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A new algorithm of tetrahedron determination applied to the SVPWM control of four leg inverters is presented in this work. Indeed during the last years two main families of works were existing under this subject, the first one used the alphabetagamma frame , while, the second one used the abc frame. In this algorithm, it is proposed a new method for the determination of the reference vector location...
In this paper, we introduce a dead-time compensation method of a 600 KW electrical balance of plant (EBOP) with LC filter for molten carbonate fuel cell (MCFC). LC filter is adopted to reduce harmonics generated by PWM inverter and a filter controller suppresses resonance of LC circuit. Dead-time is inserted to prevent a shoot-through of dc-link and lots of methods for dead-time compensation have...
In this paper a method is proposed for compensating the dead-time in a synchronous rotating reference frame, which is suitable for general-purpose inverters. This method for digital harmonic detection is based on resampling and feedback theory, and a digital harmonic detecting system is designed. According to feedback theory, a filter can be designed to take the direct current Ip (Iq), and ip (iq)...
On the basis of the research on grid-connected technology of distributed generation system, in order to extend the full advantage of single-phase photovoltaic grid-connected energy and gain rapid electric energy conversion and high quality electric energy and achieve accurate control and reactive power and harmonic compensation, a control scheme of grid-connected in conjunction with harmonics presented...
A microcontroller based advanced technique of generating sine wave with minimized harmonics is implemented in this paper. The proposed technique ldquoimpulse-sine productrdquo aims to design and implement a voltage regulated inverter with ripple free and glitch free output sine wave that can operate electronic devices efficiently. The output voltage of the inverter is regulated by a feedback loop...
This paper examines the techniques which can be used to generate sinusoidal pulse width modulation (SPWM) utilizing minimal resources of a low-end microcontroller. Different techniques are evaluated, bit-banging look-up table (LUT) routines are advocated for certain purposes, programming algorithms are considered for efficiency, and methods of harmonic suppression are reflected upon. Finally, feedback...
In this study, the design and implementation of a microcontroller-based single phase on-line UPS (Uninterrupted Power Supply) with PFC (Power Factor Correction) were made practically. SP-320-24 SMPS (Switch Mode Power Supply) module was used to correct the input power factor. Input power factor value was held at the desired value in uninterrupted power supply topologies. In the realized system, two...
In the absence of an overhead line in maintenance workshops, there is a requirement to power the train from a shore supply in order to provide a DC Bus for the train inverters and battery chargers during maintenance activities. In this paper we describe a new way to supply the DC Bus, using the industrial 3 phase voltage supply, without any extra active components. With this method we respect all...
Acoustic resonance in HPS lamps can be avoided by using a controlled PWM inverter and third harmonic injection. The crest factor can also be reduced by harmonic injection. This paper proposes to use of the modulation index adjustment as a method of eliminating the transformer at the output of the ballast as well as maintaining the lamp nominal power during its lifetime. An ignitor for high-intensity...
This paper presents a new hybrid current control scheme for dead-time compensations and power density optimization of grid-connected dc/ac inverter. A sliding mode controller is designed for compensating the dead-time nonlinear operations, and a PI controller operates in the linear areas. According to the SMC controller output, the unnecessary gate drive signals are removed and the counter side switch...
Voltage or current converters generate discrete output waveforms, which require large inductances connected in series with the respective load to generate the desired current waveform. Mostly, neither the voltage nor the current waveforms are as expected and also have distorted voltages and currents waveforms produces harmonic contamination, additional power losses, and high frequency noise. In this...
Pulse width modulation (PWM) switching technique is commonly used in full bridge converters to overcome the bulky filter requirements and efficient voltage control, at the cost of higher switching losses. However, all PWM techniques not only cause circuit complexity but also need high frequency switches such as MOSFETs with high conduction drop causing lower efficiency. This paper presents a novel...
It is necessary for control of a PWM inverter to consider the sinusoidal transient effect and the load unbalances distribution. This paper propose a new control method for a three phase four wire PWM inverter having an output LC filter to achieve the three phase sinusoidal voltage. An observer used to predict and estimate the state variables for one step ahead. A fuzzy controller has been used to...
This paper presents a novel topology of a three-level current source PWM inverter used for a grid connected power conditioner. The circuit can be operated at higher switching frequency because all power switches are connected at common-source configuration. Using this common-source current-source inverter (CS-CSI) the number of gate drive power supply can dramatically be reduced into only a single...
This paper proposes a multirate state estimator for grid connected PWM inverters with LCL-filter usually found in high power variable speed wind turbines. The proposed state estimator reduces significantly the high frequency components resulted from the PWM operation on the estimated state variables. Furthermore, the proposed multirate estimator does not introduce additional dynamics under nominal...
PM motor drives are widely used for high performance servo applications. However, SPM motor has imperfect sinusoidal flux distribution which causes harmonic current. Dead time of the inverter and current measurement error lead to harmonic current, too. In this paper, the authors propose harmonic current suppression control of PM motor by using repetitive perfect tracking control with PWM-hold model...
This paper presents different schemes of state space vector pulse width modulation (PWM) for three-leg voltage source inverter. The analysis is performed with respect to switching losses and total harmonic distortion. Matlab /simulink programs are derived to illustrate the switching pattern for different schemes of space vector modulation (SVM). They are used afterwards to calculate harmonic values...
In the networking operation of wind power generation, grid-connected inverter is important for energy conversion and transmission. But the output current with harmonic component is increased due to the inverterpsilas low switching frequency of PWM signal. In order to reduce the harmonic current of grid-connected inverter, hybrid filter is used in the design of the grid-connected inverter in this article...
Synchronous optimal pulse width modulation (SO- PWM) techniques provide an appropriate solution to the increasing demand on very low switching frequencies of power semiconductors, in order to reduce switching losses. The shape of their pulse patterns is offline computed, and the modulation techniques assume a steady state operation of the drive system. Medium voltage drives when applied to the retrofit...
Subject of this contribution is a novel PWM controlled inverter of the kW power range, feeding a multi- mass ultrasonic motor (MM-USM) via a LLCC-type filter. The system is designed in a way to reduce the total harmonic distortion of the motor voltage and to locally compensate for the reactive power of the motor. Operating a three- level inverter with PWM pattern of eliminated low-order harmonics...
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