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In this paper, analysis of single-stage ac/dc converter for small-scale wind power generation system is proposed. The harmonic currents of wind generator are reduced so as to decrease the wind turbine noise. The proposed three-phase wind converter has zero-voltage switch in the active switches. Compared with a traditional two-stage converter, high efficiency and high step-up voltage ratio are also...
In this research, a novel intelligent charger with battery diagnosis function is proposed. The diagnosis function is implemented by way of impedance spectroscopy achieved by controlling the charger to create a frequency swept excitation voltage at the battery terminals with no additional hardware. The impedance variation of battery according to the degradation over the life is measured and used for...
This paper presents a design of a digital direct power control strategy for a three-phase grid-connected inverter combining the discrete-time sliding mode control and the space vector modulation. Using the discrete-time state-space model of the controlled system, a discrete-time sliding mode control system is designed. Its output is a control vector which minimizes the instantaneous active and reactive...
The switch-mode operation of dc to ac inverters produces undesirable harmonics in the voltage and current outputs. Pulse Width Modulation (PWM) schemes based on Selective Harmonic Elimination (SHE) and carrier-based modulation are commonly used to address the harmonic reduction problem, and to provide adjustable inverter output fundamental components. The implementation of each scheme requires introduction...
With increasing demand for energy, there is a growing tendency to employ renewable sources such as wind energy. Using large amounts of energy from wind arouses critical issues such as voltage variation and poor quality power supply. Several papers have been published on suggestions to improve performance of wind turbines during grid fault; however, to the authors' knowledge only a few papers address...
Multiphase drives are now becoming serious competitor to traditional three-phase drives due to reasons of better fault tolerant property and reduced per-phase converter rating that are especially suited to high power drives application. One of the major factor of widespread research on multiphase drive are the availability of high computational power of control platforms such as DSP and FPGAs. With...
In this work, a proof of concept prototype for a photovoltaic array emulator based on a DC-DC Boost converter is presented. This design arises from the need to study in the laboratory new PV inverters based on Silicon Carbide (SiC) devices in order to evaluate their performances. The lack of space for installation of real photovoltaic panels and the high costs of the commercial emulators lead to alternative...
The repetitive controller is widely employed in grid-connected inverters to improve the power quality. Its resonant frequencies are predesigned to the nominal grid frequency and its harmonics to achieve excellent reference tracking and disturbance eliminating. However, the performance degrades when the grid frequency varies. In this paper, a frequency adaptive repetitive controller with a specially...
This paper presents the design of a novel integrated continuous current sensor (CCS) circuit for class-D audio amplifier and current mode controlled DC-DC converter. The proposed current sensor has the capability of sensing either positive or negative current of off-chip inductor continuously. Additionally, fast transient response with low quiescent current has been achieved. Furthermore, a calibration...
A high-frequency-link (HFL) micro inverter with a front-end diode clamped multi-level inverter and a grid-connected half-wave cycloconverter is proposed. The diode clamped multi-level inverter with an auxiliary capacitor is used to generate high-frequency (HF) three level quasi square-wave output and it is fed into a series resonant tank to obtain high frequency continuous sinusoidal current. The...
Three-phase four-wire Shunt Active Power Filters (SAPFs) can not only compensate the harmonics and reactive power for kinds of unbalanced nonlinear loads, but also suppress the neutral current. According to the disadvantages of conditional control strategies in dq0 frame for APF systems, a control strategy based on abc frame for three-phase four-wire SAPFs is presented. It achieves the control of...
This paper proposes a hybrid parallel three-level converter topology for large wind turbine generation (WTG) systems and its control method. The proposed topology focuses on a machine side of a back-to-back converter. It consists of one conventional three-level neutral-point clamp (NPC) converter and numerous reduced-part converters, which are connected in parallel depending on rated power of a WTG...
This work presents a study of the influence of different gate driver circuits on the switching behavior of SiC MOSFET devices used in a buck converter. The paper is based on several tests performed to determine the switching times and switching losses, using different reverse bias VGS voltage levels and different passive RCD (Resistance Capacitor Diode) circuits to interface the driver to the SiC...
This research proposed a WiFi energy harvester for low-power wireless applications. The proposed system harvests energy using three antennas to cover three ISM (Industrial, Scientific, and Medical) channels with central frequencies at 2.412 GHz, 2.439 GHz, and 2.462 GHz. For each channel, a co-planar waveguide antenna is designed to harvest energy from indoor WiFi transmitters. FR4 substrate with...
This paper proposes an electronic system intended to provide a simplified and efficient alternative for plant physiology experiments, as well as to be used in greenhouse conventional processes. The text starts with a description regarding the interaction between artificial lighting and cultivation of vegetables, either for agricultural-oriented purposes or to help the interpretation of plants behavior...
This article discusses common circuit designs for power supplies used in spark erosion machines. The author proposes the use of a linear current source as a generator. Moreover, he presents several solutions of electronic controlled current sources based on an operational amplifier and a power Mosfet transistor. One of the solutions has been selected for further tests, including verification with...
The selection of a bidirectional non-isolated dc-dc converter interfacing the battery and ultracapacitor (UC) in electric vehicles (EVs) is of critical importance for the overall system efficiency. Generally, efficiency comparison of converters is conducted based on given fixed input and output parameters. Such a comparison may not provide fair results for EV applications since energy source voltages...
This article presents a Linear Current Limiter (LCL) specially meant for μ-hybrid vehicles using the Stop-Start function. The LCL limits the current mainly during the start-up of the Internal Combustion Engine (ICE) in order to maintain the battery voltage stable. Its main advantages is the low price and the fact of avoiding EMC perturbation since it is composed of MOSFETs working in linear mode [1]...
Tracking the Maximum Power Point (MPP) of the photovoltaic array is very difficult due to the non linearity of its I–V characteristic which is dependent to the temperature and irradiation conditions. In this paper we propose a new method called sliding mode control (SMC) to maximize the PV array output power. With this method, the PV array output power is used to directly control the dc/dc converter,...
Industry regulations and standards are placing ever increasing limitations on the individual and total harmonic distortion levels that can be injected into the grid and hence an LCL circuit becomes an attractive option to interconnect an inverter to the utility grid. However, despite the benefits of LCL filter in reducing the switching harmonics, the inherent resonance present in this filter can cause...
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