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This paper presents a new capacitively-aided zero voltage switching (ZVS) technique for isolated bus converters. The proposed technique helps to achieve ZVS conditions for both inverter and rectifier switches with the aid of magnetizing current of the transformer and capacitors interconnecting primary and secondary side switching nodes. With the proposed topology, the ZVS conditions for inverter and...
A complete control system of smart microgrid is proposed in this paper, in order to realize the smooth mode transfer of the grid-connected mode (GTM) and islanding mode (ILM). In the system, every DG unit will work as the voltage source and use the same control method of output voltage, whatever in GTM or ILM. The only difference of GTM and ILM is how to regulate of the reference voltage of the voltage...
This paper describes a theoretical and experimental study on a seamless transfer control strategy for the parallel operation of three-phase voltage source inverters (VSIs) for energy storage systems (ESSs). Moreover, phase-locked loop, seamless transfer control, and parallel control algorithm are optimized for simplicity in order to implement in a unified-controller. Finally, the proposed algorithm...
Recently, high speed motor drive is widely studied thanks to its advantages such as high reliability and power density. In these applications, the ratio of switching to operating frequency, Fratio, becomes very low due to the limitation of the switching frequency of switching devices. Such a low Fratio drive is also discussed in traction and high power applications due to the efficiency issue. Among...
This paper proposes synchronization strategies for cascaded H-Bridge multi level inverter (CHBMLI) topologies with carrier based sinusoidal pulse width modulation (PWM) techniques. It is presented how synchronous carriers are generated in desired phase and frequency from the instantaneous voltage references to maintain 3-Φ, half wave and quarter wave symmetries among inverter pole voltage outputs...
In this paper, design and implementation of a sinusoidal flux controller has been proposed for a core loss tester for eliminating the higher order harmonics from the flux passing through the core. The core loss test is performed with a toroidal transformer that consists of a main and sense windings wound on a toroidal core. The flux through the core is calculated with the numerical integration of...
Deadbeat-direct torque and flux control (DB-DTFC) has been emerged as a high performance digital control law for induction machines and permanent magnet machines. Its key attributes are excellent dynamic performance, the use of only one single control law over a wide torque/speed range and direct applicability to overmodulation strategies. This paper extends prior research by presenting the implementation...
Adjustable Speed Drives (ASDs) based on double-stage conversion systems may inject interharmonics distortion into the grid, other than the well-known characteristic harmonic components. The problems created by interharmonics make it necessary to find their precise sources, and, to adopt an appropriate strategy for minimizing their effects. This paper investigates the ASD s input current interharmonic...
With a still increase of grid-connected Photovoltaic (PV) systems, challenges have been imposed on the grid due to the continuous injection of a large amount of fluctuating PV power, like overloading the grid infrastructure (e.g., transformers) during peak power production periods. Hence, advanced active power control methods are required. As a cost-effective solution to avoid overloading, a Constant...
This paper presents an active islanding detection method which has zero non-detection zone. This method is the advanced version of the conventional slip mode frequency shift islanding detection method (SMS IDM). In this method the parameters of SMS IDM change based on the local load impedance value. The parameters value are calibrated periodically by measuring the impedance of the local load. The...
In PV strings, a number of PV modules are connected in series where the same current passes over all of them. To allow the maximum power points of the PV modules to be tracked individually, DC/DC converter known as optimizers could be used to interface each PV module with string. Processing the entire PV power by the optimizers increases the cost and degrades the system efficiency. In this paper,...
Leakage current reduction is one of the important issues for the transformelress PV systems. In this paper, the transformerless single-phase cascaded H-bridge PV inverter is investigated. The common mode model for the cascaded H4 inverter is analyzed. And the reason why the conventional cascade H4 inverter fails to reduce the leakage current is clarified. In order to solve the problem, a new cascaded...
In high power conversion, low device switching frequency operation is preferred in order to satisfy the thermal constraints of the semiconductor devices and also to improve efficiency. However, low device switching frequency operation leads to higher total harmonic distortion (THD) of the converter output currents. Synchronous optimal pulse-width modulation (SOP) technique is an emerging low device...
The transformerless inverters have the advantages of low cost and high efficiency, which attract more attentions in the field of photovoltaic (PV) power generation system. However, the transformerless grid connected system has the main challenge for keeping low leakage current due to the non-isolation configuration. To better attenuate the leakage current in single-phase system, a few of neutral point...
This paper presents an inverter topology, which aims to connect several DC sources to the same AC output using a single stage of conversion. This topology has been given the name of multi-source inverter. This concept has been developed for applications such as hybrid electric powertrains. Specifically, this topology allows different DC-link voltages to drive a traction motor using the battery voltage...
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...
Digital high-frequency arc welding inverter is widely used in welding areas because of its many advantages such as high efficiency, small size, easy to control etc. However, with the development of high frequency of the switching, the conducted EMI generated by arc welding inverter becomes increasingly serious, especially common mode conducted EMI. Based on Digital Active EMI Filter (DAEF) controller,...
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...
Measuring the load current of drive inverters is still inevitable for a precise current control. In common industrial and automotive inverters hall effect based current sensors are widely used. [1] The presented novel current measurement method is based on an inductive current sensor like a Rogowski coil. This can be fabricated much smaller and cheaper than hall based current sensors and can be integrated...
Silicon Carbide as an emerging technology offers potential benefits compared to the currently used Silicon. One of these advantages is higher efficiency. If this is targeted, reducing the on-state losses is a possibility to achieve it. Parallel-connecting devices decrease the on-state resistance and therefore reducing the losses. Furthermore, increasing the amount of components introduces an undesired...
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