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The dynamic voltage restorer, with its excellent dynamic capabilities, when installed between the supply and a critical load feeder, can compensate for voltage sag/swells, restoring line voltage to its nominal value within few milliseconds and hence avoiding any power disruption to the load. A new topology based on Z-source inverter is presented in order to enhance the voltage restoration property...
The removal of a transformer in grid-connected PV systems can reduce size, weight and costs. When no transformer is used, a galvanic connection between the grid and PV panels exists and leakage current appears due to parasitic capacitance. In this paper, the principle of leakage current is analyzed from equivalent resonant circuit and an equation is derived to evaluate the current. It will be shown...
This paper presents a dual-buck full-bridge inverter (DBFBI) with different inductor structures. All power devices operate at each half line cycle, and the freewheeling current flows through the independent diodes instead of the body diodes of the switches. Shoot-through problem does not exist. However, the DBFBI has four inductors, so the weight and volume of the inverter may be large. In order to...
Based on conventional hysteresis grid-connected inverter current control, a fuzzy hysteresis band width grid connected current control was presented in this paper, and a whole fuzzy hysteresis band width for PV power grid connected current controller has been designed. Simulations were performed on Matlab/Simulink software, results of simulations show that the proposed control algorithm have smaller...
This paper proposes a current control strategy with zero steady-state tracking error for grid-connected boost-inverters. Two boost converters are controlled separately to achieve both output current tracking and balanced output voltages. Based on cascading control and feedback linearization, the inner and outer-loop controllers are derived combining the inversion of boost converter model and the output...
Domestic induction heating is a well-consolidated technology that is evolving in order to obtain new products combining three key aspects: performance, efficiency, and cost. New development tendencies suggest the use of multi-inductor architectures to improve the user performance. These systems require the development of new power converters adapted to the new architectures to achieve an efficient...
This paper presents high performance control algorithms for a 100 kVA three-phase four-wire online voltage regulator. The 100 kVA voltage regulator is composed of a PWM rectifier, a center-tapped DC bus, and an inverter. The rectifier connects with the grid through an LCL filter, providing power factor correction and DC-link voltage regulation. The inverter output power is fed forward to the rectifier...
In this paper, a high gain single-stage buck-boost grid-connected system is proposed. The proposed system consists of a high voltage gain - high efficiency - switched inductor buck-boost converter (SIBBC) and a folded cascade H-bridge inverter. The proposed converter switch is derived with a sinusoidal modulation, so that the converter output voltage is a rectified sine wave which requires only a...
This paper presents a family of high frequency transformer isolated impedance-source (Z-source) inverters and corresponding control method for DC to AC power conversion applications. The original single-stage Z-source inverter incorporates a unique passive impedance network coupled between the inverter main circuit and power source, thus overcoming some conceptual limitations of conventional voltage-fed...
This paper presents a modified small-signal model of a voltage source inverter (VSI) that captures model nonlinearities such as dead time and modulation effects that were not presented in the literature. Previous research has concentrated on developing compensation methods for these types of phenomena in a switching model, but none actually derived an analytical model that can predict them. In this...
A low-cost diagnostic method for the single-phase inverter is proposed in this paper. A low-cost fabricated loop magnetic filed probe is used to detect the magnetic field near the output inductor of the inverter; the measured waveform is utilized as the diagnostic criterion, and is processed by the simple peak detector and comparators. With the proposed circuit, the open-circuit faults of the inverter...
The degree of integration of power electronic converters in current hybrid electric vehicles can be increased by mitigation of special requirements of these converters, especially those regarding ambient air and cooling fluid temperature levels. Today, converters have their own cooling circuit or are placed far away from hot spots caused by the internal combustion engine and its peripheral components...
This paper proposes a general method of sizing the inverter for a PV system. The method evaluates effects of PV incentive policies, inverter efficiency curves, and inverter protection schemes on optimum inverter sizing through system-level cost analysis. Specifically, different scenarios of PV incentives are discussed and compared to show that the optimal inverter size varies notably by location and...
This paper describes a system which is capable of frequency and voltage regulation during load changes on an islanded microgrid. The scaled microgrid model used in this paper consists of a synchronous generator, a solar panel with a single phase inverter, and a varying resistive load. The PV panel is connected to a boost converter which tracks a fraction of the solar panel's maximum power point. This...
This study proposes an islanding detection method for use of grid-connected inverter of distributed renewable generation system. The proposed method is based on two indices: the rate of change of voltage (ROCOV) and the rate of change of frequency (ROCOF). When an inverter is grid-connected, the ROCOV and ROCOF are lower than the threshold values. In contrast, as an islanding occurs, the ROCOV or...
This paper describes this development of a test platform of a grid-connection PV station. Essentially this entire platform involves the integration of a Personal computer (PC), a Dc power source, a power analyzer, an AC load and an analog grid to create a grid-connection PV system and to test. This new system boasts of high accuracy measurements coupled with the commercial viability of low cost. In...
As the aircraft technology is moving towards more electric architecture, use of electric motors in aircraft is increasing. Axial-flux BLDC motors are becoming popular in aero application because of their ability to meet the demand of light weight, high power density, high efficiency and high reliability. Axial-flux BLDC motors in general and ironless axial flux BLDC motors in particular, come with...
This paper deals with a planar inductor design for optimal size reduction of z-source inverters. The smallest possible inductor size is realized through the utilization of the Finite Element method (FEM) and genetic algorithms. Operating condition of the Z-source inverter was set to a point such that it works with a smaller inductance value. We studied the reduction of radiated electromagnetic field...
The use of small inverter-interfaced distributed energy resources for reactive power support is discussed. While the primary function of these resources is to deliver active power, they can also be used to provide reactive power, often identified as an ancillary service by a utility. Given the large and increasing number of small grid-connected inverters, the total reactive power that can be collectively...
In order to improve power reliability of critical load, distributed generation (DG) should be with intentional islanding operation when utility is outage. This paper proposes a novel control strategy for three phase inverter in DG to realize transferring between grid-tied and islanding modes, which is with an inner inductor current loop and outer capacitor voltage loop in the synchronous rotating...
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