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This paper presents a new structure based on a line-commutated inverter (LCI) for photovoltaic (PV) applications. The proposed LCI circuit is able to inject the DC power to the grid at the unity power factor and with reduced harmonic levels. The proposed circuit with voltage-based maximum power point tracking (MPPT) is implemented in grid-connected PV system. The experimental results show that proposed...
In this study, the authors aim to develop the interconnection inverter called “Proton” used for the “Digital Grid” which has been proposed as a new electric power grid. The authors propose an islanding detection function and fault ride thorough (FRT) function of interconnection inverter. In the proposed method, the output current is controlled to be proportional to the voltage of the grid. During...
This paper describes influence real semiconductor devices, commutation strategies, modulation period selection and switch on resp. switch off times on output voltage of matrix converter. Methods for decreasing of the influence are mentioned in the paper too.
Considering the effect of current and voltage frequency content in the power-hardware-in-loop (PHIL) simulation of water electrolyzers is studied as the AC components may cause additional losses in the electrolyzer stack. A transistor based power supply is used to excite DC current with selected AC components for an alkaline electrolyzer and a PHIL simulator. The practical current and voltage waveforms...
Many household appliances today are equipped with inverter technology which may generate disturbances in the frequency range within 9–150 kHz related to the frequency switching used. Since the regulations covering the disturbance in this frequency range are not applicable for all household appliances, the efforts to limit the disturbance produced by some household appliances are less. The voltage...
Nowadays, the inverter technology is widely used in household appliances. This technology may generate disturbance in the frequency range within 9–150 kHz due to its frequency switching. In the shared low voltage network, many appliances can be connected and operated simultaneously causing the interaction between appliances. The disturbance produced by appliance may influence the working performance...
This paper presents the analysis of an AC-AC converter used in partial discharge test. In this paper, the analysis of the frequency converter is separated into two parts. Firstly, the converter models are simulated by a circuit simulation program for comparing noise signals generated by the 2-level SFC and 5-level SFC. The frequency of the converter was set to be 200 Hz. With the help of the simulator,...
The current energy constraints are pushing researchers to design and optimize power electronic devices for integrating and consuming renewable energy more efficiently. In this paper, a voltage sensorless Model Predictive Control (MPC) solution is proposed for the grid integration of a Packed U Cells (PUC) based PV system. The studied topology is a grid-connected 4-cell 15-level PUC inverter. The control...
To improve the power durability of interdigital transducer (IDT) electrodes, transversal type of surface acoustic wave (SAW) filters based on a SiO2/Al/LiNbO3 structure were fabricated and their power durability, withstand voltage, and frequency temperature characteristics were measured. We have proposed a gate drive system using the SAW filters for the multilevel invertor. In our system, a transmission...
This contribution investigates behavioral MOSFET models used for the simulation of conducted and radiated electromagnetic interferences (EMI) of an automotive inverter. A combined simulation of an equivalent circuit and the 3D geometry for a traction inverter based on 1.2 kV, 40 A SiC MOSFETs is presented. The model considers the MOSFET as a combination of parasitic elements of the package, voltage-dependent...
This paper is the first part of a three-part consecutive series regarding the design of a new portable photovoltaic (PV) generation system used for teaching the energy conversion process of a real PV system. This design is to comply with a national effort known as the SunShot initiative which aims to leverage the awareness of renewable resources, particularly PV generation systems. The experimental...
The emergence of clusters of rooftop Photovoltaic (PV) systems in Distribution Networks (DNs) might result into voltage rise that can exceed the voltage limits particularly in secondary systems. This paper assesses the performance of two smart inverter controllers (Volt-Watt and Volt-Var) to mitigate these technical problems. A large-scale DN fully modeled in OpenDSS is used in the assessment considering...
Recently, a formalized approach was derived to construct common-mode equivalent circuit models (CEMs) of complex power systems. In this paper, an initial focus is on the validation of the approach using Purdue's reduced-scale naval dc microgrid (PDCM). As part of the validation, techniques to characterize the measured and simulated CM performance in the frequency domain are highlighted. Subsequently,...
This paper proposes a generalized logic-based method for fault diagnosis in multilevel inverters that can be integrated with reconfiguration methods. Thus, both effective fault diagnosis and fault tolerance can be accomplished. To validate such integration, the proposed fault diagnosis method is applied to a five-level neutral point clamped inverter with three reconfiguration methods proposed in the...
This paper presents the results of an experimental investigation on the harmful effects due to the PWM inverter supply on low voltage induction motors. Laboratory tests have verified on two different models of motors the reflected wave phenomenon, which induces on their terminals a rising voltage edge with peaks higher than twice the DC link voltage; further tests in a qualified firm have revealed...
This paper presents a symmetrical hybrid nine-level inverter with reduced voltage sensors. A capacitor voltage estimation method is proposed based on phase-shifted PWM by only measuring the total DC-link voltage and the multilevel phase voltage. Under certain conditions, a modified algorithm to further reduce the number of voltage sensors is given. Simulation results are presented to demonstrate these...
The hybrid AC/DC microgrid structure is considered to be the future trend of power systems, due to the vital necessity of connecting more renewable energy sources and storage elements to supply modern AC and DC loads. This paper proposes a power sharing and control strategy for hybrid AC/DC microgrids using the droop control technique. A new structure of the hybrid microgrid is suggested by connecting...
Wind power has an important place in renewable energy systems. Therefore, it is vital to make use of wind power systems by obtaining maximum efficiency. The energy produced by the wind power systems shows variance depending on the speed and direction of wind and in some cases the wind power may not be at the expected level for the on grid micro inverter. This study aims to increase energy sustainability...
A sliding-mode model reference adaptive (MRA) observer-based model predictive current control (MPCC) strategy is developed for permanent magnet synchronous motor (PMSM) drive systems with DC-link voltage sensorless. Generally a DC-link voltage sensor is indispensable for PMSM drive fed by voltage source inverter (VSI) to implement MPCC. In response to DC-link voltage sensor fault, by combination of...
We are considering the problem of controlling a single-phase Multicellular inverter with LC output filter. The control objectives are: (i) generating a sinusoidal voltage with amplitude and industrial frequency fixed by the reference signal, (ii) ensuring a good convergence of the voltages across the flying capacitors. The controller is designed using the backstepping approach in its adaptive versions...
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