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This paper presents a new asymmetrical single-phase multilevel inverter topology capable of producing nine-level output voltage with reduce device counts. In order to obtain the desired output voltage, dc sources are connected in all the combination of addition and subtraction through different switches. Proposed topology results in reduction of dc source, switch counts, losses, cost and size of the...
This paper proposes a configuration based on an a PR controller to enhance the power quality of a Single-Phase Five-Level Inverter (SPFLI). A sliding mode control is used to compensate the voltage harmonics and regulate the load supply. The proposed configuration implementing a sliding mode controller, a resonance regulator helps improving the dynamic response of the system and may target any specified...
The dynamic frequency stability issues in microgrids with large penetration of low inertia and intermittent photovoltaic (PV) systems can be improved by using virtual inertia (VI). A VI is the combination of energy storage system, power electronics converter and a proper control algorithm. This paper presents design and experimental verification of the VI in a PV-diesel generator based remote microgrid...
Repetitive control (RC) scheme presents an attractive solution to achieve excellent steady-state tracking error and low total harmonic distortion (THD) for periodic signals. RC can produce extremely large gains at fundamental and each harmonic frequency of reference signal to achieve all harmonics suppression. However, a DC-AC inverter always has uneven THD distribution, e.g. THD concentrates at 4fc...
Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. Various types of SVPWM strategies exist. The hybrid SVPWM strategy considers various SVPWM sequences and places the best performance sequence for a given reference vector and it proves to be superior in comparison with the conventional strategies. This...
A model predictive control (MPC) is proposed for a buck-type active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) to directly eliminate the dc-side low-frequency ripple power. The buck-type APF operates independently from the main circuit power devices, comparing to the coupled-type APF. The proposed MPC compensates the low-frequency ripple power directly by the APF capacitor...
This paper proposes a novel configuration of six phase IM to drive from a three phase stacked multilevel inverter. Apart from greater fault tolerance compared to three phase, a six phase machine enables the use of low voltage devices for the inverter. Also the inverter used here is a three phase nine level stacked inverter which itself uses low voltage devices. Thus MOSFETs can be used for the inverter...
In conventional photovoltaic microinverters configuration, a single PV module is connected to the grid through two converter stages: a step-up dc-dc stage and a step-down dc-ac stage. In the first stage, a high frequency transformer is generally used to achieve the high step-up voltage ratio conversion to a voltage above the grid peak value, reducing the converter efficiency while increasing its size...
In this paper a generalized formulation for Selective Harmonic Mitigation Pulse Amplitude Modulation (SHM-PAM) has been presented to control Cascaded H-bridge (CHB) inverter with non-equal DC sources. Consistent with the proposed SHM-PAM technique, switching angles are attained constant while the calculated magnitudes of DC sources vary linearly for all modulation indexes (ma). In fact, in the SHM-PAM,...
Current control method for single phase LCL grid connected inverters is presented. The controller is designed as a combination of feed-forward and sliding mode control. While feed-forward will play the main role in the steady state, the sliding mode controller will be active in case of parameters uncertainties and/or disturbances. The pulsed nature of the pulse width modulator is taken into account...
Solar energy is a promising alternative energy source for a sustainable pollution-free future. Due to the requirements of high efficiency, reliability, power density and low cost, transformerless PV inverters can be utilized in a grid-connected solar energy system. However, this suffers from no galvanic isolation and leakage currents through the stray capacitances between the PV array and the ground...
In-motion Wireless Power Transfer (IM-WPT) is the ability of charging the battery of an EV while it is in motion. This paper introduces a review of IM-WPT charging. The main issuses relatted to; the technology associated, infrastructure and current challenges faced in research and the market scenario are addressed along the paper.
Islanding detection methods have been proposed for inverter based distributed generation (DG) with grid connected capability only. Micro-grids are composed of DGs that are capable of operating in two modes: grid connected and islanded. This paper introduces and proposes the concept of micro-grid transition detection where the status of the micro-grid is detected based on adaptively modifying the droop...
The work presented in this paper describes an improvement of a P-V optimal slope MPPT technique. To achieve this improvement, all the degrees of freedom of the inverter control are exploited. Two forms are then established. Modeling and design of a PV power plant using these improved forms are performed. The results are validated by simulation in the Matlab-Simulink environment.
Considering the ongoing paradigm shift of large scale solar plants from central inverters to multistring inverters, new associated logistic requirements have highlighted the need to lower the weight of power converters without compromising efficiency and reliability. To meet this need, Silicon carbide based semiconductors are considered an enabling technology as they allow weight reduction in power...
This paper discusses the design and topology of the indirect matrix converter. The double space vector modulation technique (DSVPWM) is applied on the system and a unity power factor was accomplished along with desired sinusoidal input and output waveforms. The whole system is simulated using Matlab/Simulink, and the results prove to comply with the existing power quality standards.
Hybridization of the homogeneous battery-only energy storage system (ESS) with supercapacitor (SC) has proved to be an effective solution for extending the battery lifetime and increasing the power capability of the ESS [1, 2]. However, the addition of the SC and associated DC/DC converter will increase the system weight and cost, thus nullifying the monetary gain resulting from the extension of battery...
In this paper, a new multilevel inverter topology which can be operated in both symmetrical and asymmetrical configurations has been proposed. In order to produce all steps of voltage at output, four different algorithms are proposed to find the value of DC sources. The proposed topology reduce switch count, gate driver circuits, total voltage blocking capability and isolated DC voltage sources which...
The impedance source inverter family has become one of the most interesting alternatives for wind and photo-voltaic energies applications which require high conversion ratio. The main drawback of these inverters is related to the modulation signal which must be used to control the output current and voltage conversion ratio simultaneously. To deal with this problem several modulation techniques and...
In this paper, a three-phase five level inverter with new balancing algorithm is proposed using Selective Harmonics Elimination PWM. The inverter is fed photovoltaic generator as dc source. 36 redundant vectors are making use for the 12 unbalance cases of four capacitor voltages instead of 24 cases presented in the previous works. The obtained results show that the frequency of the PWM is unchanged.
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