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An analysis of Hybrid Excitation Synchronous Generator (HESG) topologies for a direct drive wind turbine is investigated. Through an optimization process, the topologies of HESG are compared regarding the cost and the total losses. The optimizations are performed at the nominal on-load operating point of the generator. The trade-offs between each topology are analyzed according to a set of Pareto...
Cascaded H-Bridge (CHB) inverter is the most widely used topology for Medium Voltage (MV) drive system due to the high degree of modularity, easier implementation of medium output voltage, and ability to continuous operation under the cell fault condition. Because each power cell of CHB should have isolated DC source, multi-winding input transformer and three phase Active Front-End (AFE) are generally...
This paper introduces and generalizes a class of multilevel dynamic voltage restorer (DVR) for voltage sags/swells compensation of high-power sensitive loads. Such a device can improve the power quality of sensitive loads located in stiff systems. The proposed DVR is based on three-phase bridge converters series-connected by means of cascaded transformers using the concept of open-end winding (OEW)...
In the present paper, an iterative current injection based algorithm is presented for solving 2×25kV bi-voltage power systems with embedded autotransformers. This kind of systems are used for feeding most of the high-speed trains. The proposed methodology minimises the number of unknowns without simplifying the autotransformers model, conserving the original topology of the network. The system of...
The paper presents new topology for flyback converter which can be used for various applications. Generally in a flyback converter there is one primary winding and other secondary winding. But new topology deals with the introduction of tertiary winding which would create multiple outputs on secondary side. On one side there will be traditional DC output and on the other side there will be AC output...
This paper presents a novel inverter topology based on conventional Z-Source Inverter and Switched Capacitor DC-DC converter. Compare to other conventional topologies the proposed topology gives more boosting factor. Further the input current is continuous. In renewable energy conversion system, it is desirable to get high step up output voltage from a low input voltage source. The proposed topology...
For renewable energies power electronics is a key technology whereas much of the power conversion in the future grid or power plants is done using power electronic converters. By establishing cheaper and smaller solutions to solve the problems dealing with high power transmission the expansion of renewable energies can be advanced. As highly efficient actuators these converters have to be properly...
Open-end winding (OEW) three-phase drives with dual inverter configuration present high voltage gain, which is very valuable for electric vehicle (EV) applications. However, they can lead to zero-sequence currents and common mode voltages (CMV). A solution for the aforementioned problems is to control the inverters with only odd or even space vectors (SVs). Nonetheless, during dead-times the actual...
Focus is on a transformer based single-switch galvanically isolated quasi-Z-source converter. Single-switch topologies suit well for low power applications due to low complexity and cost of realization. However, their performance is rather limited, since only one switch should handle all converter power. Input-parallel output-series (IPOS) cascading improves stress of semiconductor devices, reliability,...
The Google Little Box Challenge, an open competition to build the world smallest 2 kW Photo-Voltaic (PV) inverter, triggered a trend in the power electronic community to design PV inverter systems with a very high power density. In particular, in this paper, a novel single-phase non-isolated PV inverter topology is presented, achieving both high efficiency and high power density. The proposed solution...
This paper presents controlled phase shifters (CPS) unified model (UM) for power grid modes calculation. Internal different topologies of CPS which affect the parameters of the UM are considered. Parameters of UM for various CPS topologies are calculated and analyzed. The influences of different topologies and control on transfer functions of CPS are investigated. The implementation of UM for calculation...
A new topology for an interleaved boost converter is presented in this paper. The circuit is able to provide high voltage gain without the need for using a large duty cycle. Analysis showing the effect of increasing inductor winding loss in relation to duty cycle is also presented. Losses in various components are considered and analysed. Finally, experimental results from a 200W prototype which was...
This paper presents a reduced-order generalized average model for a grid-connected High-Frequency-link micro-inverter for renewable energy sources applications; the grid-connected topology is based on the DC/DC Dual-Active-Bridge (DAB) converter without the intermediate DC-link. The switched model for the system is presented and from it the reduced-order generalized average model is obtained. Harmonic...
In recent years, driven by worldwide growing environmental awareness the research in power electronics was focusing on the development of highly efficient but mostly bulky converter systems e.g. for interfacing renewable energy to the grid. The GOOGLE Little Box Challenge was impulse to give the power density again more attention by motivating engineers worldwide to design a single-phase solar inverter...
Switched Reluctance Motor (SRM) drive can be operated with many types of converter configurations. Asymmetric converter which uses two switches and two freewheeling diodes per phase winding is used in all the applications. However some applications use different converter configurations. In this paper, two different converters used for energizing SRM machine are analyzed and their performances are...
Halbach array has been widely applied to improve the magnetic and force performance of tubular linear motors for its attractive features. Conventionally, the Halbach permanent magnet (PM) array is mounted inside the windings to be the mover. Herein, the other kind of structure in which Halbach array is mounted outside the windings also draws our interest. The magnetic and force performances of the...
The grid-connected systems employing Photovoltaic and fuel cells call for high step-up dc/dc topologies. Large voltage conversion ratio with ten times of voltage gain is essential for the front-end dc/dc converters. In this paper, the built-in transformer multiplier cell is inserted into each phase of the conventional interleaved boost converter. The multiplier cell is composed by the built-in transformer...
A virtual synchronous generator (VSG) control for high power permanent magnetic synchronous generators (PMSG) in wind power generation is investigated in this paper. A power factor correction (PFC) rectifier for each phase of the PMSG is designed to transform variable voltage and frequency of wind power into constant voltage DC power. The PFC boost inductor is replaced by a PMSG armature inductance...
This paper presents a reduced active switch count push-pull based DC fast charger for electric vehicles. The proposed system takes a 3-phase utility line voltage and produces a high frequency (HF) AC link employing only two active switches. A 5-limb HF transformer, in zig-zag connection, is employed for isolation. The primary side of the transformer is connected to a clamp circuit and two active semiconductor...
This paper introduces a new single-switch nonisolated dc-dc converter with very high voltage transfer ratio and reduced semiconductor voltage stress. The converter utilizes an integrated autotransformer and a coupled inductor on the same core to achieve a high step-up voltage gain without extreme duty cycle. Further, an integrated passive regenerative circuit recycles the leakage energy of the coupled...
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