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This paper presents the design of two different kinds of passive filters (L and LCL filters) for a grid-connected cascaded H-bridge multilevel inverter and the classical two level inverter for battery energy storage systems. Two design methods are proposed. The first method is based on the allowed current ripple in the filter's inductor while the second method is based on an iterative design algorithm...
This paper presents a new soft-switching technique for the current-fed full-bridge DC-DC converter that enables zero voltage switching of the input side inverter switches. To achieve this, the secondary side voltage doubler rectifier has to be realized with active switches. Two control channels synchronous with the control signals of the inverter switches are added for driving those switches. Zero...
This paper presents a cooperating converter that interfaces a Low-Voltage Energy Storage System with the electrical grid. In this paper, Low-Voltage is consider a voltage that is much lower than the minimum DC voltage required for controlling properly the current of the grid connected inverter. Energy Storage Systems operating at Low-Voltage usually require in conventional applications the inclusion...
In this paper, a new soft switching T-type three level inverter is proposed. The proposed new converter provides for main switches to turn on with Zero Voltage Transition (ZVT) and turn off with Zero Voltage Switching (ZVS) without any voltage or current stresses. Also, the proposed new converter provides Soft Switching (SS) for all semiconductors. Besides, Electro Magnetic Interference (EMI) noises...
This paper describes a novel rotor position estimation method for IPMSM at low speed without any signal injection. The basic idea of proposed method is using derivative currents in zero vector state, because the derivative currents include the rotor position information. This paper presents the relationship between rotor position and current response at zero vector mathematically. By this relationship,...
This paper presents an ozone-generation system with modular expansion and two-terminal driving mechanism to improve the ozone-generating performance. This study is concerned because the high AC voltage is often utilized to excite the ozone ceramic chip and a high withstand voltage are required for components, possibly causing a larger complexity of circuit design. This paper, therefore, suggests a...
This paper will present the modelling, analysis and design of a load-independent Class EF inverter. This inverter is able to maintain zero-voltage switching (ZVS) operation and produce a constant output current for any load value without the need for tuning or replacement of components. The load-independent feature of this inverter is beneficial when used as the primary coil driver in multi-megahertz...
This paper presents a new power semiconductor IGBT module family dedicated for Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) power-train inverter applications, especially for higher power requirements. The new IGBT module family adopts a 6-in-1 circuit configuration with an optimized internal layout, Direct Lead Bond (DLB) structure and an integrated Al fin for direct liquid cooling. As...
Grid-connected inverters (GCIs) are power electronics interfaces to connect distributed energy resources into the grid. In order to improve the performance of distributed energy resources as well as maintain the high power quality of the grid, it is important to understand the characteristic of GCIs with appropriate controllers depending on its applications. This paper presents a study on the effect...
In a DC-AC system, some problems may threaten the reliability of the whole system, such as the shoot through issue and the failure of reverse recovery. Some methods are proposed to improve the reliability of the converters. The dual buck inverters can solve the above problems without adding dead time but the dual buck topology has a main drawback of low magnetic utilization which increases the volume...
In this paper analytical study have been undertaken to relate the operating frequency of the inverter in inductive power transfer system used to charge the electrical vehicle that is free to move. The distance varies the mutual inductance of the pickup coil and the resonance frequency of Inductive Power Transfer system. The study also shows the maximum power transfer is achieved by the appropriate...
This paper investigates the performance of a magnetically coupled T-Source-Inverter (TSI) for extra low voltage and high current applications. As the TSI is part of the well-known group of inverters with impedance source networks, it is capable to boost the output voltage beyond the level of the input voltage within a single stage. This boost operation is achieved by inserting a new operational state...
This paper proposes a novel automatic mode transition control strategy for multiple inverters to operate in grid-connected and islanded modes without communication. When grid is available, all the inverters operate in grid-tied current control mode and transfer available power to the grid. On grid failure, they automatically shift to conventional droop control mode and shift back to grid-tied current...
An efficient single-phase grid-connected voltage source inverter (VSI) topology by using the proposed Active Virtual Ground (AVG) technique is presented. With AVG, the conventional output L filter can be reconfigured to LCL structure without adding additional inductor. High frequency differential mode (DM) current ripple can be significantly suppressed comparing to the prior single-phase grid-connected...
In an inversion system, high reliability is one of the main targets pursuing. Some problems will threaten the reliability of the system, such as the shoot through issue and the failure of reverse recovery. The dual buck inverters can solve the above problems without adding dead time but the low magnetic utilization increases the volume and weight of the system. This paper firstly reviews the traditional...
This paper examines the quasi-Z-source series resonant DC/DC converter as a candidate topology for the PV module integrated converter (MIC) with an extended input voltage regulation range. The converter features multi-mode operation by combining the shoot-through pulse-width modulation and ordinary phase-shift modulation to realize the boost and buck operating modes, respectively. Our experiments...
A 25 kW wireless charger design for electric vehicles is presented in this paper. The wireless charger consist of three phase power factor corrector (PFC), three phase resonant inverter, primary and secondary coils with series resonant compensation, and a rectifier. In the proposed design, PFC provides a constant voltage DC Bus and the whole output regulation is done by the resonant inverter. It simplifies...
The iron losses of three-phase inductor used in a three-phase pulse-width modulation (PWM) inverter are evaluated. First we clarify three-phase inductor design in order to make same inductance value between the each phase. Then based on the design, iron losses for various structure of inductor are simulated. Simulation result shows the iron loss can be reduced about 5% by changing structure from conventional...
This paper investigates the performance of Slip mode frequency shift (SMS) islanding detection method (IDM) in the presence of different inverter interface control strategies (IICS). The Impact of the two constant-current and constant-power IICS when the inverters are equipped with SMS-IDM, are compared and analyzed from detecting islanding point of view. This study is based on time-domain simulations...
The major drawback of the two switch flyback topology is its low-power applications such as microinverter. This study proposes a high-power two-switch flyback inverter and shows its excellent performance as a string-type PV inverter. The suggested inverter system is based on interleaving technique and operated in discontinuous conduction mode. Moreover, a fast and robust maximum power point tracking...
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