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Electricity in remote communities is usually provided by diesel power plants at relatively high costs. This issue can be addressed with the addition of renewable energy sources such as wind and PV. However, due to the intermittent and fluctuating characteristics of the power produced by these sources, the dispatch of the diesel gensets for operation with variable (droop-based) frequency, high efficiency...
This paper presents a soft-switching (ZVS) boost converter integrated in such a way to obtain, in a single conversion stage, the maximum energy extraction from photovoltaic panels, battery charging and discharging dynamic control, and high voltage step-up to the inverter DC bus, also operating with soft-switching capability. In order to verify its effectiveness, experimental results from this converter...
Vehicle to grid (V2G) power transfer has been under research for more than a decade because of the large energy reserve of an electric vehicle battery and the potential of thousands of these connected to the grid. In this study a complete analysis of the front end inverter of a non-isolated bidirectional EV/PHEV charger capable of V2G reactive power compensation is presented.
This paper presents a new hybrid cascaded H-bridge multilevel inverter (HCMLI) motor drive DTC control scheme for electric vehicles or hybrid electric vehicles where each phase of the inverter can be implemented using only a single DC source. Traditionally, each phase of the inverter require n DC source for 2n + 1 output voltage levels. In this paper, a scheme is proposed that allows the use of a...
A novel multilevel inverter with a small number of switching devices is proposed. It consists of an H-bridge and an inverter which outputs multilevel voltage by switching the dc voltage sources in series and in parallel. The proposed inverter can output more numbers of voltage levels in the same number of switching devices by using this conversion. The number of gate driving circuits is reduced, which...
This paper discusses a novel high-efficiency interleaving push-pull converter with very low input voltage and high output voltage. Such push-pull converter should be used as high capacity battery discharger, and has the capability to feedback the discharging energy to the grid if it is cascaded with an inverter. The main characteristics of such push-pull converter are high voltage turns ratio, all...
Contactless power transmission system with the advantages of safety and convenience has been applied to daily supplies. However, general contactless power transmission charger cannot control the current cause there is no charge controller in secondary side and the severe limitation between primary and secondary sides of the battery charger cause difficulty to design. This study provides the charge...
The dual-active-bridge (DAB) and a half-bridge inverter are integrated back-to-back for a converter/inverter system. The power source is isolated by a high frequency transformer, and a 60 Hz inverter is directly connected to the secondary side of the converter via DC link capacitors. Thus, the proposed converter-inverter topology greatly reduces the size and the number of parts count, while providing...
In this paper a dynamic voltage restorer (DVR) circuit with a bi-directional power electronic transformer (PET) structure is proposed to correct input utility voltage distortions on a sensitive load. This DVR-PET contains full-bridge DC-link inverter (FBDCI), high frequency isolating transformer (HFIT), cyclo-converter and output filter. A phase shift modulation (PSM) control scheme is used to regulate...
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
Z-Source inverter is a single-stage power converter capable of either stepping down or stepping up the input dc voltage while converting it to ac form. However, due to the presence of a diode in series with the input source, the power flow is limited to one direction, i.e. from the dc source to the ac side. However, for some energy storage applications such as ultracapacitor banks, battery banks etc...
A multistage power conversion scheme, capable of providing a regulated power supply despite disturbances in the source voltage or changes in the output load, is proposed. The high frequency power conversion system also provides compensation for acute voltage sags/swells and a faster transient response by employing appropriately controlled power electronics converters. Through the utilization of a...
This study examines the feasibility of increasing a smoothing capacitor of battery system regarding a high power supply in a short period during the transition to isolated operation of distributed generation (DG). By forming a small-scale facility micro-grid (FMG), DG and battery system can be utilized to protect a part of load against a disturbance of utility grid. For damping the power oscillation...
Due to always increasing commutation speed, parasitic parameters such as interconnection inductances and stray capacitors are directly linked to voltage surge, resonance and electromagnetic interference. To guide the selection of power components, assess low-inductive film capacitors and laminated bus bar, and in the end realize the high power density and high reliability for electrical vehicle inverters,...
In electric vehicle (EV) drive voltage source inverter (VSI), DC-link capacitor can be primarily designed on RMS current value and its capacitance can be selected small values cause of bulky equivalent capacitor in battery. An advanced film capacitor is adopted to replace the conventional electrolytic bulk capacitors. This paper describes the PSpice model of VSI with major parasitic parameters and...
A novel bi-directional buck-boost converter used for battery charging and discharging cooperated with a three-level half bridge inverter in a UPS is proposed. The operation of charging and discharging can be controlled respectively, and the capacitor voltage balance can be achieved based on the peak current control. The operating principle and parameter design of the converter are analyzed in detail...
The present paper proposes a series capacitive decoupling for an innovative universal power conditioner. Preliminarily a comparison with series inductive configuration is discussed. Control strategy is then proposed. The series capacitive configuration allows the same basic characteristics of the other one, obtaining the same dynamic performances and reference tracking precision. Moreover the decoupling...
This paper proposes a dynamic voltage restorer for low or medium power applications with a single phase inverter (or STATCOM to acts as a series active filter) structure to compensate the line voltage unbalancing and distortions on the three phase load. The number of required switches of the conventional series three phase circuits is reduced from six to four. A new and simple control routine is applied...
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