The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A DC-AC power inverter contains parasitic inductances in a DC-linked wire and a load wire. These parasitic components may cause oscillation in the output voltage of the inverter, and cause electromagnetic interference (EMI) issues to other power electronic circuits in the system. In this paper, an effect of the parasitic inductances on the DC-linked wire and load wire of the power inverter are analyzed...
This paper based on the commutation mechanism of series capacitor commutated converter (CCC), the CCC is applied to UHVDC transmission system, and the mathematical model of reactive power demand of CCC inverter is established. According to the actual parameters of Jiuquan-Hunan ±800 kV UHVDC transmission project, the simulation model of CCC- UHVDC system is built by PSCAD/EMTDC simulation software...
Electric drives of high power applications require power electronic converters of high power rating. To meet this requirement, the multilevel inverter concept has been introduced for medium voltage and high power applications. The multilevel inverter became popular because of its advantages like low harmonic distortion, less rate of change of voltage (dv/dt) and it reduces the bearings stress of a...
Virtual oscillator control (VOC) and droop control are distinct methods to ensure synchronization and power sharing of parallel inverters in islanded systems. VOC is a control strategy where the dynamics of a nonlinear oscillator are used to derive control states to modulate the switch terminals of an inverter. Since VOC is a time-domain controller that reacts to instantaneous measurements with no...
This paper presents multicarrier Phase Disposition PWM (PDPWM) technique with elliptical wave as reference wave for Cascaded Multilevel Inverter (CMLI). The proposed control strategy has been implemented using Xilinx System Generator (XSG) to reduce the complexity of the implementation. The XSG directly synthesis the block sets and generated the HDL code for the target FPGA board. This paper uses...
Due to the inherently distributed and heterogeneous nature of the microgrids, distributed control can be a promising approach to improving the stability, reliability and scalability of the microgrids compared with centralized control strategies. This work studies the distributed reactive power sharing problem for a microgrid with connected AC inverters. Under the lossless assumption of the microgrid,...
This paper presents a compact RF power inverter implemented with a PCB multi-resonant input filter for driving an electrothermal plasma micro-thruster, mini Pocket Rocket 3.0 (miniPR 3.0). This miniPR 3.0 and its driving electronics are part of an investigation seeking to add micro propulsion systems to low cost CubeSats. The proposed RF power inverter and multi-resonant input filter use only air...
A filter-based control scheme is developed for buck-type converters. This approach relies only on a single output voltage measurement. The benefits of this approach are reducing the system cost as well as measurement noise and disturbance injected by output current and/or inductor current measurements. A Lyapunov stability analysis is utilized to demonstrate system stability. Experimental results...
This paper presents a novel low-cost photovoltaic (PV) microinverter with an ultra-wide MPPT voltage range. This approach is based on the two-stage energy conversion where the front-end boost half-bridge DC-DC converter is used to step up the fluctuating PV voltage to a stabilized high DC voltage, which is next transformed to a grid compliant AC voltage by the grid-tied inverter. The operation principle...
Offshore wind farms using medium voltage DC power collection promise an increase in efficiency and a reduced bill-of-material cost. One of the key components is the high power, medium voltage DC/DC converter located in the wind turbines. There are many suggested topologies in the state of the art, but they are all still at an immature technology level, as no substantial experience from full-scale...
In this paper, the use of Power Hardware-in-the-Loop (PHIL) is presented for analyzing, testing, and characterizing a commercial single-phase grid-tied PV micro-inverter in a laboratory environment. The PHIL set-up used is composed of a real-time system (RTS), device (micro-inverter) under test (DUT), four-quadrant amplifiers for grid simulation, solar array simulator (SAS), and data acquisition hardware...
This paper presents a simple method for calculating the efficiency map of a Permanent Magnet Synchronous Machine (PMSM) for traction applications. The calculation uses motor nameplate data only. This is useful in e.g. design phase of an electric vehicle where the efficiency map is required to estimate the range based on a given driving cycle. The method is experimentally validated with a 100kW, 191...
The paper describes a fully-dispatchable microgrid architecture that features i) the adoption of a master/slave power-based control in the central dispatcher to drive distributed power generators and ii) the connection of a suitable power converter equipped with energy storage, called Utility Interface, at the point of common coupling with the mains. Property i) ensures scalability and capability...
This study proposes an enhanced current control strategy to eliminate DC and harmonic current at the output current of three-phase grid-connected inverters caused by DC offset and scaling error in grid voltage measurement. The proposed current controller designed in the stationary (α-β) reference frame is developed with a proportional integral (PI) plus three resonant controllers where the resonant...
A complete test for conducted EMI from the direct current fed (DC-fed) alternating current (AC) motor drive system in an electric vehicle (EV) under load conditions is set up to analyze the conducted voltage and current of high voltage DC cables in a frequency range of 150 kHz–108 MHz at 500rpm and 2500rpm with 50Nm load torque of the EV motor with space vector pulse width-modulation (SVPWM) control...
This paper describes a concept for the coordination of active applications in LV networks to avoid unacceptable voltages and to ensure a stable control operation. The concept has been kept simple, without using an extensive algorithm. This ensures an uncomplicated implementation and operation. The focus of the paper lies on the explanation of the algorithm and the practical implementation. Furthermore,...
Nowadays, there is a great interest on new magnetic materials and their outstanding properties of low iron losses. However, when a magnetic material is experimentally characterized, it is important to select a suitable sampling frequency specially when the inverter is driven at a high carrier frequency. Nevertheless, iron losses of a magnetic material under inverter excitation are usually underestimated...
In order to simplify the configuration of photovoltaic (PV) grid-connection system, this paper proposes to adopt a buck-boost dc-dc converter, and then develops a single-phase inverter via the connection with an H-bridge unfolding circuit with line-commutated. Depending on the conditions of dc input-voltage and ac output-voltage, the proposed circuit can work functionally as either a step-down or...
The paper presents aspects related to the connection of renewable sources of energy to the grid and focuses on the Photo Voltaic Power Plant (PVPP). The correlation of this process with Power Quality (PQ) issues and conditions for certification of each plant in accordance with regulations are included in our work as well. Results of measurements of PQ in the Points of Common Coupling (PCC) in the...
As the penetration level of grid-connected Photovoltaic (PV) systems increases, the power quality is one of the major concerns for system operators and the demands are becoming even stricter. The impact of interharmonics on the grid has been acknowledged in recent research when considering a large-scale adoption of PV inverters. However, the origins of interharmonics remain unclear. Thus, this paper...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.