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.
In order to research the conducted EMI modeling of the inverter circuit, in this paper the high frequency models of power semiconductor devices, passive components, and extractions of parasitic parameters of passive components, printed circuit board (PCB) are presented. The simulation model of conducted EMI of the inverter circuit is proposed by using the Saber software and its simulation waveform...
With the development of electrical control technology and the need of environmental protection, the marine shaft generating system based on PWM technology is developed and used. In shaft generator system, inverters parallel and parallel of inverter and diesel generator are key problems. Therefore, the paper proposes a control strategy based on virtual synchronous generator theory that simulates the...
The technology of microgrid has been developed by the progress of new energy technology, the new energy connected to the microgrid by (distributed generator) DG. Microgrid represents the new direction of the power grid as the great complements of traditional power supply network. This paper presents that using several photovoltaic grid-connected inverters as the DG, and control the microgrid by controlling...
Induction motor (IM) is the workhorse of the industries. Amongst various speed control schemes for IM, variable-voltage variable-frequency (VVVF) is popularly used. Inverters are broadly used to produce variable/controlled frequency and variable/controlled output voltage for various applications like ac machine drives, switched mode power supply (SMPS), uninterruptible power supplies (UPS), etc. This...
In this paper, four symmetrical switching patterns for high-frequency three-phase quasi-Z-source inverters are proposed. Each pattern results in different values of currents during semiconductor switching processes. Therefore, an adaptive pulse width modulator is introduced to perform operation at minimum switching losses, related especially to shoot-through states. On the other hand, changes in pulse...
A device-based health conditions monitoring and diagnosis method for inverters is present. In the inverter, SiCGTO (Gate-Turn-Off Thyristor) is considered as the key device to achieve pulse-width modulation. So the performance degradation of SiC-GTO device induced by interface-states is critical for the health conditions of inverters. In the research, key electrical parameters, including the forward...
We developed a gate driver IC that can power IGBTs of up to 500 amperes for HEVs and EVs. A newly developed Zener clamping circuit effectively suppressed the IGBT spike voltage in short circuit (SC) mode. The silicon-on-insulator (SOI) process was utilized to achieve high temperature operation and high surge protection.
This paper proposes a novel highly reliable single-stage buck-boost inverter. It can be operated as grid-connected and stand-alone inverter. In a single-stage, it can generate an output ac voltage higher and lower than the input dc voltage. The proposed inverter can be employed in grid-connected single-phase PV systems without injecting large dc current into the grid. In addition, it has no shoot-through...
An input/output characteristics of the inverter composed of the DNA/Si-MOSFET and the parasitic capacity was studied. The DNA was bridged between the Si electrodes those serve as the source and drain with the 120nm-gap-length. At VDD=0V and VDD=3V, the output characteristic was almost the same. The reason of this phenomenon is that the space charge layer of the DNA/Si-MOSFET changes due to the charge...
The inverter with critical loads should be able to provide critical loads with a stable and seamless voltage during control mode change as well as clearing time. The indirect current control has been proposed for providing stable voltage with critical load during clearing time and seamless control mode transfer of inverters. However, the islanding detection is difficult since with the indirect current...
High proliferation of Inverter Interfaced Distributed Energy Resources (IIDERs) into the electric distribution grid results in failure of the traditional overcurrent based fault detection at the point of interconnection (POI) of IIDERs. This paper focuses on other strategies of detection, namely, 1) using the transient content at the inverter output, 2) using zero sequence current magnitude at the...
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...
The microgrid can operate in grid-connected mode and islanded mode, and the parallel operation of inverters will be involved in both modes. However, due to the differences of output characteristic among various inverters, the load power can't be shared equally. As a result, some methods without communication lines such as droop control and VSG (virtual synchronous generator) control have been proposed...
In this study, a mode transition scheme between a single phase half bridge 2-level voltage source converter (VSC) and a 3-level T-type VSC is proposed. The efficiency of 3-level T-type VSC can be increased by the mode transition scheme. The mode transition scheme select the efficient operation method between a 2-level and 3-level VSC. The 2-level VSC or 3-level VSC operation method are selected depending...
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...
In this paper we examine a new architecture for the inverter used in the conversion of electric energy produced from sources of renewable energy. This type of inverter is particular because the compensation of current with double frequency is performed by a special block. In this block, like in the inverter, the switching of electronic keys is realized using the Triangular Current Mode method, which...
A zero-voltage switching (ZVS) pulse-width-modulation (PWM) single-phase inverter using a ZVS transformer-isolated step-up/down dc link is presented in this paper. The proposed ZVS transformer-isolated step-up/down dc link not only makes the switches in single-phase inverter can operate at ZVS condition, but it has a step-up/down input voltage function and it provides an isolation function. Moreover,...
Based on the fact that both the phase and amplitude characteristics of fractional capacitor are related to its order, the introduction of fractional capacitor will make power factor correction (PFC) more flexible compared with the one using conventional capacitor. In order to verify the PFC function with fractional capacitor, an equivalent fractional capacitor model composed of an inverter and a resistor...
In Jordan, electrical power demands trend is continuously increasing in the following decade. In 2030, the peak load is expected to achieve 7375 MW, which is 2.12 times higher than the power demands in 2016. Utilization of fuel local resources especially oil shale and renewable energy resources helps in securing the needs of the Jordanian power system to the generation capacity. Renewable energy is...
A novel solution of a single-stage buck-boost inverter with unfolding circuit at the output stage is presented. The inverter has a wide range of input voltage regulation, minimum passive components and a very flexible control structure. It can be applied for renewable energy systems where high power density is required. Our simulation results confirmed all theoretical statements.
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.