sources called modules or cells. Each cell may have one more switches failure occur anyone these The steady-state normal fault behavior will also significantly vary according to the changes load current timing. This makes it challenging problem detect identify as soon...

The quasi-Z source (qZS) cascaded multilevel inverter (CMI) (qZS-CMI) presents attractive advantages in application to photovoltaic (PV) power system. Each PV panel connects an H-bridge qZS (qZSI) form a generation module. distributed maximum point tracking and all modules' dc-link peak voltage balance can be achieved. However, it is the same with conventional CMI that second-harmonic (2ω) current ripples exist each qZSI It crucial for qZS-CMI design reasonable network parameters limit...

To mitigate global warming and energy shortage, integration of renewable generation sources, storage systems, plug-in electric vehicles (PEVs) have been introduced in recent years. The application (EV) the smart grid has shown a significant option to reduce carbon emission. However, due limited battery capacity, managing charging discharging process EV as distributed power supply is challenging task. Moreover, unpredictable nature generation, uncertainties associated parameters, prices,...

This paper presents a finite-control-set model predictive control (FCS-MPC) for grid-tied packed U cells (PUC) multilevel inverter (MLI). The system under study consists of single-phase 3-cells PUC connected to the grid through filtering inductor. proposed competitive topology allows generation 7-level output voltage with reduction passive and active components compared conventional MLIs. aim FCS-MPC technique is achieve, various operating conditions, current injection unity power factor low...

Modular multilevel converter (MMC) is a promising new topology for high-voltage applications. The MMC made of several identical submodules. For proper operation, each submodule can be considered as controlled voltage source where capacitor's should maintained at certain level. Besides, the minimization circulating current, which does not flow to load, crucial achieving stable and efficient operation MMC. interrelations among load capacitor voltages complicate control. This paper aims achieve...

The quasi-Z-source inverter (qZSI) is becoming a popular topology that can buck or boost input voltage without dc-dc converter and hence be used in transformerless configuration. Due to its single-stage conversion, the qZSI as an efficient grid-tie inverter. However, common mode current major problem topologies due absence of galvanic isolation. This paper proposes modified pulsewidth modulation (PWM) technique control qZSI, along with two extra semiconductor switches, reduce current....

This paper describes a newly developed speed sensorless drive based on neural networks. A backpropagation network is used to provide real-time adaptive identification of the motor speed. The estimation objective sum squared errors between target trajectory and model output. algorithm adjust speed, so that output follows trajectory. Backpropagation forces estimated follow precisely actual zero-speed crossing phenomena also described, experimental results are presented analyzed.

A field-oriented control method based on a predictive observer with digital current regulation of an induction motor, without speed and voltage sensors, is proposed. Measuring only stator currents estimating motor rotor fluxes by state variable pole selection the are controlled to be exactly equal reference at every sampling instant. The resulting estimated low sensitivity parameter variation, torque ripples reduced. proposed consists four parts: identification speed, derivation law,...

Conventional dead-time compensation methods, for pulsewidth-modulated (PWM) inverters, improve the current output waveforms; however, zero-current crossing effect is still apparent. This letter proposes a new method, based on angle domain repetitive control, to reduce distortions in PWM inverters waveforms caused by dead time and zero-crossing problem.

A resolver generates a pair of signals proportional to the sine and cosine angular position its shaft. new low-cost method for converting amplitudes these sine/cosine transducer into measure input angle without using lookup tables is proposed. The takes advantage components used operate resolver, excitation (carrier) signal in particular. This feedforward based on comparing those together with another shifted by pi/2. simple then estimate shaft through this comparison technique. poor...

This paper presents an adaptive observer (AO)-based model predictive control (MPC) for a multilevel flying capacitors inverter (FCI). The proposed system consists of midpoint dc-link three-cell four-level FCI feeding RL load. Using the actual load current, AO estimates accurately capacitors' voltages, which are fed to MPC algorithm by means hybrid considering both discrete and continuous variables. For real-time constraints, sufficient conditions given guarantee practical stability AO-based...

This article presents the design and implementation of solar-powered V/f controlled single-phase capacitor-start induction motor. Multilevel quasi impedance source inverter controls power flowing from photovoltaic (PV) array to a In solar powered drive systems, main concern is stable intended operation when subjected variations in generation PV array. For same environmental conditions, extraction different at torques for constant speed application. Due this, maximum with an MPPT algorithm...

Batteries are combinations of electrochemical cells that generate electricity to power electrical devices. continuously converting chemical energy energy, and require appropriate maintenance provide maximum efficiency. Management systems having specialized monitoring features; such as charge controlling mechanisms temperature regulation used prevent health, safety, property hazards complement the use batteries. These utilize measures merit regulate battery performances. Figures...

One of the key solutions to address issue energy efficiency and sustainable mobility is integrate plug-in electric vehicle (EV) infrastructure photovoltaic (PV) systems. The research proposes a comprehensive EV planning analysis tool (EVI-PAT) with solar power generation for micro-scale projects deployment Charging Stations (EVCS). For evaluation proposed infrastructure, case study Qatar University (QU) campus chosen integration charging PV evaluate performance presented framework. model...

A newly developed resolver converter, providing a pseudolinear voltage proportional to the shaft angle, is presented. This converter based on new concept involving absolute values of demodulated sine and cosine signals together with dedicated linearization technique. The enables instantaneous determination mechanical angle theoretical error nonlinearity below 0.011/spl deg/ over 360/spl range. practical performance this compared that 10/sup 5/ pulses per revolution optical encoder...

A novel and simple resolver-to-dc converter is presented. It shown that by appropriate processing of the sine cosine resolver signals, proposed may produce an output voltage proportional to shaft angle. dedicated compensation method applied almost perfectly linear output. This enables determination angle with reasonable accuracy without a processor and/or look-up table. The tests carried out under various operating conditions are satisfactory in good agreement theory. paper gives theoretical...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A new low cost converter topology is proposed for sinusoidal position encoders. The enables determination of the angle from sine and cosine signals encoder. When used with resolvers, implementation present scheme takes advantage available excitation signal to operate device. This trigonometric reference optimally generate an analogue equivalent a digital look-up table (LUT). mechanical without...

The switching lag-time, which prevents the phase shortage of inverter arms, causes serious distortions output voltage inverter. This effect is well known as dead-time effect. Several compensation methods have been proposed to improve waveforms. These approaches did inverter's improved waveforms however still suffer from zero-crossing phenomenon. A new approach overcome zero current clamping in voltage-fed PWM inverters proposed. paper describes analysis three-phase and scheme. conventional...

A new technique based on deadbeat control theory is proposed to induction motor stator currents under field-oriented control. Stator and speed were measured. Rotor fluxes are predicted using a state observer with variable poles selection. Then, the pulse-width-modulated (PWM) pattern of inverter controlled such that exactly equal reference at every sampling instant. From theoretical analysis, digital simulations, experimental results, following conclusions made. The controller permitted low...

The paper describes a new discontinuous carrier-based pulsewidth modulation (PWM) method for use in variable frequency drives (VFD) driven by three-level inverters. introduces three different switching patterns the full range of operating speeds. Depending on actual speed, proposed algorithm is developed to select most suitable PWM pattern that improves VFD performance. This results low imbalance DC-link capacitor voltage, and current distortions without increasing losses. Theory,...